WO2021070539A1 - 半導体装置および半導体装置の製造方法 - Google Patents
半導体装置および半導体装置の製造方法 Download PDFInfo
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Definitions
- the present invention relates to a semiconductor device and a manufacturing method.
- Patent Document 1 Patent No. 5374883
- Patent Document 2 WO2017 / 47285
- the doping concentration in a wide range can be easily adjusted in the depth direction of the semiconductor substrate.
- a semiconductor device including a semiconductor substrate having an upper surface and a lower surface.
- the hydrogen chemical concentration distribution in the depth direction of the semiconductor substrate may have a first hydrogen concentration peak and a second hydrogen concentration peak arranged on the lower surface side of the semiconductor substrate with respect to the first hydrogen concentration peak. ..
- the intermediate donor concentration between the first hydrogen concentration peak and the second hydrogen concentration peak is the upper surface side donor concentration between the first hydrogen concentration peak and the upper surface of the semiconductor substrate, and the second hydrogen concentration peak. It may be different from any of the bottom surface side donor concentrations between the semiconductor substrate and the bottom surface.
- the intermediate donor concentration may be higher than either the upper surface side donor concentration or the lower surface side donor concentration.
- the intermediate hydrogen concentration between the first hydrogen concentration peak and the second hydrogen concentration peak is the upper surface hydrogen concentration between the first hydrogen concentration peak and the upper surface of the semiconductor substrate, and the second hydrogen concentration peak. It may be higher than any of the hydrogen concentrations on the lower surface side between the lower surface and the lower surface of the semiconductor substrate.
- the intermediate donor concentration may be 1 ⁇ 10 13 / cm 3 or more and 1 ⁇ 10 15 / cm 3 or less.
- the intermediate donor concentration may be 1.5 times or more of each of the upper surface side donor concentration and the lower surface side donor concentration.
- the hydrogen chemical concentration distribution may have a first upper surface side hem in which the hydrogen concentration decreases from the first hydrogen concentration peak toward the upper surface side.
- the hydrogen chemical concentration distribution may have a first lower surface side hem in which the hydrogen concentration decreases more slowly than the first upper surface side hem from the first hydrogen concentration peak toward the lower surface side.
- the hydrogen chemical concentration distribution may have a second lower surface side hem in which the hydrogen concentration decreases from the second hydrogen concentration peak toward the lower surface side.
- the hydrogen chemical concentration distribution may have a second lower surface side hem in which the hydrogen concentration decreases more slowly than the second lower surface side hem from the second hydrogen concentration peak toward the upper surface side.
- the first hydrogen concentration peak may be higher than the second hydrogen concentration peak.
- the bottom surface donor concentration may be higher than the top surface donor concentration.
- the second hydrogen concentration peak may be higher than the first hydrogen concentration peak.
- the top surface donor concentration may be higher than the bottom surface donor concentration.
- the semiconductor substrate may have a first conductive type drift region.
- the semiconductor substrate may have a trench portion provided on the upper surface of the semiconductor substrate.
- the semiconductor substrate may be provided between the drift region and the lower surface of the semiconductor substrate, and may have a first conductive type buffer region having a higher concentration than the drift region.
- the first hydrogen concentration peak and the second hydrogen concentration peak may be arranged between the lower end of the trench portion and the upper end of the buffer region in the depth direction.
- the intermediate donor concentration between the first hydrogen concentration peak and the second hydrogen concentration peak is the upper surface side donor concentration between the first hydrogen concentration peak and the upper surface of the semiconductor substrate, and the second hydrogen concentration peak. It may be lower than any of the bottom surface side donor concentrations between the semiconductor substrate and the bottom surface.
- Both the first hydrogen concentration peak and the second hydrogen concentration peak may be arranged between the center and the upper surface in the depth direction of the semiconductor substrate.
- the intermediate hydrogen concentration may be 10 times or more the intermediate donor concentration.
- Both the bottom surface donor concentration and the top surface donor concentration may be higher than the bulk donor concentration of the semiconductor substrate.
- the donor concentration distribution in the depth direction of the semiconductor substrate provides a flat portion both between the first hydrogen concentration peak and the upper surface of the semiconductor substrate and between the second hydrogen concentration peak and the lower surface of the semiconductor substrate. May have.
- the donor concentration distribution in the depth direction of the semiconductor substrate may have a flat portion between the first hydrogen concentration peak and the second hydrogen concentration peak.
- the distance between the first hydrogen concentration peak and the second hydrogen concentration peak in the depth direction may be 1/2 or less of the thickness in the depth direction of the semiconductor substrate.
- a method for manufacturing a semiconductor device is provided.
- the manufacturing method is different from the first depth position from the other surface of the upper surface and the lower surface of the semiconductor substrate by injecting hydrogen ions into the first depth position from one surface of the upper surface and the lower surface of the semiconductor substrate.
- a hydrogen injection step may be provided in which hydrogen ions are injected at a second depth position.
- the manufacturing method may include a heat treatment step of heat-treating the semiconductor substrate.
- the second depth position may be arranged between the first depth position and one surface.
- the second depth position may be arranged between the first depth position and the other surface.
- the semiconductor substrate may have a first conductive type drift region.
- the semiconductor substrate may have a trench portion provided on the upper surface of the semiconductor substrate.
- the semiconductor substrate may be provided between the drift region and the lower surface of the semiconductor substrate, and may have a first conductive type buffer region having a higher concentration than the drift region.
- the first depth position and the second depth position may be arranged between the lower end of the trench portion and the upper end of the buffer region in the depth direction.
- the manufacturing method may include a laser annealing step of laser annealing at least one of the upper surface and the lower surface of the semiconductor substrate.
- the hydrogen injection step may be performed after the laser annealing step.
- FIG. 1 It is sectional drawing which shows an example of the semiconductor device 100.
- the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG. 1 are shown. It is a figure explaining the flat part 150 in a density distribution.
- Other examples of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG. 1 are shown.
- Other examples of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG. 1 are shown.
- Other examples of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG. 1 are shown.
- Other examples of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG. 1 are shown.
- FIG. 1 Other examples of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG. 1 are shown.
- It is a top view which shows an example of a semiconductor device 100. It is an enlarged view of the area C in FIG. It is a figure which shows an example of the bb cross section in FIG. It is a figure which shows another example of the passage area 106-1 and the passage area 106-2. It is a figure which shows an example of the doping concentration distribution on the DD line in FIG. It is a figure which shows an example of the hydrogen chemical concentration distribution and the donor concentration distribution in the region near the depth position Z1 and the depth position Z2 shown in FIG. It is a figure which shows an example of the manufacturing method of the semiconductor device 100 described with FIG. 1 to FIG.
- one side in the direction parallel to the depth direction of the semiconductor substrate is referred to as "upper” and the other side is referred to as “lower”.
- the upper surface is referred to as the upper surface and the other surface is referred to as the lower surface.
- the “up” and “down” directions are not limited to the direction of gravity or the direction when the semiconductor device is mounted.
- orthogonal coordinate axes of the X-axis, the Y-axis, and the Z-axis only specify the relative positions of the components and do not limit the specific direction.
- the Z axis does not limit the height direction with respect to the ground.
- the + Z-axis direction and the ⁇ Z-axis direction are opposite to each other. When the positive and negative directions are not described and the Z-axis direction is described, it means the direction parallel to the + Z-axis and the -Z-axis.
- the orthogonal axes parallel to the upper surface and the lower surface of the semiconductor substrate are defined as the X axis and the Y axis. Further, the axis perpendicular to the upper surface and the lower surface of the semiconductor substrate is defined as the Z axis.
- the direction of the Z axis may be referred to as a depth direction. Further, in the present specification, the direction parallel to the upper surface and the lower surface of the semiconductor substrate including the X-axis and the Y-axis may be referred to as a horizontal direction.
- error When referred to as “same” or “equal” in the present specification, it may include a case where there is an error due to manufacturing variation or the like.
- the error is, for example, within 10%.
- the conductive type of the doping region doped with impurities is described as P type or N type.
- an impurity may mean, in particular, either an N-type donor or a P-type acceptor, and may be referred to as a dopant.
- doping means that a donor or acceptor is introduced into a semiconductor substrate to obtain a semiconductor exhibiting an N-type conductive type or a semiconductor exhibiting a P-type conductive type.
- the doping concentration means the concentration of a donor or the concentration of an acceptor in a thermal equilibrium state.
- the net doping concentration means the net concentration of the donor concentration as the concentration of positive ions and the acceptor concentration as the concentration of negative ions, including the polarity of the charge.
- the donor concentration N D, the acceptor concentration and N A, the net doping concentration of the net at any position is N D -N A.
- the net doping concentration may be simply referred to as a doping concentration.
- the donor has the function of supplying electrons to the semiconductor.
- the acceptor has a function of receiving electrons from a semiconductor.
- Donors and acceptors are not limited to the impurities themselves.
- a VOH defect in which pores (V), oxygen (O) and hydrogen (H) are bonded in a semiconductor functions as a donor that supplies electrons.
- VOH defects are sometimes referred to herein as hydrogen donors.
- the description of P + type or N + type means that the doping concentration is higher than that of P type or N type
- the description of P-type or N-type means that the doping concentration is higher than that of P type or N type. It means that the concentration is low.
- the doping concentration is higher than that of P ++ type or N + type.
- the chemical concentration refers to the atomic density of impurities measured regardless of the state of electrical activation.
- the chemical concentration can be measured, for example, by secondary ion mass spectrometry (SIMS).
- the net doping concentration described above can be measured by a voltage-capacity measurement method (CV method).
- the carrier concentration measured by the spread resistance measurement method (SR method) may be used as the net doping concentration.
- the carrier concentration measured by the CV method or the SR method may be a value in a thermal equilibrium state.
- the donor concentration is sufficiently higher than the acceptor concentration, so that the carrier concentration in the region may be used as the donor concentration.
- the carrier concentration in the region may be used as the acceptor concentration.
- the doping concentration in the N-type region may be referred to as the donor concentration
- the doping concentration in the P-type region may be referred to as the acceptor concentration.
- the peak value may be used as the concentration of donor, acceptor or net doping in the region.
- the concentration of donor, acceptor or net doping is substantially uniform, the average value of the concentration of donor, acceptor or net doping in the region may be used as the concentration of donor, acceptor or net doping.
- the carrier concentration measured by the SR method may be lower than the concentration of the donor or acceptor.
- the carrier mobility of the semiconductor substrate may be lower than the value in the crystalline state. The decrease in carrier mobility occurs when carriers are scattered due to disorder of the crystal structure due to lattice defects or the like.
- the concentration of the donor or acceptor calculated from the carrier concentration measured by the CV method or the SR method may be lower than the chemical concentration of the element indicating the donor or acceptor.
- the donor concentration of phosphorus or arsenic as a donor in a silicon semiconductor, or the acceptor concentration of boron (boron) as an acceptor is about 99% of these chemical concentrations.
- the donor concentration of hydrogen as a donor in a silicon semiconductor is about 0.1% to 10% of the chemical concentration of hydrogen.
- FIG. 1 is a cross-sectional view showing an example of the semiconductor device 100.
- the semiconductor device 100 includes a semiconductor substrate 10.
- the semiconductor substrate 10 is a substrate made of a semiconductor material.
- the semiconductor substrate 10 is a silicon substrate.
- At least one of a transistor element such as an insulated gate bipolar transistor (IGBT) and a diode element such as a freewheeling diode (FWD) is formed on the semiconductor substrate 10.
- a transistor element such as an insulated gate bipolar transistor (IGBT) and a diode element such as a freewheeling diode (FWD) is formed on the semiconductor substrate 10.
- IGBT insulated gate bipolar transistor
- FWD freewheeling diode
- N-type bulk donors are distributed throughout.
- the bulk donor is a donor due to the dopant contained in the ingot substantially uniformly during the production of the ingot that is the source of the semiconductor substrate 10.
- the bulk donor in this example is an element other than hydrogen.
- Bulk donor dopants are, but are not limited to, for example phosphorus, antimony, arsenic, selenium or sulfur.
- the bulk donor in this example is phosphorus.
- Bulk donors are also included in the P-type region.
- the semiconductor substrate 10 may be a wafer cut out from a semiconductor ingot, or may be a chip obtained by fragmenting the wafer.
- the semiconductor ingot may be manufactured by any one of a Czochralski method (CZ method), a magnetic field application type Czochralski method (MCZ method), and a float zone method (FZ method).
- CZ method Czochralski method
- MCZ method magnetic field application type Czochralski method
- FZ method float zone method
- the ingot in this example is manufactured by the MCZ method.
- the bulk donor concentration may use the chemical concentration of the bulk donor distributed throughout the semiconductor substrate 10, and may be a value between 90% and 100% of the chemical concentration.
- the semiconductor substrate 10 has an upper surface 21 and a lower surface 23.
- the upper surface 21 and the lower surface 23 are two main surfaces of the semiconductor substrate 10.
- the orthogonal axes on the plane parallel to the upper surface 21 and the lower surface 23 are the X-axis and the Y-axis
- the axes perpendicular to the upper surface 21 and the lower surface 23 are the Z-axis.
- Hydrogen ions are injected into the semiconductor substrate 10 from the lower surface 23 to the depth position Z1. Further, hydrogen ions are injected into the semiconductor substrate 10 from the upper surface 21 to the depth position Z2. Injecting hydrogen ions into a predetermined depth position means injecting hydrogen ions by accelerating them with acceleration energy corresponding to the depth position. Hydrogen ions are distributed not only at the depth position but also near the depth position. It can also be distributed in the passage region 106 from the injection surface to the depth position.
- the hydrogen chemical concentration distribution in the depth direction of the semiconductor substrate 10 has a first hydrogen concentration peak 101 at the depth position Z1 and a second hydrogen concentration peak 102 at the depth position Z2.
- the hydrogen concentration peak is schematically indicated by a cross.
- the depth position Z1 is arranged between the upper surface 21 and the depth position Z2, but the depth position Z1 may be arranged between the lower surface 23 and the depth position Z2. ..
- the region through which the injected hydrogen ions have passed may be referred to as a passage region.
- the passage region 106-1 between the lower surface 23 and the depth position Z1 and the passage region 106-2 between the upper surface 21 and the depth position Z2 are monoatomic pores (single atom vacancies).
- Lattice defects mainly composed of vacancies such as V) and compound atom vacancies (VV) are formed. Atoms adjacent to vacancies have dangling bonds.
- Lattice defects include interstitial atoms and dislocations, and may also include donors and acceptors in a broad sense.
- lattice defects mainly composed of vacancies are referred to as vacancies-type lattice defects, vacancies-type defects, or Sometimes referred to simply as a lattice defect.
- the crystallinity of the semiconductor substrate 10 may be strongly disturbed due to the formation of many lattice defects by implanting hydrogen ions into the semiconductor substrate 10.
- this disorder of crystallinity may be referred to as disorder.
- oxygen is contained in the entire semiconductor substrate 10.
- the oxygen is intentionally or unintentionally introduced during the manufacture of semiconductor ingots.
- H hydrogen
- V pores
- O oxygen
- the VOH defect acts as an electron-supplying donor.
- VOH defects may be referred to simply as hydrogen donors.
- a hydrogen donor is formed in the hydrogen ion passing region 106.
- the doping concentration of the hydrogen donor is lower than the chemical concentration of hydrogen. Assuming that the ratio of the doping concentration of the hydrogen donor to the chemical concentration of hydrogen is the activation rate, the activation rate may be a value of 0.1% to 30%. In this example, the activation rate is 1% to 5%.
- the donor concentration in the passing region 106 of the semiconductor substrate 10 can be made higher than the bulk donor concentration.
- the semiconductor substrate 10 having a predetermined bulk donor concentration must be prepared according to the characteristics of the element to be formed on the semiconductor substrate 10, particularly the rated voltage or the withstand voltage.
- the semiconductor device 100 shown in FIG. 1 the donor concentration in a predetermined region of the semiconductor substrate 10 can be adjusted by controlling the dose amount and injection depth of hydrogen ions. Therefore, the semiconductor device 100 can be manufactured by using a semiconductor substrate having a bulk donor concentration that does not correspond to the characteristics of the device or the like.
- the dose amount of hydrogen ions can be controlled with relatively high accuracy. Therefore, the concentration of lattice defects generated by injecting hydrogen ions can be controlled with high accuracy, and the donor concentration in the passing region 106 can be controlled with high accuracy.
- the semiconductor device 100 hydrogen ions are injected from both the upper surface 21 and the lower surface 23. Therefore, a wide range of passage regions 106 can be easily formed. In the example of FIG. 1, since a part of the passing region 106-1 and the passing region 106-2 overlap each other, the passing region 106 can be formed over the entire depth direction. It is also conceivable to inject hydrogen ions from one of the upper surface 21 and the lower surface 23 so as to penetrate the semiconductor substrate 10 to form a passing region in the entire semiconductor substrate. On the other hand, according to the semiconductor device 100, since hydrogen ions are injected from both the upper surface 21 and the lower surface 23, the acceleration energy of the hydrogen ions can be reduced as compared with the case where the hydrogen ions penetrate the semiconductor substrate 10. Therefore, damage to the element structure such as the gate insulating film can be reduced.
- FIG. 2 shows the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG.
- the horizontal axis of FIG. 2 indicates the depth position from the lower surface 23, and the vertical axis indicates the hydrogen chemical concentration and the donor concentration per unit volume on the logarithmic axis.
- the donor concentration in FIG. 2 is measured by, for example, the CV method or the SR method.
- the hydrogen chemical concentration in FIG. 2 is, for example, the hydrogen concentration measured by the SIMS method.
- the hydrogen chemical concentration distribution is shown by a broken line, and the donor concentration distribution is shown by a solid line.
- the bulk donor concentration is Db.
- the central position of the semiconductor substrate 10 in the depth direction is Zc.
- the hydrogen chemical concentration distribution has a first hydrogen concentration peak 101 and a second hydrogen concentration peak 102.
- the second hydrogen concentration peak 102 is arranged on the lower surface 23 side of the semiconductor substrate 10 with respect to the first hydrogen concentration peak 101. That is, the second hydrogen concentration peak 102 is arranged between the first hydrogen concentration peak 101 and the lower surface 23.
- Z1 be the position of the first hydrogen concentration peak 101 in the depth direction
- Z2 be the position of the second hydrogen concentration peak 102 in the depth direction.
- the position of the concentration peak is the position where the concentration becomes the maximum value.
- the hydrogen chemical concentration distribution has a first upper surface side hem S1a, a first lower surface side hem S1b, a second upper surface side hem S2a, and a second lower surface side hem S2b.
- the first upper surface side hem S1a is a portion in the hydrogen chemical concentration distribution in which the hydrogen concentration decreases from the first hydrogen concentration peak 101 toward the upper surface 21 side.
- the first lower surface side hem S1b is a portion in the hydrogen chemical concentration distribution in which the hydrogen concentration decreases from the first hydrogen concentration peak 101 toward the lower surface 23 side.
- the second upper surface side hem S2a is a portion in the hydrogen chemical concentration distribution in which the hydrogen concentration decreases from the second hydrogen concentration peak 102 toward the upper surface 21 side.
- the second lower surface side hem S2b is a portion in the hydrogen chemical concentration distribution in which the hydrogen concentration decreases from the second hydrogen concentration peak 102 toward the lower surface 23 side.
- the first hydrogen concentration peak 101 of this example is a concentration peak due to hydrogen injected from the lower surface 23 side.
- hydrogen is also distributed in the passing region between the lower surface 23 and the hydrogen injection position. Therefore, the hydrogen concentration of the first lower surface side hem S1b decreases more slowly than that of the first upper surface side hem S1a. That is, the inclination of the first lower surface side hem S1b is smaller than the inclination of the first upper surface side hem S1a.
- the second hydrogen concentration peak 102 of this example is a concentration peak due to hydrogen injected from the upper surface 21 side.
- hydrogen is also distributed in the passing region between the upper surface 21 and the hydrogen injection position. Therefore, the hydrogen concentration of the second upper surface side hem S2a decreases more slowly than that of the second lower surface side hem S2b. That is, the inclination of the second upper surface side hem S2a is smaller than the inclination of the second lower surface side hem S2b.
- the slope of the tail of the concentration distribution in the present specification the slope of the tail within a predetermined distance from the position of the concentration peak may be used. The predetermined distance may be 5 ⁇ m, 3 ⁇ m, or 1 ⁇ m.
- the predetermined distance may be half the distance between the depth position Z1 and the depth position Z2, or may be 1/4. Further, the inclination of each hem may be the inclination of the hem from the position of the concentration peak to the position where the concentration value becomes half of the peak value.
- the hydrogen concentration distribution between the first hydrogen concentration peak 101 and the second hydrogen concentration peak 102 is defined as the intermediate hydrogen distribution 103.
- the hydrogen chemical concentration of the intermediate hydrogen distribution 103 is defined as the intermediate hydrogen concentration Hc.
- the intermediate hydrogen concentration Hc the minimum value of the hydrogen concentration between the depth positions Z1 and Z2 may be used, or an average value may be used.
- the intermediate hydrogen concentration Hc the average concentration of the flat portion in the intermediate hydrogen distribution 103 may be used.
- the flat portion in the concentration distribution is a portion in which a region in which the concentration is substantially constant is continuous for a predetermined length in the depth direction. The details of the flat portion will be described later.
- the hydrogen concentration distribution between the first hydrogen concentration peak 101 and the upper surface 21 of the semiconductor substrate 10 is defined as the upper surface side hydrogen distribution 104. Further, the hydrogen concentration of the upper surface side hydrogen distribution 104 is defined as the upper surface side hydrogen concentration Hs1. As the hydrogen concentration Hs1 on the upper surface side, the minimum value of the hydrogen concentration between the depth position Z1 and the upper surface 21 may be used, or an average value may be used. As the upper surface side hydrogen concentration Hs1, the average concentration of the flat portion closest to the depth position Z1 among the flat portions in the upper surface side hydrogen distribution 104 may be used.
- the hydrogen concentration distribution between the second hydrogen concentration peak 102 and the lower surface 23 of the semiconductor substrate 10 is defined as the lower surface side hydrogen distribution 105. Further, the hydrogen concentration of the lower surface side hydrogen distribution 105 is defined as the lower surface side hydrogen concentration Hs2.
- the minimum value of the hydrogen concentration between the depth position Z2 and the lower surface 23 may be used, or an average value may be used.
- the average concentration of the flat portion closest to the depth position Z2 among the flat portions in the lower surface side hydrogen distribution 105 may be used.
- the intermediate hydrogen concentration Hc is different from both the upper surface side hydrogen concentration Hs1 and the lower surface side hydrogen concentration Hs2.
- the intermediate hydrogen concentration Hc of this example is higher than both the upper surface side hydrogen concentration Hs1 and the lower surface side hydrogen concentration Hs2.
- the intermediate hydrogen concentration Hc may be 1.5 times or more, 2 times or more, or 5 times or more with respect to both the upper surface side hydrogen concentration Hs1 and the lower surface side hydrogen concentration Hs2. Good.
- the donor concentration distribution has a first donor concentration peak 111 and a second donor concentration peak 112.
- the second donor concentration peak 112 is arranged on the lower surface 23 side of the semiconductor substrate 10 with respect to the first donor concentration peak 111.
- the first donor concentration peak 111 is arranged at the same depth position Z1 as the first hydrogen concentration peak 101.
- the second donor concentration peak 112 is arranged at the same depth position Z2 as the second hydrogen concentration peak 102. Even when the vertices of the other peak are included in the range of the half width of one peak, the two peaks may be arranged at the same depth position.
- the donor concentration distribution has a third upper surface side hem S3a, a third lower surface side hem S3b, a fourth upper surface side hem S4a, and a fourth lower surface side hem S4b.
- the third upper surface side hem S3a is a portion of the donor concentration distribution in which the donor concentration decreases from the first donor concentration peak 111 toward the upper surface 21 side.
- the third lower surface side hem S3b is a portion of the donor concentration distribution in which the donor concentration decreases from the first donor concentration peak 111 toward the lower surface 23 side.
- the fourth upper surface side hem S4a is a portion of the donor concentration distribution in which the donor concentration decreases from the second donor concentration peak 112 toward the upper surface 21 side.
- the fourth lower surface side hem S4b is a portion of the donor concentration distribution in which the donor concentration decreases from the second donor concentration peak 112 toward the lower surface 23 side.
- Each donor concentration peak has a shape similar to the corresponding hydrogen concentration peak.
- the donor concentration of the third lower surface side hem S3b decreases more slowly than that of the third upper surface side hem S3a. That is, the inclination of the third lower surface side hem S3b is smaller than the inclination of the third upper surface side hem S3a.
- the donor concentration of the fourth upper surface side hem S4a decreases more slowly than that of the fourth lower surface side hem S4b. That is, the inclination of the fourth upper surface side hem S4a is smaller than the inclination of the fourth lower surface side hem S4b.
- the donor concentration distribution between the first donor concentration peak 111 and the second donor concentration peak 112 is defined as the intermediate donor concentration 113. Further, the donor concentration of the intermediate donor distribution 113 is defined as the intermediate donor concentration Dc. As the intermediate donor concentration Dc, the minimum value of the donor concentration between the depth positions Z1 and Z2 may be used, or an average value may be used. Further, as the intermediate donor concentration Dc, the average concentration of the flat portion in the intermediate donor distribution 113 may be used.
- the donor concentration distribution between the first donor concentration peak 111 and the upper surface 21 of the semiconductor substrate 10 is defined as the upper surface side donor distribution 114. Further, the donor concentration of the upper surface side donor distribution 114 is defined as the upper surface side donor concentration Ds1. As the top surface side donor concentration Ds1, the minimum value of the donor concentration between the depth position Z1 and the top surface 21 may be used, or an average value may be used. As the top surface side donor concentration Ds1, the average concentration of the flat portion closest to the depth position Z1 among the flat portions in the top surface side donor distribution 114 may be used.
- the donor concentration distribution between the second donor concentration peak 112 and the lower surface 23 of the semiconductor substrate 10 is defined as the lower surface side donor distribution 115. Further, the donor concentration of the lower surface side donor distribution 115 is defined as the lower surface side donor concentration Ds2. As the bottom surface side donor concentration Ds2, the minimum value of the donor concentration between the depth position Z2 and the bottom surface 23 may be used, or an average value may be used. As the bottom surface side donor concentration Ds2, the average concentration of the flat portion closest to the depth position Z2 among the flat portions in the bottom surface side donor distribution 115 may be used.
- the intermediate donor concentration Dc is different from both the upper surface side donor concentration Ds1 and the lower surface side donor concentration Ds2.
- the intermediate donor concentration Dc is higher than both the upper surface side donor concentration Ds1 and the lower surface side donor concentration Ds2.
- the intermediate donor concentration Dc may be 1.5 times or more, 2 times or more, or 5 times or more with respect to both the upper surface side donor concentration Ds1 and the lower surface side donor concentration Ds2. Good.
- the intermediate donor concentration Dc, the upper surface donor concentration Ds1, and the lower surface donor concentration Ds2 are all higher than the bulk donor concentration Db.
- the intermediate donor concentration Dc may be 1 ⁇ 10 13 / cm 3 or more and 1 ⁇ 10 15 / cm 3 or less.
- the intermediate donor concentration Dc may be 5 ⁇ 10 13 / cm 3 or more and may be 1 ⁇ 10 14 / cm 3 or more.
- the intermediate hydrogen concentration Hc may be 10 times or more, 50 times or more, or 100 times or more the intermediate donor concentration Dc.
- the donor concentration can be adjusted over the entire depth direction of the semiconductor substrate 10. Further, since hydrogen ions are injected from both the upper surface 21 and the lower surface 23, damage to the insulating film and the like can be reduced. Further, since the depth positions Z1 and Z2 are made different, it is possible to prevent the peak values of the hydrogen chemical concentration and the donor concentration from becoming too large.
- the hydrogen chemical concentration Hp1 of the first hydrogen concentration peak 101 and the hydrogen chemical concentration Hp2 of the second hydrogen concentration peak 102 may be the same or different.
- the donor concentration Dp1 of the first donor concentration peak 111 and the donor concentration Dp2 of the second donor concentration peak 112 may be the same or different.
- the depth position Z1 is arranged on the upper surface 21 side of the semiconductor substrate 10. Further, the depth position Z2 is arranged on the lower surface 23 side of the semiconductor substrate 10.
- the upper surface 21 side refers to a region between the central Zc of the semiconductor substrate 10 in the depth direction and the upper surface 21.
- the lower surface 23 side refers to a region between the central Zc of the semiconductor substrate 10 in the depth direction and the lower surface 23.
- the central position of the region on the lower surface 23 side of the semiconductor substrate 10 in the depth direction is Zc2.
- the central position in the depth direction of the region on the upper surface 21 side is Zc1.
- the depth position Z1 of this example is arranged between the depth positions Zc and Zc1.
- the depth position Z2 is arranged between the depth positions Zc and Zc2.
- the arrangement of the depth positions Z1 and Z2 is not limited to the example of FIG.
- FIG. 3 is a diagram for explaining the flat portion 150 in the concentration distribution. Although the flat portion 150 in the donor concentration is described in FIG. 3, the same definition may be used for the flat portion in the hydrogen chemical concentration distribution. In FIG. 3, a part of the first donor concentration peak 111 and the upper surface side donor distribution 114 is enlarged.
- the donor concentration in the flat portion 150 is substantially constant in the depth direction.
- the fact that the donor concentration is substantially constant in the depth direction means that, for example, a region in which the difference between the maximum value Dmax and the minimum value Dmin of the donor concentration is within 50% of the maximum value Dmax of the donor concentration is a predetermined length in the depth direction. It may refer to a state in which it is continuous for more than that. The difference may be 30% or less of the maximum value Dmax of the donor concentration in the region, and may be 10% or less.
- the value of the donor concentration distribution may be within ⁇ 50% of the average concentration of the donor concentration distribution, and may be within ⁇ 30% with respect to the average concentration of the donor concentration distribution in a predetermined range in the depth direction. Well, it may be within ⁇ 10%.
- the predetermined length in the depth direction may be 5 ⁇ m, 10 ⁇ m, or 15 ⁇ m.
- the section defined by the two depth positions Zs and Ze is 5 ⁇ m or more, and the difference between the maximum value Dmax and the minimum value Dmin of the donor concentration in the section is the maximum value Dmax of the donor concentration.
- the section is defined as a flat portion 150.
- the flat portion 150 of the top surface side donor distribution 114 has been described.
- the flat portion 150 may be arranged in the lower surface side donor distribution 115, and may be arranged in both the upper surface side donor distribution 114 and the lower surface side donor distribution 115. Further, the flat portion 150 may be arranged in the intermediate donor distribution 113.
- FIG. 4 shows another example of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG.
- the depth position Z1 is arranged between the depth position Zc1 and the upper surface 21, and the depth position Z2 is arranged between the depth position Zc2 and the lower surface 23. That is, the first hydrogen concentration peak 101 and the first donor concentration peak 111 are arranged between the depth position Zc1 and the upper surface 21, and the second hydrogen concentration peak 102 and the second donor concentration peak 112 are located. It is arranged between the depth position Zc2 and the lower surface 23.
- Other configurations are the same as the example shown in FIG.
- a wide region of the intermediate hydrogen distribution 103 and the intermediate donor distribution 113 can be formed. That is, a region having a relatively high donor concentration can be formed widely in the depth direction.
- the first donor concentration peak 111 is made to function as at least a part of the N-type region formed on the upper surface 21 side of the semiconductor substrate 10, and the second donor concentration peak 112 is the lower surface 23 of the semiconductor substrate 10. It is easy to function as at least a part of the N-type region formed on the side.
- the N-shaped region on the upper surface 21 side is, for example, a storage region described later.
- the N-shaped region on the lower surface 23 side is, for example, a buffer region described later.
- FIG. 5 shows another example of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG.
- the depth position Z1 and the depth position Z2 are both arranged on the upper surface 21 side of the semiconductor substrate 10.
- Other configurations are the same as the example shown in FIG.
- the first donor concentration peak 111 and the second donor concentration peak 112 function as at least a part of the N-type region formed on the upper surface 21 side of the semiconductor substrate 10.
- the N-shaped region on the upper surface 21 side is, for example, a storage region described later.
- FIG. 6 shows another example of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG.
- the depth position Z1 and the depth position Z2 are both arranged on the lower surface 23 side of the semiconductor substrate 10.
- Other configurations are the same as the example shown in FIG.
- the first donor concentration peak 111 and the second donor concentration peak 112 function as at least a part of the N-type region formed on the lower surface 23 side of the semiconductor substrate 10.
- the N-shaped region on the lower surface 23 side is, for example, a buffer region described later.
- FIG. 7 shows another example of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG.
- concentration of each peak and each distribution is different.
- the depth position of each peak is the same as any of the embodiments described in FIGS. 2 to 6.
- the hydrogen chemical concentration Hp1 of the first hydrogen concentration peak 101 of this example is higher than the hydrogen chemical concentration Hp2 of the second hydrogen concentration peak 102.
- the donor concentration Dp1 of the first donor concentration peak 111 is higher than the donor concentration Dp2 of the second donor concentration peak 112.
- the dose amount of hydrogen ions from the lower surface 23 is higher than the dose amount of hydrogen ions from the upper surface 21. Therefore, the hydrogen chemical concentration of the lower surface hydrogen distribution 105 is higher than the hydrogen chemical concentration of the upper surface hydrogen distribution 104.
- the hydrogen chemical concentration at a position Zx away from the first hydrogen concentration peak 101 is at a position Zx away from the second hydrogen concentration peak 102 in the upper surface side hydrogen distribution 104. Higher than hydrogen chemical concentration.
- Distance Zx is any distance within the range of each distribution.
- the donor concentration of the lower surface side donor distribution 115 is higher than the donor concentration of the upper surface side donor distribution 114.
- the donor concentration at a position Zx away from the first donor concentration peak 111 is the donor at a position Zx away from the second donor concentration peak 112 in the upper surface side donor distribution 114. Higher than the concentration.
- FIG. 8 shows another example of the hydrogen chemical concentration distribution and the donor concentration distribution in the depth direction at the positions shown by the lines AA in FIG.
- concentration of each peak and each distribution is different.
- the depth position of each peak is the same as any of the embodiments described in FIGS. 2 to 6.
- the hydrogen chemical concentration Hp2 of the second hydrogen concentration peak 102 of this example is higher than the hydrogen chemical concentration Hp1 of the first hydrogen concentration peak 101.
- the donor concentration Dp2 of the second donor concentration peak 112 is higher than the donor concentration Dp1 of the first donor concentration peak 111.
- the dose amount of hydrogen ions from the upper surface 21 is higher than the dose amount of hydrogen ions from the lower surface 23. Therefore, the hydrogen chemical concentration of the upper surface side hydrogen distribution 104 is higher than the hydrogen chemical concentration of the lower surface side hydrogen distribution 105.
- the hydrogen chemical concentration at a position Zx away from the second hydrogen concentration peak 102 is at a position Zx away from the first hydrogen concentration peak 101 in the lower surface side hydrogen distribution 105. Higher than hydrogen chemical concentration.
- the donor concentration of the upper surface side donor distribution 114 is higher than the donor concentration of the lower surface side donor distribution 115.
- the donor concentration at a position Zx away from the second donor concentration peak 112 is the donor concentration at a position Zx away from the first donor concentration peak 111 in the lower surface side donor distribution 115. Higher than the concentration.
- the donor concentration distribution inside the semiconductor substrate 10 can be appropriately adjusted.
- FIG. 9 is a top view showing an example of the semiconductor device 100.
- FIG. 9 shows the positions where each member is projected onto the upper surface of the semiconductor substrate 10. In FIG. 9, only a part of the members of the semiconductor device 100 is shown, and some members are omitted.
- the semiconductor device 100 includes a semiconductor substrate 10.
- the semiconductor substrate 10 may have the hydrogen chemical concentration distribution and the donor concentration distribution of any of the embodiments described in FIGS. 1 to 8. However, the semiconductor substrate 10 may further have other concentration peaks different from the respective concentration peaks described in FIGS. 1 to 8.
- hydrogen ions may be injected to form an N-type region in the semiconductor substrate 10.
- the hydrogen chemical concentration distribution may have a hydrogen concentration peak in addition to the hydrogen concentration peak described in FIGS. 1 to 8.
- an N-type region other than hydrogen such as phosphorus may be injected to form an N-type region in the semiconductor substrate 10.
- the donor concentration distribution may have a donor concentration peak in addition to the donor concentration peak described in FIGS. 1 to 8.
- the semiconductor substrate 10 has an end side 162 in a top view. When simply referred to as a top view in the present specification, it means that the semiconductor substrate 10 is viewed from the top surface side.
- the semiconductor substrate 10 of this example has two sets of end sides 162 facing each other in a top view. In FIG. 9, the X-axis and the Y-axis are parallel to either end 162. The Z axis is perpendicular to the upper surface of the semiconductor substrate 10.
- the semiconductor substrate 10 is provided with an active portion 160.
- the active portion 160 is a region in which a main current flows in the depth direction between the upper surface and the lower surface of the semiconductor substrate 10 when the semiconductor device 100 operates.
- An emitter electrode is provided above the active portion 160, but is omitted in FIG.
- the active unit 160 is provided with at least one of a transistor unit 70 including a transistor element such as an IGBT and a diode unit 80 including a diode element such as a freewheeling diode (FWD).
- a transistor unit 70 including a transistor element such as an IGBT and a diode unit 80 including a diode element such as a freewheeling diode (FWD).
- the transistor portion 70 and the diode portion 80 are alternately arranged along a predetermined arrangement direction (X-axis direction in this example) on the upper surface of the semiconductor substrate 10.
- the active portion 160 may be provided with only one of the transistor portion 70 and the diode portion 80.
- the symbol “I” is attached to the region where the transistor portion 70 is arranged, and the symbol “F” is attached to the region where the diode portion 80 is arranged.
- the direction perpendicular to the arrangement direction in the top view may be referred to as a stretching direction (Y-axis direction in FIG. 9).
- the transistor portion 70 and the diode portion 80 may each have a longitudinal length in the stretching direction. That is, the length of the transistor portion 70 in the Y-axis direction is larger than the width in the X-axis direction. Similarly, the length of the diode portion 80 in the Y-axis direction is larger than the width in the X-axis direction.
- the stretching direction of the transistor portion 70 and the diode portion 80 may be the same as the longitudinal direction of each trench portion described later.
- the diode portion 80 has an N + type cathode region in a region in contact with the lower surface of the semiconductor substrate 10.
- the region provided with the cathode region is referred to as a diode portion 80. That is, the diode portion 80 is a region that overlaps with the cathode region in the top view.
- a P + type collector region may be provided on the lower surface of the semiconductor substrate 10 in a region other than the cathode region.
- the diode portion 80 may also include an extension region 81 in which the diode portion 80 is extended in the Y-axis direction to the gate wiring described later.
- a collector region is provided on the lower surface of the extension region 81.
- the transistor portion 70 has a P + type collector region in a region in contact with the lower surface of the semiconductor substrate 10. Further, in the transistor portion 70, a gate structure having an N-type emitter region, a P-type base region, a gate conductive portion and a gate insulating film is periodically arranged on the upper surface side of the semiconductor substrate 10.
- the semiconductor device 100 may have one or more pads above the semiconductor substrate 10.
- the semiconductor device 100 of this example has a gate pad 164.
- the semiconductor device 100 may have pads such as an anode pad, a cathode pad, and a current detection pad. Each pad is arranged in the vicinity of the edge 162.
- the vicinity of the end side 162 refers to a region between the end side 162 and the emitter electrode in the top view.
- each pad may be connected to an external circuit via wiring such as a wire.
- a gate potential is applied to the gate pad 164.
- the gate pad 164 is electrically connected to the conductive portion of the gate trench portion of the active portion 160.
- the semiconductor device 100 includes a gate wiring that connects the gate pad 164 and the gate trench portion. In FIG. 9, the gate wiring is hatched with diagonal lines.
- the gate wiring of this example has an outer peripheral gate wiring 130 and an active side gate wiring 131.
- the outer peripheral gate wiring 130 is arranged between the active portion 160 and the end side 162 of the semiconductor substrate 10 in a top view.
- the outer peripheral gate wiring 130 of this example surrounds the active portion 160 in a top view.
- the region surrounded by the outer peripheral gate wiring 130 in the top view may be the active portion 160.
- the outer peripheral gate wiring 130 is connected to the gate pad 164.
- the outer peripheral gate wiring 130 is arranged above the semiconductor substrate 10.
- the outer peripheral gate wiring 130 may be a metal wiring containing aluminum or the like.
- the active side gate wiring 131 is provided in the active portion 160. By providing the active side gate wiring 131 in the active portion 160, it is possible to reduce the variation in the wiring length from the gate pad 164 in each region of the semiconductor substrate 10.
- the active side gate wiring 131 is connected to the gate trench portion of the active portion 160.
- the active side gate wiring 131 is arranged above the semiconductor substrate 10.
- the active side gate wiring 131 may be wiring formed of a semiconductor such as polysilicon doped with impurities.
- the active side gate wiring 131 may be connected to the outer peripheral gate wiring 130.
- the active side gate wiring 131 of this example is provided so as to extend in the X-axis direction from one outer peripheral gate wiring 130 to the other outer peripheral gate wiring 130 at substantially the center in the Y-axis direction so as to cross the active portion 160. There is.
- the transistor portion 70 and the diode portion 80 may be alternately arranged in the X-axis direction in each divided region.
- the semiconductor device 100 includes a temperature sense unit (not shown) which is a PN junction diode made of polysilicon or the like, and a current detection unit (not shown) which simulates the operation of a transistor unit provided in the active unit 160. May be good.
- a temperature sense unit (not shown) which is a PN junction diode made of polysilicon or the like
- a current detection unit (not shown) which simulates the operation of a transistor unit provided in the active unit 160. May be good.
- the semiconductor device 100 of this example includes an edge termination structure portion 90 between the active portion 160 and the end side 162 in a top view.
- the edge termination structure 90 of this example is arranged between the outer peripheral gate wiring 130 and the end edge 162.
- the edge termination structure 90 relaxes the electric field concentration on the upper surface side of the semiconductor substrate 10.
- the edge termination structure 90 may include at least one of a guard ring, a field plate and a resurf provided in an annular shape surrounding the active portion 160.
- FIG. 10 is an enlarged view of the region C in FIG.
- the region C is a region including the transistor portion 70, the diode portion 80, and the active side gate wiring 131.
- the semiconductor device 100 of this example includes a gate trench portion 40, a dummy trench portion 30, a well region 11, an emitter region 12, a base region 14, and a contact region 15 provided inside the upper surface side of the semiconductor substrate 10.
- the gate trench portion 40 and the dummy trench portion 30 are examples of trench portions, respectively.
- the semiconductor device 100 of this example includes an emitter electrode 52 and an active side gate wiring 131 provided above the upper surface of the semiconductor substrate 10.
- the emitter electrode 52 and the active side gate wiring 131 are provided separately from each other.
- An interlayer insulating film is provided between the emitter electrode 52 and the active side gate wiring 131 and the upper surface of the semiconductor substrate 10, but this is omitted in FIG.
- a contact hole 54 is provided so as to penetrate the interlayer insulating film.
- each contact hole 54 is hatched with diagonal lines.
- the emitter electrode 52 is provided above the gate trench portion 40, the dummy trench portion 30, the well region 11, the emitter region 12, the base region 14, and the contact region 15.
- the emitter electrode 52 passes through the contact hole 54 and comes into contact with the emitter region 12, the contact region 15, and the base region 14 on the upper surface of the semiconductor substrate 10. Further, the emitter electrode 52 is connected to the dummy conductive portion in the dummy trench portion 30 through a contact hole provided in the interlayer insulating film.
- the emitter electrode 52 may be connected to the dummy conductive portion of the dummy trench portion 30 at the tip of the dummy trench portion 30 in the Y-axis direction.
- the active side gate wiring 131 is connected to the gate trench portion 40 through a contact hole provided in the interlayer insulating film.
- the active side gate wiring 131 may be connected to the gate conductive portion of the gate trench portion 40 at the tip portion 41 of the gate trench portion 40 in the Y-axis direction.
- the active side gate wiring 131 is not connected to the dummy conductive portion in the dummy trench portion 30.
- the emitter electrode 52 is made of a material containing metal. In FIG. 10, the range in which the emitter electrode 52 is provided is shown. For example, at least a part of the emitter electrode 52 is formed of an aluminum or aluminum-silicon alloy, for example, a metal alloy such as AlSi or AlSiCu.
- the emitter electrode 52 may have a barrier metal formed of titanium, a titanium compound, or the like in the lower layer of the region formed of aluminum or the like. Further, the contact hole may have a plug formed by embedding tungsten or the like so as to be in contact with the barrier metal and aluminum or the like.
- the well region 11 is provided so as to overlap the active side gate wiring 131.
- the well region 11 is extended to a predetermined width so as not to overlap with the active side gate wiring 131.
- the well region 11 of this example is provided away from the end of the contact hole 54 in the Y-axis direction on the active side gate wiring 131 side.
- the well region 11 is a second conductive type region having a higher doping concentration than the base region 14.
- the base region 14 of this example is P-type, and the well region 11 is P + type.
- Each of the transistor portion 70 and the diode portion 80 has a plurality of trench portions arranged in the arrangement direction.
- the transistor portion 70 of this example one or more gate trench portions 40 and one or more dummy trench portions 30 are alternately provided along the arrangement direction.
- the diode portion 80 of this example is provided with a plurality of dummy trench portions 30 along the arrangement direction.
- the diode portion 80 of this example is not provided with the gate trench portion 40.
- the gate trench portion 40 of this example connects two straight portions 39 (portions that are linear along the stretching direction) and two straight portions 39 that extend along the stretching direction perpendicular to the arrangement direction. It may have a tip 41.
- the stretching direction in FIG. 10 is the Y-axis direction.
- the tip portion 41 is provided in a curved shape in a top view.
- the dummy trench portion 30 is provided between the straight portions 39 of the gate trench portion 40.
- One dummy trench portion 30 may be provided between the straight portions 39, and a plurality of dummy trench portions 30 may be provided.
- the dummy trench portion 30 may have a linear shape extending in the stretching direction, and may have a straight portion 29 and a tip portion 31 as in the gate trench portion 40.
- the semiconductor device 100 shown in FIG. 10 includes both a linear dummy trench portion 30 having no tip portion 31 and a dummy trench portion 30 having a tip portion 31.
- the diffusion depth of the well region 11 may be deeper than the depth of the gate trench portion 40 and the dummy trench portion 30.
- the ends of the gate trench portion 40 and the dummy trench portion 30 in the Y-axis direction are provided in the well region 11 in the top view. That is, at the end of each trench in the Y-axis direction, the bottom of each trench in the depth direction is covered with the well region 11. Thereby, the electric field concentration at the bottom of each trench can be relaxed.
- a mesa part is provided between each trench part in the arrangement direction.
- the mesa portion refers to a region sandwiched between trench portions inside the semiconductor substrate 10.
- the upper end of the mesa portion is the upper surface of the semiconductor substrate 10.
- the depth position of the lower end of the mesa portion is the same as the depth position of the lower end of the trench portion.
- the mesa portion of this example is provided on the upper surface of the semiconductor substrate 10 by extending in the stretching direction (Y-axis direction) along the trench.
- the transistor portion 70 is provided with a mesa portion 60
- the diode portion 80 is provided with a mesa portion 61.
- a mesa portion when simply referred to as a mesa portion in the present specification, it refers to each of the mesa portion 60 and the mesa portion 61.
- a base region 14 is provided in each mesa section. Of the base region 14 exposed on the upper surface of the semiconductor substrate 10 in the mesa portion, the region closest to the active side gate wiring 131 is referred to as the base region 14-e. In FIG. 10, the base region 14-e arranged at one end in the extending direction of each mesa portion is shown, but the base region 14-e is also arranged at the other end of each mesa portion. Has been done.
- Each mesa portion may be provided with at least one of a first conductive type emitter region 12 and a second conductive type contact region 15 in a region sandwiched between base regions 14-e in a top view.
- the emitter region 12 of this example is N + type
- the contact region 15 is P + type.
- the emitter region 12 and the contact region 15 may be provided between the base region 14 and the upper surface of the semiconductor substrate 10 in the depth direction.
- the mesa portion 60 of the transistor portion 70 has an emitter region 12 exposed on the upper surface of the semiconductor substrate 10.
- the emitter region 12 is provided in contact with the gate trench portion 40.
- the mesa portion 60 in contact with the gate trench portion 40 may be provided with an exposed contact region 15 on the upper surface of the semiconductor substrate 10.
- Each of the contact region 15 and the emitter region 12 in the mesa portion 60 is provided from one trench portion in the X-axis direction to the other trench portion.
- the contact region 15 and the emitter region 12 of the mesa portion 60 are alternately arranged along the stretching direction (Y-axis direction) of the trench portion.
- the contact region 15 and the emitter region 12 of the mesa portion 60 may be provided in a stripe shape along the extending direction (Y-axis direction) of the trench portion.
- an emitter region 12 is provided in a region in contact with the trench portion, and a contact region 15 is provided in a region sandwiched between the emitter regions 12.
- the emitter region 12 is not provided in the mesa portion 61 of the diode portion 80.
- a base region 14 and a contact region 15 may be provided on the upper surface of the mesa portion 61.
- a contact region 15 may be provided in contact with the respective base regions 14-e in the region sandwiched between the base regions 14-e on the upper surface of the mesa portion 61.
- a base region 14 may be provided in a region sandwiched between the contact regions 15 on the upper surface of the mesa portion 61.
- the base region 14 may be arranged over the entire region sandwiched between the contact regions 15.
- a contact hole 54 is provided above each mesa portion.
- the contact hole 54 is arranged in a region sandwiched between the base regions 14-e.
- the contact hole 54 of this example is provided above each region of the contact region 15, the base region 14, and the emitter region 12.
- the contact hole 54 is not provided in the region corresponding to the base region 14-e and the well region 11.
- the contact hole 54 may be arranged at the center of the mesa portion 60 in the arrangement direction (X-axis direction).
- an N + type cathode region 82 is provided in a region adjacent to the lower surface of the semiconductor substrate 10.
- a P + type collector region 22 may be provided on the lower surface of the semiconductor substrate 10 in a region where the cathode region 82 is not provided.
- the cathode region 82 and the collector region 22 are provided between the lower surface 23 of the semiconductor substrate 10 and the buffer region 20. In FIG. 10, the boundary between the cathode region 82 and the collector region 22 is shown by a dotted line.
- the cathode region 82 is arranged away from the well region 11 in the Y-axis direction.
- the pressure resistance can be improved by securing the distance between the P-shaped region (well region 11) formed to a deep position and having a relatively high doping concentration and the cathode region 82.
- the end portion of the cathode region 82 of this example in the Y-axis direction is arranged farther from the well region 11 than the end portion of the contact hole 54 in the Y-axis direction.
- the end of the cathode region 82 in the Y-axis direction may be located between the well region 11 and the contact hole 54.
- FIG. 11 is a diagram showing an example of a bb cross section in FIG.
- the bb cross section is an XZ plane passing through the emitter region 12 and the cathode region 82.
- the semiconductor device 100 of this example has a semiconductor substrate 10, an interlayer insulating film 38, an emitter electrode 52, and a collector electrode 24 in the cross section.
- the interlayer insulating film 38 is provided on the upper surface of the semiconductor substrate 10.
- the interlayer insulating film 38 is a film containing at least one layer of an insulating film such as silicate glass to which impurities such as boron and phosphorus are added, a thermal oxide film, and other insulating films.
- the interlayer insulating film 38 is provided with the contact hole 54 described in FIG.
- the emitter electrode 52 is provided above the interlayer insulating film 38.
- the emitter electrode 52 is in contact with the upper surface 21 of the semiconductor substrate 10 through the contact hole 54 of the interlayer insulating film 38.
- the collector electrode 24 is provided on the lower surface 23 of the semiconductor substrate 10.
- the emitter electrode 52 and the collector electrode 24 are made of a metal material such as aluminum.
- the direction (Z-axis direction) connecting the emitter electrode 52 and the collector electrode 24 is referred to as a depth direction.
- the semiconductor substrate 10 has an N-type or N-type drift region 18.
- the drift region 18 is provided in each of the transistor portion 70 and the diode portion 80.
- the mesa portion 60 of the transistor portion 70 is provided with an N + type emitter region 12 and a P-type base region 14 in order from the upper surface 21 side of the semiconductor substrate 10.
- a drift region 18 is provided below the base region 14.
- the mesa portion 60 may be provided with an N + type storage region 16.
- the storage region 16 is arranged between the base region 14 and the drift region 18.
- the emitter region 12 is exposed on the upper surface 21 of the semiconductor substrate 10 and is provided in contact with the gate trench portion 40.
- the emitter region 12 may be in contact with the trench portions on both sides of the mesa portion 60.
- the emitter region 12 has a higher doping concentration than the drift region 18.
- the base region 14 is provided below the emitter region 12.
- the base region 14 of this example is provided in contact with the emitter region 12.
- the base region 14 may be in contact with the trench portions on both sides of the mesa portion 60.
- the storage area 16 is provided below the base area 14.
- the accumulation region 16 is an N + type region having a higher doping concentration than the drift region 18.
- IE effect carrier injection promoting effect
- the storage region 16 may be provided so as to cover the entire lower surface of the base region 14 in each mesa portion 60.
- the mesa portion 61 of the diode portion 80 is provided with a P-type base region 14 in contact with the upper surface 21 of the semiconductor substrate 10.
- a drift region 18 is provided below the base region 14.
- the accumulation region 16 may be provided below the base region 14.
- an N + type buffer region 20 may be provided below the drift region 18.
- the doping concentration in the buffer region 20 is higher than the doping concentration in the drift region 18.
- the buffer region 20 has a concentration peak 25 having a higher doping concentration than the drift region 18.
- the doping concentration of the concentration peak 25 refers to the doping concentration at the apex of the concentration peak 25.
- the average value of the doping concentrations in the region where the doping concentration distribution is substantially flat may be used as the doping concentration in the drift region 18, the average value of the doping concentrations in the region where the doping concentration distribution is substantially flat may be used.
- the doping concentration of the drift region 18 may be the average value of the doping concentration of the flat portion 150 described in FIG.
- the buffer region 20 of this example has three or more concentration peaks 25 in the depth direction (Z-axis direction) of the semiconductor substrate 10.
- the concentration peak 25 of the buffer region 20 may be provided at the same depth position as the concentration peak of hydrogen (proton) or phosphorus, for example.
- the buffer region 20 may function as a field stop layer that prevents the depletion layer extending from the lower end of the base region 14 from reaching the P + type collector region 22 and the N + type cathode region 82.
- a P + type collector region 22 is provided below the buffer region 20.
- the acceptor concentration in the collector region 22 is higher than the acceptor concentration in the base region 14.
- the collector region 22 may include the same acceptors as the base region 14, or may include different acceptors.
- the acceptor of the collector region 22 is, for example, boron.
- an N + type cathode region 82 is provided below the buffer region 20.
- the donor concentration in the cathode region 82 is higher than the donor concentration in the drift region 18.
- the donor of the cathode region 82 is, for example, hydrogen or phosphorus.
- the elements that serve as donors and acceptors in each region are not limited to the above-mentioned examples.
- the collector region 22 and the cathode region 82 are exposed on the lower surface 23 of the semiconductor substrate 10 and are connected to the collector electrode 24.
- the collector electrode 24 may come into contact with the entire lower surface 23 of the semiconductor substrate 10.
- the emitter electrode 52 and the collector electrode 24 are made of a metal material such as aluminum.
- One or more gate trench portions 40 and one or more dummy trench portions 30 are provided on the upper surface 21 side of the semiconductor substrate 10. Each trench portion penetrates the base region 14 from the upper surface 21 of the semiconductor substrate 10 and reaches the drift region 18. In the region where at least one of the emitter region 12, the contact region 15 and the storage region 16 is provided, each trench portion also penetrates these doping regions and reaches the drift region 18. The penetration of the trench portion through the doping region is not limited to those manufactured in the order of forming the doping region and then forming the trench portion. Those in which a doping region is formed between the trench portions after the trench portion is formed are also included in those in which the trench portion penetrates the doping region.
- the transistor portion 70 is provided with a gate trench portion 40 and a dummy trench portion 30.
- the diode portion 80 is provided with a dummy trench portion 30 and is not provided with a gate trench portion 40.
- the boundary between the diode portion 80 and the transistor portion 70 in the X-axis direction is the boundary between the cathode region 82 and the collector region 22.
- the gate trench portion 40 has a gate trench, a gate insulating film 42, and a gate conductive portion 44 provided on the upper surface 21 of the semiconductor substrate 10.
- the gate insulating film 42 is provided so as to cover the inner wall of the gate trench.
- the gate insulating film 42 may be formed by oxidizing or nitriding the semiconductor on the inner wall of the gate trench.
- the gate conductive portion 44 is provided inside the gate trench and inside the gate insulating film 42. That is, the gate insulating film 42 insulates the gate conductive portion 44 and the semiconductor substrate 10.
- the gate conductive portion 44 is formed of a conductive material such as polysilicon.
- the gate conductive portion 44 may be provided longer than the base region 14 in the depth direction.
- the gate trench portion 40 in the cross section is covered with an interlayer insulating film 38 on the upper surface 21 of the semiconductor substrate 10.
- the gate conductive portion 44 is electrically connected to the gate wiring. When a predetermined gate voltage is applied to the gate conductive portion 44, a channel due to an electron inversion layer is formed on the surface layer of the interface of the base region 14 in contact with the gate trench portion 40.
- the dummy trench portion 30 may have the same structure as the gate trench portion 40 in the cross section.
- the dummy trench portion 30 has a dummy trench, a dummy insulating film 32, and a dummy conductive portion 34 provided on the upper surface 21 of the semiconductor substrate 10.
- the dummy conductive portion 34 is electrically connected to the emitter electrode 52.
- the dummy insulating film 32 is provided so as to cover the inner wall of the dummy trench.
- the dummy conductive portion 34 is provided inside the dummy trench and inside the dummy insulating film 32.
- the dummy insulating film 32 insulates the dummy conductive portion 34 and the semiconductor substrate 10.
- the dummy conductive portion 34 may be formed of the same material as the gate conductive portion 44.
- the dummy conductive portion 34 is formed of a conductive material such as polysilicon.
- the dummy conductive portion 34 may have the same length as the gate conductive portion 44 in the depth direction.
- the gate trench portion 40 and the dummy trench portion 30 of this example are covered with an interlayer insulating film 38 on the upper surface 21 of the semiconductor substrate 10.
- the bottom of the dummy trench portion 30 and the gate trench portion 40 may be curved downward (curved in cross section).
- the semiconductor substrate 10 has a first hydrogen concentration peak 101 and a first donor concentration peak 111 at the depth position Z1, and a second hydrogen concentration at the depth position Z2. It has a peak 102 and a second donor concentration peak 112.
- the depth position Z1 may be arranged in the storage area 16, may be arranged between the lower end position Zt of the trench portion and the upper end position Zf of the buffer area 20, and may be arranged in the buffer area 20. Good.
- the depth position Z2 may be arranged in the storage area 16, may be arranged between the lower end position Zt of the trench portion and the upper end position Zf of the buffer area 20, and may be arranged in the buffer area 20. You may.
- FIG. 12 is a diagram showing other examples of the passing area 106-1 and the passing area 106-2.
- the passing area 106-1 and the passing area 106-2 of this example do not overlap. That is, the passing area 106-1 and the passing area 106-2 are arranged apart from each other in the depth direction.
- hydrogen ions are injected into the depth position Z1 of the semiconductor substrate 10 from the upper surface 21 side of the semiconductor substrate 10. Further, hydrogen ions are injected from the lower surface 23 side of the semiconductor substrate 10 into the depth position Z2 on the lower surface 23 side of the depth position Z1.
- the depth positions Z1 and Z2 of this example are arranged between the lower end position Zt of the trench portion and the upper end position Zf of the buffer region 20.
- FIG. 13 is a diagram showing an example of the doping concentration distribution on the DD line in FIG. In this example, in addition to the donor concentration distribution due to VOH defects, the doping concentration distribution in each region is shown.
- the emitter region 12 contains an N-type dopant such as phosphorus.
- the base region 14 contains a P-type dopant such as boron.
- the storage region 16 contains an N-type dopant such as phosphorus or hydrogen.
- the drift region 18 contains hydrogen in at least a part of the region.
- a first donor concentration peak 111 and a second donor concentration peak 112 are arranged in the drift region 18.
- the buffer region 20 of this example has a plurality of concentration peaks 25-1, 25-2, 25-3, and 25-4 in the doping concentration distribution. Each concentration peak 25 is formed by injecting hydrogen ions.
- the collector region 22 contains a P-type dopant such as boron.
- FIG. 14 is a diagram showing an example of the hydrogen chemical concentration distribution and the donor concentration distribution in the region near the depth position Z1 and the depth position Z2 shown in FIG.
- hydrogen does not pass through the region between the depth position Z1 and the depth position Z2. Therefore, VOH defects are not formed in the region.
- VOH defects are formed in the region between the depth position Z1 and the upper surface 21 and the region between the depth position Z2 and the lower surface 23.
- the intermediate donor concentration Dc in the intermediate donor distribution 113 between the depth position Z1 and the depth position Z2 is the upper surface donor concentration Ds1 in the upper surface donor distribution 114 and the lower surface donor in the lower surface donor distribution 115. It is lower than any of the concentrations Ds2.
- the intermediate donor concentration Dc may be the same as the bulk donor concentration Db. Both the top surface side donor concentration Ds1 and the bottom surface side donor concentration Ds2 are higher than the bulk donor concentration Db.
- the upper surface side donor concentration Ds1 and the lower surface side donor concentration Ds2 may be twice or more, three times or more, or five times or more the intermediate donor concentration Dc.
- the depth position Z1 and the depth position Z2 may be arranged in the same manner as in the examples shown in FIGS. 2 to 8.
- the depth positions Z1 and Z2 are preferably arranged between the depth positions Zt and Zf.
- both the first hydrogen concentration peak 101 and the second hydrogen concentration peak 102 may be arranged on the upper surface 21 side of the semiconductor substrate 10.
- the region of the intermediate donor distribution 113 having a relatively low donor concentration can be arranged on the upper surface 21 side of the semiconductor substrate 10.
- the electric field may easily concentrate on the upper surface 21 side. Even in such a case, by arranging the intermediate donor distribution 113 on the upper surface 21 side, the electric field concentration on the upper surface 21 side can be relaxed.
- the distance between the depth positions Z1 and Z2 in the depth direction may be 1/2 or less of the thickness of the semiconductor substrate 10 in the depth direction.
- the distance may be 1/4 or less of the thickness and may be 1/10 or less.
- the donor concentration of the semiconductor substrate 10 can be adjusted in a wide range in the depth direction.
- FIG. 15 is a diagram showing an example of a manufacturing method of the semiconductor device 100 described with reference to FIGS. 1 to 14.
- the manufacturing method consists of an upper surface injection step of injecting hydrogen ions from the upper surface 21 of the semiconductor substrate 10 to the first depth position and a second depth position different from the first depth position from the lower surface 23 of the semiconductor substrate. It includes a hydrogen injection stage including a bottom surface injection stage for injecting hydrogen ions.
- the bottom surface injection step is step S1408.
- the top injection step is one of steps S1412, S1413, S1414, S1415.
- the first depth position is one of the depth positions Z1 and Z2, and the second depth position is the other of the depth positions Z1 and Z2.
- the upper surface structure of the semiconductor device 100 is formed in step S1400.
- the upper surface structure refers to a structure provided on the upper surface 21 side of the semiconductor substrate 10, and includes, for example, a trench portion, an emitter region 12, a base region 14, a storage region 16, an interlayer insulating film 38, an emitter electrode 52, a gate wiring, and the like.
- step S1402 the lower surface 23 side of the semiconductor substrate 10 is ground to adjust the thickness of the semiconductor substrate 10.
- step S1412 hydrogen ions may be injected from the upper surface 21 side of the semiconductor substrate 10. However, the injection of hydrogen ions from the upper surface 21 side may be performed at another timing described later.
- step S1412 hydrogen ions are injected into one of the depth positions Z1 or the depth position Z2.
- the depth position Z2 may be arranged between the depth position Z1 and the lower surface 23.
- hydrogen ions are injected from the upper surface 21 to the depth position Z2 in step S1412. Further, in the example of FIGS. 12 to 14, hydrogen ions are injected from the upper surface 21 to the depth position Z1 in the step S1412.
- step S1404 the P-type dopant is injected into the collector region 22.
- step S1404 the N-type dopant may also be injected into the cathode region 82.
- step S1413 hydrogen ions may be injected from the upper surface 21 side of the semiconductor substrate 10. Step S1413 is similar to step S1412. When performing step S1413, step S1412 does not have to be performed.
- step S1406 the region near the lower surface 23 is irradiated with a laser and laser annealed. As a result, the cathode region 82 and the collector region 22 are formed.
- step S1412 or step S1413 is performed prior to step S1406, laser annealing in step S1406 can recover the excess defects formed by hydrogen ion implantation.
- step S1412 or step S1413 when hydrogen ions are injected into the region from the upper surface 21 to the lower surface 23 side, the acceleration energy of the hydrogen ions becomes high, so that excessive defects are likely to be formed. In this case, step S1406 can recover the excess defect in the vicinity of the lower surface 23.
- step S1414 hydrogen ions may be injected from the upper surface 21 side of the semiconductor substrate 10.
- Step S1414 is similar to step S1412. When performing step S1413, steps S1412 and S1413 need not be performed.
- step S1408 hydrogen ions are injected from the lower surface 23 side.
- step S1408 hydrogen ions are injected from the lower surface 23 to one depth position of the depth position Z1 or the depth position Z2. As described above, the depth position for injecting hydrogen ions from the upper surface 21 side and the depth position for injecting hydrogen ions from the lower surface 23 side are different.
- step S1408 hydrogen ions are injected from the lower surface 23 to the depth position Z1. Further, in the example of FIGS. 12 to 14, hydrogen ions are injected from the lower surface 23 to the depth position Z2 in the step S1408.
- step S1415 hydrogen ions may be injected from the upper surface 21 side of the semiconductor substrate 10.
- Step S1415 is the same as step S1412.
- step S1412 step S1413 and step S1414 need not be performed.
- step S1414 or step S1415 after step S1406 it is possible to prevent the vacancy defects formed in step S1414 or step S1415 near the lower surface 23 from being excessively recovered by laser annealing. Therefore, the donor concentration of the semiconductor substrate 10 can be controlled with high accuracy.
- step S1410 the entire semiconductor substrate 10 may be heat-treated by an annealing furnace. This diffuses hydrogen and promotes the formation of VOH defects.
- the heat treatment temperature in step S1410 may be 350 ° C. or higher and 380 ° C. or lower.
- the upper limit of the heat treatment temperature may be 360 ° C. or lower.
- step S1410 a structure such as a collector electrode 24 is formed. As a result, the semiconductor device 100 can be manufactured.
- the heat treatment step shown in step S1410 may be performed twice, after injecting hydrogen from one of the upper surface 21 and the lower surface 23 and after injecting hydrogen from the other of the upper surface 21 and the lower surface 23.
- the step of injecting hydrogen from the upper surface 21 and the step of injecting hydrogen from the lower surface 23 may be performed first with the higher hydrogen acceleration energy.
- the heat treatment may be performed each time each hydrogen is injected. More specifically, the temperature of the first heat treatment step after performing the hydrogen injection step having the higher acceleration energy is higher than the temperature of the second heat treatment step after performing the hydrogen injection step having the lower acceleration energy. It can be expensive.
- the temperature of the first heat treatment step may be 360 ° C. or higher and 380 ° C. or lower.
- the temperature of the second heat treatment step may be less than 360 ° C. Since pore defects are more likely to be formed when the acceleration energy is higher, VOH defects can be efficiently formed by raising the heat treatment temperature in the first heat treatment step.
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Abstract
Description
特許文献1 特許第5374883号
特許文献2 WO2017/47285号
Claims (19)
- 上面および下面を有する半導体基板を備え、
前記半導体基板の深さ方向における水素化学濃度分布が、第1の水素濃度ピークと、前記第1の水素濃度ピークよりも前記半導体基板の前記下面側に配置された第2の水素濃度ピークとを有し、
前記第1の水素濃度ピークと前記第2の水素濃度ピークとの間の中間ドナー濃度が、前記第1の水素濃度ピークと前記半導体基板の前記上面との間の上面側ドナー濃度と、前記第2の水素濃度ピークと前記半導体基板の前記下面との間の下面側ドナー濃度のいずれとも異なる
半導体装置。 - 前記中間ドナー濃度が、前記上面側ドナー濃度および前記下面側ドナー濃度のいずれよりも高い
請求項1に記載の半導体装置。 - 前記第1の水素濃度ピークと前記第2の水素濃度ピークとの間の中間水素濃度が、前記第1の水素濃度ピークと前記半導体基板の前記上面との間の上面側水素濃度と、前記第2の水素濃度ピークと前記半導体基板の前記下面との間の下面側水素濃度のいずれよりも高い
請求項2に記載の半導体装置。 - 前記中間ドナー濃度が、1×1013/cm3以上、1×1015/cm3以下である
請求項2または3に記載の半導体装置。 - 前記中間ドナー濃度は、前記上面側ドナー濃度および前記下面側ドナー濃度のそれぞれに対して1.5倍以上である
請求項2から4のいずれか一項に記載の半導体装置。 - 前記水素化学濃度分布は、
前記第1の水素濃度ピークから前記上面側に向かって水素濃度が減少する第1の上面側裾と、
前記第1の水素濃度ピークから前記下面側に向かって、前記第1の上面側裾よりも緩やかに水素濃度が減少する第1の下面側裾と、
前記第2の水素濃度ピークから前記下面側に向かって水素濃度が減少する第2の下面側裾と、
前記第2の水素濃度ピークから前記上面側に向かって、前記第2の下面側裾よりも緩やかに水素濃度が減少する第2の下面側裾と
を有する請求項2から5のいずれか一項に記載の半導体装置。 - 前記第1の水素濃度ピークが前記第2の水素濃度ピークよりも高く、
前記下面側ドナー濃度が、前記上面側ドナー濃度よりも高い
請求項2から6のいずれか一項に記載の半導体装置。 - 前記第2の水素濃度ピークが前記第1の水素濃度ピークよりも高く、
前記上面側ドナー濃度が、前記下面側ドナー濃度よりも高い
請求項2から6のいずれか一項に記載の半導体装置。 - 前記半導体基板は、
第1導電型のドリフト領域と、
前記半導体基板の前記上面に設けられたトレンチ部と、
前記ドリフト領域と前記半導体基板の前記下面との間に設けられ、前記ドリフト領域よりも高濃度の第1導電型のバッファ領域と
を有し、
前記第1の水素濃度ピークおよび前記第2の水素濃度ピークは、前記深さ方向において前記トレンチ部の下端と前記バッファ領域の上端との間に配置され、
前記第1の水素濃度ピークと前記第2の水素濃度ピークとの間の中間ドナー濃度が、前記第1の水素濃度ピークと前記半導体基板の前記上面との間の上面側ドナー濃度と、前記第2の水素濃度ピークと前記半導体基板の前記下面との間の下面側ドナー濃度のいずれよりも低い
請求項1に記載の半導体装置。 - 前記第1の水素濃度ピークと前記第2の水素濃度ピークの両方が、前記半導体基板の前記深さ方向における中央と、前記上面との間に配置されている
請求項9に記載の半導体装置。 - 前記中間水素濃度は、前記中間ドナー濃度の10倍以上である
請求項3に記載の半導体装置。 - 前記下面側ドナー濃度および前記上面側ドナー濃度の両方が、前記半導体基板のバルク・ドナー濃度よりも高濃度である
請求項1から11のいずれか一項に記載の半導体装置。 - 前記半導体基板の深さ方向におけるドナー濃度分布が、前記第1の水素濃度ピークと前記半導体基板の前記上面との間、および、前記第2の水素濃度ピークと前記半導体基板の前記下面との間の両方において、平坦部分を有する
請求項1から12のいずれか一項に記載の半導体装置。 - 前記半導体基板の深さ方向におけるドナー濃度分布が、前記第1の水素濃度ピークと前記第2の水素濃度ピークとの間において、平坦部分を有する
請求項1から13のいずれか一項に記載の半導体装置。 - 前記第1の水素濃度ピークと前記第2の水素濃度ピークの前記深さ方向における距離が、前記半導体基板の前記深さ方向における厚みの1/2以下である
請求項1から14のいずれか一項に記載の半導体装置。 - 半導体基板の上面および下面の一方の面から、第1の深さ位置に水素イオンを注入し、
前記半導体基板の前記上面および前記下面の他方の面から、前記第1の深さ位置とは異なる第2の深さ位置に水素イオンを注入する水素注入段階と、
前記半導体基板を熱処理する熱処理段階と
を備える半導体装置の製造方法。 - 前記第2の深さ位置は、前記第1の深さ位置と、前記一方の面との間に配置されている
請求項16に記載の半導体装置の製造方法。 - 前記第2の深さ位置は、前記第1の深さ位置と、前記他方の面との間に配置されており、
前記半導体基板は、第1導電型のドリフト領域と、前記半導体基板の前記上面に設けられたトレンチ部と、前記ドリフト領域と前記半導体基板の前記下面との間に設けられ、前記ドリフト領域よりも高濃度の第1導電型のバッファ領域とを有し、
前記第1の深さ位置および前記第2の深さ位置は、前記半導体基板の深さ方向において前記トレンチ部の下端と前記バッファ領域の上端との間に配置されている
請求項16に記載の半導体装置の製造方法。 - 前記半導体基板の前記上面および前記下面の少なくとも一方をレーザーアニールするレーザーアニール段階を備え、
前記水素注入段階は、前記レーザーアニール段階の後に行う
請求項16から18のいずれか一項に記載の半導体装置の製造方法。
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE112020001029.5T DE112020001029B4 (de) | 2019-10-11 | 2020-09-08 | Halbleitervorrichtung und herstellungsverfahren einer halbleitervorrichtung |
| JP2021550520A JP7222435B2 (ja) | 2019-10-11 | 2020-09-08 | 半導体装置および半導体装置の製造方法 |
| CN202080026129.3A CN113711364B (zh) | 2019-10-11 | 2020-09-08 | 半导体装置和半导体装置的制造方法 |
| US17/486,968 US11901419B2 (en) | 2019-10-11 | 2021-09-28 | Semiconductor device and manufacturing method of semiconductor device |
| JP2023015355A JP7476996B2 (ja) | 2019-10-11 | 2023-02-03 | 半導体装置 |
| US18/437,199 US12302617B2 (en) | 2019-10-11 | 2024-02-08 | Semiconductor device and manufacturing method of semiconductor device |
| JP2024066963A JP7726327B2 (ja) | 2019-10-11 | 2024-04-17 | 半導体装置 |
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| US11444157B2 (en) * | 2020-03-02 | 2022-09-13 | Mitsubishi Electric Corporation | Semiconductor device including first and second buffer layers |
| JP7466790B1 (ja) * | 2023-02-27 | 2024-04-12 | 三菱電機株式会社 | 半導体装置の製造方法 |
| EP4113624B1 (en) * | 2021-06-28 | 2025-05-21 | Huawei Technologies Co., Ltd. | Semiconductor device and related chip and preparation method |
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| CN111095569B (zh) | 2018-03-19 | 2023-11-28 | 富士电机株式会社 | 半导体装置及半导体装置的制造方法 |
| DE112020001029B4 (de) * | 2019-10-11 | 2025-06-05 | Fuji Electric Co., Ltd. | Halbleitervorrichtung und herstellungsverfahren einer halbleitervorrichtung |
| JP7400834B2 (ja) * | 2019-12-18 | 2023-12-19 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
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| JP7726327B2 (ja) | 2025-08-20 |
| JP2024091793A (ja) | 2024-07-05 |
| DE112020001029T5 (de) | 2021-11-25 |
| DE112020001029B4 (de) | 2025-06-05 |
| JP2023041915A (ja) | 2023-03-24 |
| JP7222435B2 (ja) | 2023-02-15 |
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| US12302617B2 (en) | 2025-05-13 |
| US11901419B2 (en) | 2024-02-13 |
| JPWO2021070539A1 (ja) | 2021-04-15 |
| CN113711364B (zh) | 2025-07-15 |
| JP7476996B2 (ja) | 2024-05-01 |
| US20220013643A1 (en) | 2022-01-13 |
| CN113711364A (zh) | 2021-11-26 |
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