WO2006038305A1 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- WO2006038305A1 WO2006038305A1 PCT/JP2004/014894 JP2004014894W WO2006038305A1 WO 2006038305 A1 WO2006038305 A1 WO 2006038305A1 JP 2004014894 W JP2004014894 W JP 2004014894W WO 2006038305 A1 WO2006038305 A1 WO 2006038305A1
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/64—Double-diffused metal-oxide semiconductor [DMOS] FETs
- H10D30/66—Vertical DMOS [VDMOS] FETs
- H10D30/668—Vertical DMOS [VDMOS] FETs having trench gate electrodes, e.g. UMOS transistors
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- H10D12/00—Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
- H10D12/411—Insulated-gate bipolar transistors [IGBT]
- H10D12/441—Vertical IGBTs
- H10D12/461—Vertical IGBTs having non-planar surfaces, e.g. having trenches, recesses or pillars in the surfaces of the emitter, base or collector regions
- H10D12/481—Vertical IGBTs having non-planar surfaces, e.g. having trenches, recesses or pillars in the surfaces of the emitter, base or collector regions having gate structures on slanted surfaces, on vertical surfaces, or in grooves, e.g. trench gate IGBTs
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- H10D30/028—Manufacture or treatment of FETs having insulated gates [IGFET] of double-diffused metal oxide semiconductor [DMOS] FETs
- H10D30/0291—Manufacture or treatment of FETs having insulated gates [IGFET] of double-diffused metal oxide semiconductor [DMOS] FETs of vertical DMOS [VDMOS] FETs
- H10D30/0297—Manufacture or treatment of FETs having insulated gates [IGFET] of double-diffused metal oxide semiconductor [DMOS] FETs of vertical DMOS [VDMOS] FETs using recessing of the gate electrodes, e.g. to form trench gate electrodes
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
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- H10D62/83—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group IV materials, e.g. B-doped Si or undoped Ge
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- H05K1/053—Insulated conductive substrates, e.g. insulated metal substrate the metal substrate being covered by an inorganic insulating layer
Definitions
- the present invention relates to a semiconductor device that operates at high speed and high power and a method for manufacturing the same.
- High-speed transistors operating in the microwave band and high-power transistors used for power conversion are applied in various fields including home appliances.
- Semiconductor elements that make up high-power transistors or high-power transistors include bipolar transistors, thyristors, GT0, IGBT, and M0SFET. These devices require high-power 0N / 0FF at high speed with a pulse signal, and a semiconductor substrate different from the substrate for integrated circuits formed on a plane is used for the purpose of achieving both power supply breakdown voltage and high-speed performance.
- the semiconductor substrate that has been used to configure these elements is a low-concentration n-type semiconductor, which is a region for forming elements on a high-concentration n-type semiconductor silicon layer 1301 that is a substrate base.
- ion implantation technology impurity diffusion technology, lithography technology, etc.
- a semiconductor silicon layer having three or four different impurity concentrations or conductivity types is formed to form a desired semiconductor element. It was. Since the semiconductor element formed in this way flows from the back side to the front side (or the opposite direction) of the substrate, the element is just manufactured, so the substrate is thick and has a thickness of 200 ⁇ m to lmra. electric resistance of the substrate to be inserted in series in size Rere c Thus, the polished back surface of the substrate 20 ⁇ m ⁇ 200 ⁇ ⁇ of the eventually back side polishing technique of high impurity concentration silicon substrate which is a support substrate Therefore, after reducing the substrate thickness of the device for the purpose of reducing the series electric resistance, a semiconductor device was completed by providing a metal electrode on the back surface. The thickness of the semiconductor element after the back surface polishing is about 200 m. If it was made thinner than this, the mechanical strength was lowered and the element was broken.
- the plane orientation of semiconductor silicon crystals used in conventional semiconductor elements is low in the interface state density at the silicon 'gate insulating film interface in M0SFETs and IGBTs, and a high-quality oxide film with high withstand voltage can be obtained. Only the ⁇ 100 ⁇ plane orientation.
- the substrate plane orientation since the ⁇ 100 ⁇ plane could only be used from the viewpoint of manufacturing technology, the diffusion constant of electrons and holes was small, and the current conduction or cutoff speed of the device could not be increased. Has occurred.
- the element is formed on the silicon substrate, the heat generation of the element is difficult to be released outside the element, and the temperature of the element rises, resulting in an extreme increase in electrons or holes, and the element is thermally If you run out of control or need a complex temperature compensation circuit It was closed.
- the object of the present invention is to solve such problems, enable the introduction of a thin semiconductor layer that cannot be achieved by the prior art, reduce the series resistance of the substrate, increase the operating speed of the device, and The purpose is to make it possible to easily obtain a substrate whose impurity concentration profile is controlled in advance before manufacturing the device, and to reduce the manufacturing cost of the semiconductor device.
- an object of the present invention is to form an element capable of conducting or interrupting current at high speed by using a ⁇ 110 ⁇ plane in the element that can obtain a high electron diffusion constant and a hole diffusion constant.
- the ⁇ 110 ⁇ plane orientation refers to a plane orientation crystallographically equivalent to the (110) plane, for example, the plane orientation collectively referring to the (010) plane, the (001) plane, and the like.
- the wiring connecting the elements can be shortened, and the parasitic capacitance of the wiring can be reduced. The purpose is to reduce the inductance and drive the semiconductor device at high speed.
- the present invention provides a semiconductor substrate in which a semiconductor layer is formed on a substrate made of a metal substrate, and the metal substrate is made of a first metal.
- the semiconductor layer is a silicon layer having one of ⁇ 110 ⁇ plane orientation and a plane orientation equivalent to the plane orientation, and the semiconductor layer is a plurality of semiconductors having different conductivity types. It consists of layers.
- the semiconductor element of the present invention has a ⁇ 110 ⁇ plane orientation and a plane orientation equivalent to that. It is characterized by forming bipolar transistors, vertical M0SFETs, and IGBTs in a single crystal or in combination.
- the vertical semiconductor element of the present invention is characterized in that a plurality of vertical semiconductor elements having different polarities are separated by an element isolation region and integrated on a single substrate.
- the semiconductor element of the present invention is formed on a metal substrate, and the thickness of the semiconductor layer located immediately above the metal substrate is 20 ⁇ or less.
- the method for forming a semiconductor substrate and a semiconductor element according to the present invention is a method for manufacturing a semiconductor substrate having a plurality of semiconductor layers having different conductivity types on a metal substrate, and porous silicon is formed on the silicon substrate.
- the method for producing a semiconductor element semiconductor substrate according to the present invention includes a step of forming a plurality of vertical semiconductor elements having different polarities on the same substrate, The method includes a step of forming an element isolation region for isolation.
- the method for forming a semiconductor substrate and a semiconductor element of the present invention includes a step of forming the epitaxial silicon layer at a low temperature of 600 ° C. or lower.
- a metal substrate is obtained by previously laminating a semiconductor silicon layer having a controlled impurity concentration profile composed of crystals of ⁇ 110 ⁇ plane orientation on a low resistance metal substrate at a low temperature of about 600 ° C. or less. Since the semiconductor layer is formed on top, the semiconductor layer can be thinned without the problem of substrate breakage in the backside polishing, which has been a problem in the past, so that unnecessary parasitic resistance can be reduced and the device can be reduced. It can be driven at high speed, and the series resistance of the vertical semiconductor device can be reduced by reducing the thickness of the semiconductor layer, which was about 200 m, to 20 m or less.
- Figure 2 plots the cutoff frequency of a bipolar transistor against the substrate thickness.
- the conductivity, substrate concentration, and thickness for the emitter, base, and collector layers are n-type l X 10 20 cm- 3 , P-type 5 X 10 18 cnf 3 , 0.02 im; and n-type 2 X 10 17 cnf 3 , 0.5 ⁇ ⁇ , and ⁇ type 1 X 10 2 . cm— 3 It shows the dependency of the case.
- the substrate needs to be as low resistance as possible to reduce the series resistance of the element, and the impurity concentration of the substrate is low enough that the substrate resistivity is about lmQ cm or less 1 X 10 2Q cm-about 3 or more is required.
- the cutoff frequency begins to deteriorate, and at the conventional substrate thickness of 200 ⁇ , the cutoff frequency degrades to about half of the maximum value.
- the device can be driven at high speed by introducing a substrate of 20 ⁇ m or less.
- the above-mentioned n-type substrate can obtain the same effect even when a p-type substrate having the opposite conductivity type is used at an impurity concentration of about 1 ⁇ 10 20 cm ⁇ 3 or more.
- the semiconductor silicon layer constituting the semiconductor layer uses a crystal having a ⁇ 110 ⁇ plane orientation parallel to the substrate surface, thereby increasing the diffusion constant of electrons or holes and increasing the speed. Current can be conducted or cut off.
- a plurality of vertical semiconductor elements are formed on a single substrate, and wirings are formed on both sides of the semiconductor layer, thereby integrating the semiconductor elements.
- the parasitic capacitance and inductance of the elements and wiring can be reduced, which alleviates the problems of device operation delay and surge voltage generation, which were problems in the past. can do.
- the wiring layers can be formed on both surfaces of the vertical semiconductor layer, the vertical semiconductor element inverter or the like, which can only be obtained by mounting individual elements on the wiring board in the past. Since ECL (emitter coupling element) can be easily formed on a single substrate, various integrated circuits using vertical semiconductors can be realized.
- the ⁇ 110 ⁇ plane orientation is a crystallographically equivalent plane orientation to the (110) plane.
- the (011) plane, the (101) plane, etc. are generically named.
- the object of the present invention can be achieved substantially equivalently.
- the (511) plane, (331) plane, (221) plane, (321) plane, Near (110) plane orientations such as (531) plane, (231) plane, (351) plane, (320) plane, (230) plane, etc. may be used.
- the semiconductor substrate of the present invention since the semiconductor layer is formed on the metal substrate, the series resistance of the element which has been a problem in the conventional vertical semiconductor element is sufficiently reduced. It is possible to conduct or cut off current at high speed. In addition, using a metal substrate improves the thermal conductivity of the substrate, so It is possible to suppress thermal runaway of the element due to the heat generation.
- a plurality of semiconductor layers having different conductivity types are formed in advance at a low temperature of about 600 ° C. or less, and the impurity profile can be precisely controlled. Therefore, a steep impurity profile with a staircase shape between adjacent semiconductor layers can be obtained, so that a depletion layer region formed between semiconductor layers having different conductivity types can be minimized.
- High-performance devices with a thin base layer or short channel length can be manufactured in a simple process.
- the impurity concentration profile on a substantially staircase is that both adjacent semiconductor layers are formed by the epitaxial growth method at a low temperature of about 600 ° C. or less, and the diffusion of impurities is small at the junction interface. This refers to the state where a steep concentration profile is obtained, and an impurity profile that cannot be obtained by the solid layer diffusion method or ion implantation method can be obtained.
- Diffusion constants in silicon at 600 ° C As a impurities present in the silicon, P, B, Sb, such as in not more than about 10- 2 ° cm 2 / s, time and diffusion constants are in the atmosphere
- the diffusion distance defined by the square root of the product is 0.6 angstroms in one hour, and in the present invention, the low temperature of 600 ° C. or lower refers to a region where no impurity diffusion occurs in silicon.
- FIG. 1 is a cross-sectional view showing the structure of a conventional silicon epitaxial substrate.
- FIG. 2 is a characteristic diagram showing the effect of improving the cut-off frequency indicating the operation speed of the device by reducing the series resistance of the device when the semiconductor layer thickness in the present invention is reduced.
- FIG. 3 is a cross-sectional view showing the structure of a semiconductor substrate for a bipolar transistor according to Example 1 of the present invention.
- 4 (a) to 4 (d) are schematic views showing a method for manufacturing a semiconductor substrate for a bipolar transistor according to Example 1 of the present invention in the order of steps.
- 5 (a) to 5 (d) are cross-sectional views showing the manufacturing method of the bipolar transistor according to the present invention in the order of steps.
- FIG. 6 is a cross-sectional view showing the structure of a vertical M0SFET semiconductor substrate according to Example 2 of the present invention. It is.
- FIGS. 7 (a) to 7 (e) are cross-sectional views showing in sequence the manufacturing method of the vertical M0SFET according to the second embodiment of the present invention.
- FIG. 8 is a cross-sectional view showing the structure of an IGBT substrate according to Embodiment 3 of the present invention.
- FIGS. 9 (a) to 9 (e) are schematic diagrams showing the method of manufacturing an IGBT according to Example 3 of the present invention in the order of steps.
- FIGS. 10 (a) to 10 (c) are circuit diagrams showing an example of a semiconductor device formed by manufacturing a vertical semiconductor element on a single substrate according to Embodiment 4 of the invention.
- FIG. 11 is a cross-sectional view showing an example of a semiconductor device formed by manufacturing a vertical semiconductor device according to Example 4 of the present invention on a single substrate.
- FIGS. 12 (a) to 12 (j) show a method of manufacturing a semiconductor device according to Embodiment 4 of the present invention (first half) formed by manufacturing a vertical semiconductor element on a single substrate. It is a schematic diagram shown in process order.
- FIGS. 13 (a) to 13 (f) show steps of the semiconductor device manufacturing method (second half) according to the fourth embodiment of the present invention formed by manufacturing vertical semiconductor elements on a single substrate. It is the schematic diagram shown in order.
- FIGS. 14 (a) to 14 (d) show a method for manufacturing a semiconductor device according to Example 5 of the present invention formed by manufacturing a vertical semiconductor element on a single substrate. It is a schematic diagram which shows the method of forming a wiring structure in order of a process.
- FIG. 3 shows a cross-sectional structure of the bipolar transistor substrate according to this example.
- the bipolar transistor substrate includes a Si layer 101 having a first conductivity type for forming an emitter layer, and a first conductivity type as a second conductivity type for forming a base layer.
- the opposite type A Si layer 102 having a third conductivity type for forming a collector layer, a Si layer 104 having a fourth conductivity type for forming a collector electrode contact region, and the second
- the metal substrate 108 is connected to the Si layer having the four conductivity types and forms the collector electrode, and the bonding layer 107 is used to bond the semiconductor layer and the metal substrate.
- the illustrated metal substrate 108 is a connecting metal made of a base formed of a first metal (for example, Cu) and a second metal (for example, Ni) formed to cover the base. It is composed of layers.
- a Si layer having a plurality of conductivity types is formed in advance on a metal substrate, and the Si layer 104 having the fourth conductivity type has an impurity concentration of l X 10 2G cnf 3 Since the thickness is about 20 im or less, the series resistance of the formed element can be reduced, and an element that operates at high speed can be easily formed. Furthermore, the Si layer is a Si single crystal having a ⁇ 110 ⁇ plane orientation, and has a large diffusion constant compared to the case of using a conventional ⁇ 100 ⁇ plane orientation substrate, thereby improving the operation speed.
- the Si layer is formed by low temperature epitaxial growth at about 600 ° C. or less, and the impurity profile is precisely controlled, so that a high-performance device can be easily manufactured.
- a method of manufacturing such a bipolar transistor substrate will be described with reference to FIG. FIG. 4 shows the manufacturing method of the bipolar transistor according to the first embodiment, taking an npn-type bipolar transistor substrate as an example, and is formed as follows.
- a porous silicon layer 202 is formed on a silicon substrate 201 having a ⁇ 110 ⁇ surface by using an anodization method, which becomes a base for epitaxial growth and then separates the silicon substrate from the silicon layer (FIG. 4).
- the surface micropores are sealed by treating this in a hydrogen atmosphere at 1200 ° C.
- Epitaxial growth of n- type silicon 203 to be an emitter layer is performed by sputtering at a temperature of 400 ° C.
- the p-type base layer 204, the n-type collector layer 205, and the n-type high-concentration collector layer 206 are sequentially epitaxially grown (FIG. 4 (b)).
- each layer is 0 ⁇ 7 ⁇ ⁇ , 0.02 im, 0.5 m, 0.5 ⁇ ⁇ , and the impurity concentration is 1 X 10 2 ° cm— 3 , 5 X 10 18 cm- 3 , 2 ⁇ 10 17 cm ′ 3 and 1 ⁇ 10 2 ° cm— 3 .
- These values can be varied depending on the intended use of the device and the withstand voltage.
- it is desirable that the high-concentration collector layer 206 is sufficiently thin for the purpose of reducing resistance, and is 20 ⁇ or less. Is desirable.
- the above-described silicon substrate is bonded to a metal substrate 208, which will be described later, to be a support substrate for the element.
- a Ni layer is formed on the bonding interface between the metal substrate and the silicon substrate, and a silicide layer 207 for bonding the metal substrate and the semiconductor layer by silicidation reaction at a temperature of about 500 ° C. or less by an RTA method or the like. Formed and joined.
- the above metal substrate is formed as follows. First, prepare a Cu substrate to be the base of the metal substrate. The thickness of the Cu substrate was set to 200 // m which does not cause a problem in mechanical strength. Subsequently, TaN is formed on the surface of the Cu substrate by, for example, a normal sputtering method in order to prevent diffusion of Cu into the silicon layer. On the entire surface of the Cu substrate on which the TaN film is sputtered, Ni is formed by a plating method that allows the substrate to be bonded at a low temperature of about 400 to 500 ° C. by passivation of the metal substrate surface and silicidation with Si. In this way, the metal substrate is formed.
- the material that forms the base of the metal substrate is not limited to Cu, but a conductive metal or metal compound having a resistivity of about 100 ⁇ cm or less, such as Au and Ag, which can sufficiently reduce the substrate resistance compared to the high-concentration collector layer. I just need it.
- the diffusion preventing layer is not limited to TaN, and any layer can be used as long as it can prevent diffusion of elements constituting the metal substrate into Si, such as TaSiN, TiN, TiSiN.
- Ni in the connecting metal layer that acts as a bonding material by silicidation is not limited to this, but a material that can bond substrates by causing a silicidation reaction with Si at a low temperature of about 500 ° C or less, such as Ti and Co. If it is good.
- the semiconductor substrate according to Example 1 is formed.
- the semiconductor substrate according to Example 1 is formed.
- the thickness and impurity concentration of each layer can be precisely controlled.
- each functional layer Since it can be formed by continuous spuck film formation, it is not necessary to use techniques such as impurity diffusion or ion implantation as in the prior art, and a substrate can be formed very easily and with high quality as a substrate for element formation.
- a photoresist 307 for masking the emitter region is applied on the semiconductor substrate completed by the above-described process (FIG. 5A), and the resist is patterned using a stepper or the like to form an emitter region. Openings are made in the resist on the emitter layer other than the part (Fig. 5 (b)).
- the emitter layer under the resist opening is removed by RIE or the like.
- ions are implanted into the base layer 305 to form a base contact layer 308 for making electrical contact between the metal forming the base electrode and the silicon layer ( Figure 5 (c)). Since the resister exists in the emitter region, ion implantation is not performed.
- ion implantation is performed so that the impurity density of the base layer is l X 10 2Q cnr 3 except emitter directly below using an ion implantation technique used in semiconductor manufacturing using a BF 2 + as the ion species, Recrystallization was performed by heat treatment in nitrogen at 550 ° C for 1 hour. At a temperature of 550 ° C, recrystallization was possible without causing problems such as impurity diffusion.
- Interlayer insulating film is not limited to Si0 2, SiON used in semiconductor manufacturing, Si OF, polyimide, it may be any insulating material such as PTFE.
- the base electrode 309 and the emitter electrode 310 are formed by depositing and patterning A1 containing about 1% of Si in atomic composition by sputtering. (Fig. 5 (d)).
- a low contact resistance may be achieved by using a salicide technique in which Co, Ni or the like is formed by sputtering in advance and self-aligned silicidation is performed using the RTA method.
- a bipolar transistor is fabricated using the substrate shown in the first embodiment.
- the ⁇ 110 ⁇ plane with a large diffusion constant is used as the crystal plane orientation, a semiconductor device can be fabricated at a higher speed than in the past.
- the high-concentration collector layer is as thin as 0.2 m and has a sufficiently low resistance, so the device characteristics do not deteriorate due to the substrate resistance as in the past.
- the cutoff frequency which indicates the high speed of the element, was about 50 GHz for the conventional ⁇ 100 ⁇ plane silicon substrate device, whereas 116 GHz was obtained in this example.
- FIG. Fig. 6 shows the vertical M0SFET substrate in Example 2.
- the high-concentration drain layer 403 showing the first conductivity type on the metal substrate 401, and the second conductivity type having a different impurity concentration from the first conductivity type.
- the drain layer 404 and the third conductivity type opposite to the first conductivity type are shown, and the body layer 405 in which the channel of the M0SFET is formed is the same as the method shown in the first embodiment.
- the conductivity type, impurity concentration and thickness of each layer are n-type IX 10 2 ° cm— 3 , 0.2 ⁇ ⁇ for the high-concentration drain layer, and ⁇ -type 2 X 10 17 cnf 3 , 0. ⁇ ⁇ ⁇ for the drain layer
- the body layer was ⁇ -type 5 X 10 18 cm— 3 0.2 m.
- a Si layer having a plurality of conductivity types is formed in advance on a metal substrate, and the Si layer 403 having the first conductivity type has an impurity concentration.
- the Si layer is a Si single crystal having a ⁇ 110 ⁇ plane orientation, and has a large diffusion constant and can improve the operation speed as compared with the case of using a conventional ⁇ 100 ⁇ plane orientation substrate.
- the Si layer is formed by low-temperature epitaxial growth at about 600 ° C or lower, and the impurity profile is precisely controlled, so that high-performance devices can be easily manufactured. like this A method for manufacturing a vertical M0SFET using a vertical M0SFET substrate will be described with reference to FIG.
- FIG. 7 shows a manufacturing method of a vertical n-channel M0SFET using the vertical M0SFET substrate according to the second embodiment, which will be described below.
- As + which is an ion forming a conductivity type opposite to that of the body region, is implanted by ion implantation to form the source region 506 (FIG. 7 (a)).
- an interlayer insulating film and 0. 5 ⁇ deposited Si0 2 507 by the CVD method (FIG. 7 (b)).
- a trench hole 508 is formed at a location to be the gate electrode (FIG. 7 (c)). This is done as follows.
- Photoresist is applied to the entire surface of the substrate, the photoresist is patterned, and an opening is provided in the resist of the trench creating part. The opening is arranged in the source region.
- a trench hole is formed by a commonly used RIE method.
- the bottom of the trench hole 508 is formed so as to reach the drain region 504, and in this embodiment, it has a thickness of 0.8 ⁇ m, a width of 0.3 ⁇ m, and a length of 20 ⁇ . This value can be changed depending on the purpose of use of the element.
- a gate oxide film is formed. Formation of a gate oxide film, and plasma oxidation at a temperature of 400 ° C using a mixed gas of Kr and O 2, to form the Sani ⁇ thickness of 5nm on the tray Nchihoru inner wall. As a result, a high-quality acid film having a breakdown voltage of 10 MVm or more can be uniformly formed on the inner wall of the trench hole 508 (FIG. 7 (d)).
- a gate electrode 510 is formed.
- poly-Si is deposited as a gate electrode material by 0.1 ⁇ m at 400 ° C by CVD, and then Si is 1 ° / in atomic composition.
- A1 containing the film was deposited by sputtering. Photoresist is applied to the entire surface of the substrate, and the gate electrode is patterned to complete the gate electrode.
- the entire surface of the substrate by CVD deposited Si0 2 at a temperature of 400 ° C, against the source scan electrode 509 by applying a photoresist to form the source electrode Perform patterning.
- the photoresist opening is formed so as to extend over both the source n + layer 506 and the body p layer 505. In this way, both the source potential and the body potential can be taken at the source electrode.
- the source electrode 509 is formed by sputtering and forming A1 containing about 1% of Si in atomic composition by sputtering (FIG. 7 (e)).
- the vertical M0SFET using the substrate according to Example 2 of the present invention is completed through the above steps. It is not necessary to perform ion implantation for forming a bodywell as in the prior art, and the impurity concentration can be accurately controlled. Furthermore, since the functional layer necessary for element formation is built in the substrate in advance, the element manufacturing process can be simplified. In addition, the high-concentration drain layer is formed as thin as 0.2 111 and has a sufficiently low resistance, so that the series resistance of the element is low, and the speed performance of the element is degraded by the substrate resistance as in the past. No vertical 0SFET was obtained.
- a drain short-circuit type element in which p + and n + silicon are alternately arranged in the high concentration drain region can achieve the same effect.
- vertical p-channel M0SFETs in which the conductivity type of each layer is the opposite conductivity type can be manufactured by the same process. An example is shown below.
- a vertical P-channel M0SFET substrate with the structure shown in Fig. 6 can be used.
- the structure shown in Fig. 7 (a) is a high-concentration drain layer 50 3 having the first conductivity type, and the conductivity type is the same as that of the drain layer 50 4 and the first conductivity type, although the impurity concentration is different from this.
- the conductivity, impurity concentration, and thickness of each layer are p-type l X 10 20 cm “ 3 , 0.2 ⁇ m for the high-concentration drain layer, p-type 2 X 10 17 cm -3 , 0.5 ⁇ ⁇ for the drain layer
- the body layer is ⁇ -type 5 X 10 18 cnf 3 0.2 m
- the high-concentration drain layer 50 3 has an impurity concentration of about 1 X 10 20 cm- 3 and a thickness of Since it is 20 ⁇ m or less, the series resistance of the formed element can be reduced, and an element that operates at high speed can be easily formed.
- the layer 5 0 3 has an S having (1 1 0) plane orientation.
- the vertical trench structure P-channel M0SFET uses the substrate shown in FIG. 6 to form the body region 505 in order to form the source region as shown in FIG.
- BF 2 + is implanted by ion implantation to form a source region 506.
- a trench hole 508 is formed at a location to become the gate electrode. This is done as follows. Photoresist is applied to the entire surface of the substrate, the photoresist is patterned, and an opening is formed in the resist in the trench creating portion. The opening is arranged in the source region. Next, trench holes are formed by the commonly used RIE method. The bottom of the trench Honor 508 is formed so as to reach the drain region 504. In this embodiment, the depth is 0.8 m, the width is 0.3 ⁇ , and the length is 20 ⁇ . This value can be changed depending on the intended use of the device. Since the surface of the silicon 505 is the (1 10) plane, the inner wall surface of the trench hole 508 that forms 90 ° with it is also the (1 10) plane.
- a gate oxide film 5 11 is formed. Formation of a gate oxide film, and plasma oxidation at a temperature of 400 ° C using a mixed gas of Kr and O 2, to form a silicon oxide film of 20 nm in thickness on the trench hole's inner wall. As a result, a high-quality oxide film 5111 having a withstand voltage of 4 to 5 MV / cm can be formed uniformly on the (1 10) plane inner wall of the trench hole 508.
- the withstand voltage between the gate and source of the P-channel MOS transistor having the gate oxide film 51 1 is 10V.
- a gate electrode 510 is formed.
- a gout electrode material for example, poly Si was deposited by a CVD method at 400 ° C at a temperature of 400 ⁇ C, and then A 1 containing about 1% of Si by atomic composition was formed by a sputtering method. Photoresist is applied to the entire surface of the substrate and the gate electrode portion is patterned to complete the gate electrode 510.
- SiO 2 is deposited over the entire surface of the substrate by a CVD method at a temperature of 400 ° C. to form an interlayer insulating film 512, and a source electrode 509 is formed.
- the source electrode is formed by first applying a photoresist and patterning the opening for the source electrode portion 59. When patterning the source electrode opening, the photoresist opening is formed so as to extend over both the source p + layer 50 6 and the body n layer 50 5.
- both the source potential and the body potential can be taken at the source electrode 59.
- a 1 containing about 1% of S i in atomic composition A source electrode 50 9 is formed by sputtering and patterning this by etching.
- the trench structure vertical P-channel power M0S field effect transistor according to the present embodiment is completed through the above steps. Since the high-concentration drain layer 50 3 is formed as thin as 0.2 ⁇ and is sufficiently low in resistance, the series resistance of the device is low, and a high-speed transistor is obtained.
- FIG. 8 is a vertical IGBT substrate in Example 3, which has an anode layer 603 having a first conductivity type on a metal substrate 601 and a second conductivity type opposite to the first conductivity type.
- the buffer layer 604, the conductivity modulation layer 605, and the gate layer 606, which is the third conductivity type having the same polarity as the anode layer, have the ⁇ 110 ⁇ plane in the same manner as in the first embodiment. It is formed on a silicon substrate.
- the conductivity type, impurity concentration, and thickness of each layer are ⁇ -type l X 10 2t) cnf 3 , 0.2 ⁇ for the anode layer, and ⁇ -type l X 10 2 ° cnf 3 for the buffer layer.
- the anode layer 603 is sufficiently thin for the purpose of reducing resistance, and is preferably 20 or less.
- the substrate for IGBT in Embodiment 3 of the present invention is formed by previously forming a Si layer having a plurality of conductivity types on a metal substrate, and the Si layer 603 having the first conductivity type has an impurity concentration of l X 10 2Q Cn r 3 or more and thickness is 20 ⁇ or less Therefore, the series resistance of the formed element can be reduced, and an element that operates at high speed can be easily formed.
- the Si layer is a Si single crystal having a ⁇ 110 ⁇ plane orientation, and has a large diffusion constant and can improve the operation speed as compared with the case of using a conventional ⁇ 100 ⁇ plane orientation substrate.
- the Si layer is formed by low temperature epitaxial growth at about 600 ° C or lower, and the impurity profile is precisely controlled, so that a high-performance device can be easily manufactured.
- An IGBT manufacturing method using such an IGBT substrate will be described with reference to FIG. Figure 9 shows an example of how to form an n-channel gate IGBT device on the above-mentioned semiconductor substrate.
- the cathode region 707 is formed by ion implantation of As +, which is an ion for forming a conductivity type opposite to that of the gate layer (FIG. 9 (a)). Subsequently, 0.5 ⁇ was deposited as SiO 2 708 as an interlayer dielectric by CVD (Fig. 9 (b)). As a result, the overlapping capacity between the gate electrode and the cathode region can be reduced.
- a trench hole 709 is formed at a location to be a gate electrode. Photoresist is applied to the entire surface of the substrate, patterning is performed, and an opening is formed in the resist in the trench creation part.
- a trench hole 709 is formed by a commonly used RIE method. The depth of the trench hole is formed so as to reach the conductivity modulation layer 705, and in this example, ⁇ ⁇ ⁇ . ⁇ ⁇ ⁇ , width 0.3 ⁇ length 20 111 (FIG. 9 ()). It can be changed according to the purpose of use.
- a gate oxide film is formed. Formation of a gate oxide film, and plasma oxidation at temperature of 400 ° C by using plasma excited by plasma mixed gas of Kr and O 2, to form a 5nm thickness of Sani ⁇ . As a result, a high-quality oxide film with a withstand voltage of 10 MV / cm or more can be uniformly formed on the inner wall of the trench hole 709 (FIG. 9 (d)). Following the above, a gate electrode 710 is formed.
- Poly-Si was deposited as a gate electrode material by CVD using a CVD method at 400 ° C to a depth of about 0.1 ⁇ m ⁇ , and A1 containing about 1% of Si in atomic composition was deposited by a sputtering method. Photoresist is applied to the entire surface of the substrate and the gate electrode portion is patterned to complete the gate electrode 710.
- SiO 2 is deposited over the entire surface of the substrate by a CVD method at a temperature of 400 ° C., and a photoresist is applied to form a cathode electrode.
- a photoresist is applied to form a cathode electrode.
- the photoresist opening is formed so as to extend over both the source n + layer and the body p layer. By doing so, both the source potential and the body potential can be taken by the force sword electrode.
- a contact hole is formed by etching Si02 in the photoresist opening using the RIE method, and A1 containing about 1% of Si in atomic composition is formed by the sputtering method to form the source electrode 711 (FIG. 9). ().
- the vertical IGBT using the substrate according to Example 3 of the present invention is completed through the above steps. Unlike the conventional method, it is not necessary to perform ion implantation for forming a tool, and the impurity concentration can be accurately controlled. Since the functional layers necessary for the device are already built in the substrate, the device manufacturing process can be simplified. In addition, the anode layer was thinly formed at 0.2 111, and the resistance was sufficiently low, so the series resistance of the element was small and high-speed switching could be realized.
- an equivalent effect can be obtained even with an anode short-circuit element in which p + and n + silicon are alternately arranged in the anode region.
- FIG. 10 shows a complementary inverter device using bipolar transistors.
- Figure 10 (b) shows a complementary inverter device using a vertical M0SFET.
- Figure 10 (c) shows a complementary inverter device using an IGBT.
- Each semiconductor element that constitutes such an inverter device has a structure in which conduction types are inverted with respect to each other, and is a vertical element, so that the element penetrates the substrate from the front surface to the back surface.
- a plurality of elements having different polarities cannot be formed on the same semiconductor substrate.
- the elements created on different semiconductor substrates are manufactured by mounting them as individual elements, they cannot be integrated, are large-sized, and the wirings connecting the constituent elements are long distances.
- the inductance could not be reduced, and thus a problem such as generation of a surge voltage due to the inductance component occurred.
- the conventional pnp bipolar transistor formed in the ⁇ 100 ⁇ plane orientation is a diffusion constant for electrons and holes. Since the number is small, the operation speed is slow, and it has been difficult to realize a complementary element as shown in FIG.
- the semiconductor device according to the fourth embodiment operates as an integrated circuit by forming wirings between the semiconductor elements on the semiconductor substrate by manufacturing each semiconductor element constituting the semiconductor device on a single semiconductor substrate. It was possible to do so. Since the semiconductor layer that forms the semiconductor element uses silicon with ⁇ 110 ⁇ plane orientation, the diffusion constant of electrons and holes is large, and even if a pnp bipolar transistor is used, the same performance as an npn bipolar transistor is achieved. Therefore, a complementary configuration is possible, and a plurality of elements with reversed polarities can be mixed on a single semiconductor substrate, so that a semiconductor device such as an inverter can be reduced in size and wiring between elements can be reduced.
- FIG. 11 is a phase net type inverter device formed using npn-type and pnp-type bipolar transistors in the semiconductor device according to the fourth embodiment.
- the reference numerals in the figure correspond to those in FIGS. 12 and 13.
- An npn-type bipolar transistor 1021 and a p3 ⁇ 4) -type bipolar transistor 1022 are formed on a metal substrate 1015, and are separated in an element isolation region 1023. Both collector electrodes are electrically connected by a metal substrate, which realizes the circuit configuration shown in Fig. 10 (a). Since a structure in which a plurality of elements having different polarities are mixed can be formed on a single substrate, the integration of vertical semiconductor elements, which could only be realized by mounting individual individual elements, is a semiconductor substrate according to this embodiment. Can be realized. Since the collector electrode is not connected by external wiring as in the past, the parasitic capacitance and parasitic inductance related to the wiring can be reduced, and the conventional problems such as operation delay and generation of surge voltage can be solved. It is possible to provide a semiconductor device.
- FIGS. Figures 12 and 13 illustrate the manufacturing method of a complementary inverter using bipolar transistors as an example.
- a silicon substrate 1001 having a ⁇ 110 ⁇ plane orientation is a silicon epitaxial growth substrate, which is bonded to a metal substrate after being bonded to the metal substrate.
- a porous silicon layer 1002 for separation is formed by anodization. By treating this in a hydrogen atmosphere at 1200 ° C., the fine pores on the surface are sealed.
- n-type Si is about 0. 5 as Si having a conductivity type opposite to the first conductivity type of the first element to be formed later. Epitaxially grown to obtain buffer layer 1003.
- p + Si is formed by, for example, a sputtering method as a silicon layer 1004 showing the first conductivity type for forming the emitter electrode of the first element.
- the film was formed with a film thickness of 0.7 im.
- the p + Si 1004 surface to form a Si0 2 1005 by a CVD method at a temperature as a protective layer for example 400 ° C.
- the SiO 2 and the p + Si are patterned by photolithography, and the p + Si layer is etched until the buffer layer 1003 appears.
- the photoresist is removed, leaving the P + Si layer only in the region where the first element exists ( Figure 12 (b)). In this case the Si0 2 layer 1005 so as not to remove.
- a silicon layer having a second conductivity type opposite to the first conductivity type of the second element is deposited on the etched surface.
- n + Si is deposited to have the same thickness as p + Si, which is an example of the first conductivity type of the first element.
- the deposited n + Si grows as an epitaxial film 1006 that becomes the emitter electrode of the second element on the buffer film 1003, and as amorphous silicon or polysilicon 1007 on the oxide film on the p + Si. (Fig. 1 2 (c)).
- n + Si 1007 grown on the acid film is removed.
- For removal for example, use a mixed solution of iodic acid, hydrofluoric acid, and acetic acid that generates little heat.
- the non-single crystal n + Si 1007 grown on the oxide film has a higher etching rate than that of the single crystal n + Si 1006 grown epitaxially. Only non-single crystal n + Si 1007 can be removed without changing the thickness.
- the oxide film formed on the p + Si surface using a buffered hydrofluoric acid solution the structure shown in Fig. 12 (d) is completed.
- the layer 1008 indicating the third conductivity type serving as the base electrode of the second element is used as the layer 1008.
- a layer showing a conductivity type opposite to the second conductivity type of the second element is formed, for example, by sputtering.
- p-type Si was formed with a thickness of 0.02 ⁇ .
- SiO 2 1005 is formed on the surface on which the P-type Si layer 1008 is deposited, for example, at a temperature of 400 ° C. by a CVD method.
- Patterning is performed by photolithography, and unnecessary oxide film and p-type Si other than the portion where the second element is formed in the Si0 2 1005 and the p-type Si layer 1008 are removed by, for example, the RIE method (FIG. 1). 2 (e)).
- a layer showing the fourth conductivity type for forming the base electrode of the first element a layer showing a conductivity type opposite to the first conductivity type of the first element is formed by, for example, sputtering. It is formed by.
- n-type Si was formed with a thickness of 0.02 ⁇ .
- the deposited ⁇ -type Si grows as an epitaxial film 1009 on the p + Si film 1004, and grows as amorphous silicon or polysilicon 1010 on the oxide film 1005 on the p-type Si layer 1008 (FIG. 12). (f);).
- each layer was 0.5 ⁇ for the collector layers of the first and second elements, and 0.2 im for the high-concentration collector layers, respectively.
- the silicon substrate and the metal substrate 1015 are bonded together.
- a TaN layer is formed on the surface of a Cu substrate, for example, by sputtering to prevent diffusion, and then a Ni layer is formed on the entire surface of the substrate by a plating method.
- the silicon substrate and the metal substrate are bonded to each other and processed at a temperature of 500 ° C. by an RTA method or the like, whereby Ni and Si cause a silicidation reaction to form a silicide layer 1024 to be strong. Bonding is obtained.
- the material that forms the base of the metal substrate is not limited to Cu, but a conductive metal or metal compound having a resistivity of about 100 ⁇ cm or less, such as Au and Ag, which can sufficiently reduce the substrate resistance compared to the high-concentration collector layer. I just need it.
- the diffusion preventing layer is not limited to TaN, and any layer can be used as long as it can prevent diffusion of elements constituting the metal substrate into Si, such as TaSiN, TiN, TiSiN.
- Ni for the bonding material by silicidation is not limited to this, but any material such as Ti, Co, etc. that can cause a silicidation reaction with Si at a low temperature of about 400 to 500 ° C or less, and can bond the substrate.
- the bonded substrate is cut at the interface between the porous silicon portion 1002 and the buffer layer 1003, and the buffer layer is etched away by the RIE method to obtain the structure shown in FIG. 12 (j).
- a photoresist is applied to the surface of the substrate opposite to the metal substrate, and the first element of the photoresist is formed by photolithography.
- An opening 1017 is provided on the boundary between the first element and the second element (Fig. 13 (a)).
- a trench hole is formed in the opening by RIE. The bottom surface of the trench hole reaches from the surface of the semiconductor layer to the back surface and reaches the surface of the silicide layer bonded to the metal substrate, thereby forming the structure shown in FIG.
- the photoresists were removed, then in order to improve the interface characteristics of the isolation region and the semiconductor layer, by a plasma oxidation method using Kr and 0 2 to form 10nm about a Si0 2 to the trench hole's inner wall (Fig. 1 3 ().
- the acid film may be any insulating properties, for example the NH 3 plasma or the like may be used Si 3 N 4 film formed by using a.
- the inside Torre Nchihoru at a temperature of about 400 ° C by CVD Si0 2 filled with 1018 (Fig. 1 3 (d)).
- the Si0 2 formed by CVD may be any insulating properties, for example NH 3 and SiH 4 or the like may be Si 3 N 4 formed by using the. group plate surface Si0 2 Figure 1 3 (e) structure shown in the Ru obtained, for example, by removing by RIE.
- the isolation of the first element and the second element is completed.
- a base electrode 1019 and an emitter electrode 1020 are formed by a method similar to the method described in Example 1, and the inverter device shown in FIG. 13 (f) is completed.
- the collector electrodes of the first and second elements are connected by a metal substrate 1015, so no new wiring is required. Yes.
- the complementary inverter device using bipolar transistors obtained in this manner is manufactured by manufacturing each semiconductor element constituting the inverter device on a single semiconductor substrate, thereby wiring between the semiconductor elements. It can be formed and operated as an integrated circuit.
- the semiconductor layer that forms the semiconductor element uses silicon with ⁇ 110 ⁇ plane orientation, so the diffusion constant of electrons and holes is large, and even if a pnp bipolar transistor is used, the same performance as an npn bipolar transistor Therefore, it has a complementary configuration, and a plurality of elements with reversed polarity are mixed on a single semiconductor substrate. Since the wiring distance is shortened, the parasitic capacitance and parasitic inductance of the wiring can be reduced, and problems such as operation delay and surge voltage can be reduced, thereby providing a semiconductor device that operates at high speed at low cost. I was able to.
- ECL emitter coupling element
- Example 5 a collection using a vertical semiconductor in which wiring layers are formed on both sides of the semiconductor layer.
- the method of forming the product circuit the method of forming the wiring layer on the metal substrate side of the semiconductor layer will be described with reference to FIG.
- an interlayer insulating film is formed on the surface of the substrate.
- Si0 2 1106 is formed at a temperature of about 400 ° C by the CVD method as shown in Fig. 14 (a), so that an interlayer insulating film material exists on the surface of the semiconductor layer.
- the semiconductor layer 1104 in Fig. 14 ( a ) is shown in the drawing as an example, for example, to obtain a force S, a vertical M0SFET, or an IGBT, when a plurality of bipolar transistors are formed on a single substrate. Even if the layer structure is not connected, the essence of this example does not change.
- an opening is provided in the collector electrode portion of the bipolar transistor of the interlayer insulating film 1106 by using a normal photolithography method as shown in FIG.
- patterning is performed so as to leave the interlayer insulating film on the boundary between the first element and the second element.
- the interlayer insulating film on the element boundary functions as an etching stop layer of RIE when element isolation is performed later from the surface of the semiconductor substrate opposite to the metal substrate by the method shown in Example 4. It is.
- Si is 1 ° / in atomic composition.
- the photoresist by pattern Jung by photolithography using a technique such as RIE, after forming the collector electrode 1107, an interlayer insulating film 1108 for example Si0 2 a Film is formed at a temperature of 400 ° C.
- the collector side wiring shown in FIG. 14 (c) is formed.
- a via 1109 for electrically connecting the collector electrode 1107 and the second and subsequent wiring layers and the metal substrate may be formed.
- n + Si 1110 for example, about 10 nm, for example, spack is formed on the entire surface of the collector side of the semiconductor substrate. Deposit by the method. Thereafter, a metal substrate 1111 is bonded to the ⁇ + Si layer.
- the metal substrate may be, for example, a substrate having a Ni surface as shown in Example 4 and is formed by silicidation reaction between the n + Si layer and the Ni layer at a temperature of about 500 ° C. or lower.
- a resided layer 1112 is formed to obtain a strong bond (Fig. 14 (d)).
- the collector-side wiring After forming the collector-side wiring in this manner, bonding to the metal substrate is performed, and then the emitter-side wiring is formed by the method shown in Example 4 so that the wiring is formed on both sides of the semiconductor layer. An integrated circuit using a vertical semiconductor having the same can be obtained.
- ECL emitter coupling element
- a metal substrate is obtained by previously laminating a semiconductor silicon layer having a controlled impurity concentration profile composed of crystals of ⁇ 110 ⁇ plane orientation on a low resistance metal substrate at a low temperature of about 600 ° C. or less. Since the semiconductor layer can be formed on the substrate, there is no problem of substrate breakage in the backside polishing, which has been a problem in the past, and the semiconductor layer can be thinned, so that unnecessary parasitic resistance can be reduced and the device can be driven at high speed.
- the series resistance of the vertical semiconductor device can be reduced by reducing the thickness of the semiconductor layer, which has been about 200 m, to 20 ⁇ m or less.
- the semiconductor silicon layer constituting the semiconductor layer is a crystal having a ⁇ 110 ⁇ plane orientation parallel to the substrate surface, the diffusion constant of electrons or holes is increased, and the current is increased at high speed. Can be turned on or off.
- the semiconductor silicon layer constituting the semiconductor layer is a crystal having a ⁇ 110 ⁇ plane orientation parallel to the substrate surface, the diffusion constant of electrons or holes is increased, and the current is increased at high speed. Can be turned on or off.
- an element isolation region that separates multiple semiconductor elements formed on a single substrate, multiple vertical semiconductor elements are formed on a single substrate, and wiring is formed on both sides of the semiconductor layer.
- the wiring layers can be formed on both surfaces of the vertical semiconductor layer, the vertical semiconductor element impedance that has been obtained only by mounting individual elements on the wiring board can be obtained.
- ECL emitter coupling device
- the semiconductor substrate of the present invention since the semiconductor layer is formed on the metal substrate, the series resistance of the element which has been a problem in the conventional vertical semiconductor element can be sufficiently reduced. The current can be conducted or cut off at high speed. The In addition, since the thermal conductivity of the substrate is improved by using a metal substrate, the heat generation of the element can be removed and the thermal runaway of the element due to the heat generation can be suppressed. Furthermore, according to the semiconductor substrate of the present invention, a plurality of semiconductor layers having different conductivity types or impurity concentrations are formed in advance at a low temperature of about 600 ° C. or less, and the impurity profile can be precisely controlled. Therefore, a high-performance device with a thin base layer or a short channel length can be manufactured with a simple process.
- 0 1 is a Si layer having the first conductivity type.
- 1 0 2 is a Si layer having the second conductivity type.
- 10 3 is a Si layer having a third conductivity type.
- 10 4 is a Si layer having a fourth conductivity type.
- 10 8 is a metal substrate composed of a metal substrate and a connecting metal layer.
- 1 0 7 is a bonding layer.
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| PCT/JP2004/014894 WO2006038305A1 (ja) | 2004-10-01 | 2004-10-01 | 半導体装置およびその製造方法 |
| US11/664,279 US8227912B2 (en) | 2004-10-01 | 2004-10-10 | Semiconductor device with Cu metal-base and manufacturing method thereof |
| US13/529,574 US20120261802A1 (en) | 2004-10-01 | 2012-06-21 | Semiconductor device and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060160030A1 (en) * | 2003-03-24 | 2006-07-20 | Leibiger Steve M | Single polisilicon emitter bipolar junction transistor processing technique using cumulative photo resist application and patterning |
| JP2007288094A (ja) * | 2006-04-20 | 2007-11-01 | Fuji Electric Device Technology Co Ltd | Igbtとそれを駆動するゲート駆動回路 |
| JP5581106B2 (ja) * | 2009-04-27 | 2014-08-27 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法 |
| JP2011151350A (ja) * | 2009-12-22 | 2011-08-04 | Renesas Electronics Corp | 半導体装置の製造方法、及び半導体装置 |
| US8802461B2 (en) | 2011-03-22 | 2014-08-12 | Micron Technology, Inc. | Vertical light emitting devices with nickel silicide bonding and methods of manufacturing |
| US8779555B2 (en) * | 2012-12-06 | 2014-07-15 | Taiwan Semiconductor Manufacturing Co., Ltd. | Partial SOI on power device for breakdown voltage improvement |
| US9698024B2 (en) | 2012-12-06 | 2017-07-04 | Taiwan Semiconductor Manufacturing Co., Ltd. | Partial SOI on power device for breakdown voltage improvement |
| US9443872B2 (en) | 2014-03-07 | 2016-09-13 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
| JP6917700B2 (ja) | 2015-12-02 | 2021-08-11 | 株式会社半導体エネルギー研究所 | 半導体装置 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH038371A (ja) * | 1989-06-05 | 1991-01-16 | Hitachi Ltd | 半導体装置 |
| JPH0442971A (ja) * | 1990-06-07 | 1992-02-13 | Nippondenso Co Ltd | 半導体装置の製造方法 |
| JPH0594928A (ja) * | 1991-10-01 | 1993-04-16 | Toshiba Corp | 半導体基体およびその製造方法とその半導体基体を用いた半導体装置 |
| JPH06252091A (ja) * | 1993-02-24 | 1994-09-09 | Hitachi Ltd | 半導体装置およびその製造方法 |
| JPH09127352A (ja) * | 1995-10-30 | 1997-05-16 | Hitachi Ltd | 半導体装置およびその製造方法 |
| JPH10150176A (ja) * | 1996-11-15 | 1998-06-02 | Tadahiro Omi | 半導体基体とその作製方法 |
| JP2003069019A (ja) * | 2001-08-29 | 2003-03-07 | Toshiba Corp | 半導体装置およびその製造方法 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3877063A (en) | 1973-06-27 | 1975-04-08 | Hewlett Packard Co | Metallization structure and process for semiconductor devices |
| JPS6292361A (ja) * | 1985-10-17 | 1987-04-27 | Toshiba Corp | 相補型半導体装置 |
| JPH04283914A (ja) | 1991-03-12 | 1992-10-08 | Fujitsu Ltd | 貼り合わせ半導体基板とその製造方法 |
| JP3119384B2 (ja) | 1992-01-31 | 2000-12-18 | キヤノン株式会社 | 半導体基板及びその作製方法 |
| JP3191972B2 (ja) | 1992-01-31 | 2001-07-23 | キヤノン株式会社 | 半導体基板の作製方法及び半導体基板 |
| JPH05218036A (ja) | 1992-02-04 | 1993-08-27 | Fujitsu Ltd | 半導体装置 |
| JP3270985B2 (ja) | 1995-03-17 | 2002-04-02 | 株式会社日立製作所 | 半導体装置の製造方法 |
| DE19734434C1 (de) * | 1997-08-08 | 1998-12-10 | Siemens Ag | Halbleiterkörper mit Rückseitenmetallisierung und Verfahren zu deren Herstellung |
| US6079928A (en) | 1997-08-08 | 2000-06-27 | Brooks Automation, Inc. | Dual plate gas assisted heater module |
| US6544880B1 (en) * | 1999-06-14 | 2003-04-08 | Micron Technology, Inc. | Method of improving copper interconnects of semiconductor devices for bonding |
| JP4105353B2 (ja) * | 1999-07-26 | 2008-06-25 | 財団法人国際科学振興財団 | 半導体装置 |
| US20020187619A1 (en) * | 2001-05-04 | 2002-12-12 | International Business Machines Corporation | Gettering process for bonded SOI wafers |
| TWI283031B (en) * | 2002-03-25 | 2007-06-21 | Epistar Corp | Method for integrating compound semiconductor with substrate of high thermal conductivity |
| JP3959695B2 (ja) * | 2003-01-14 | 2007-08-15 | 松下電器産業株式会社 | 半導体集積回路 |
-
2004
- 2004-10-01 WO PCT/JP2004/014894 patent/WO2006038305A1/ja not_active Ceased
- 2004-10-10 US US11/664,279 patent/US8227912B2/en not_active Expired - Fee Related
-
2012
- 2012-06-21 US US13/529,574 patent/US20120261802A1/en not_active Abandoned
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH038371A (ja) * | 1989-06-05 | 1991-01-16 | Hitachi Ltd | 半導体装置 |
| JPH0442971A (ja) * | 1990-06-07 | 1992-02-13 | Nippondenso Co Ltd | 半導体装置の製造方法 |
| JPH0594928A (ja) * | 1991-10-01 | 1993-04-16 | Toshiba Corp | 半導体基体およびその製造方法とその半導体基体を用いた半導体装置 |
| JPH06252091A (ja) * | 1993-02-24 | 1994-09-09 | Hitachi Ltd | 半導体装置およびその製造方法 |
| JPH09127352A (ja) * | 1995-10-30 | 1997-05-16 | Hitachi Ltd | 半導体装置およびその製造方法 |
| JPH10150176A (ja) * | 1996-11-15 | 1998-06-02 | Tadahiro Omi | 半導体基体とその作製方法 |
| JP2003069019A (ja) * | 2001-08-29 | 2003-03-07 | Toshiba Corp | 半導体装置およびその製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| US8227912B2 (en) | 2012-07-24 |
| US20120261802A1 (en) | 2012-10-18 |
| US20070252243A1 (en) | 2007-11-01 |
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