WO2021171969A1 - 半導体集積回路装置 - Google Patents
半導体集積回路装置 Download PDFInfo
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- WO2021171969A1 WO2021171969A1 PCT/JP2021/004379 JP2021004379W WO2021171969A1 WO 2021171969 A1 WO2021171969 A1 WO 2021171969A1 JP 2021004379 W JP2021004379 W JP 2021004379W WO 2021171969 A1 WO2021171969 A1 WO 2021171969A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D84/00—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers
- H10D84/80—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers characterised by the integration of at least one component covered by groups H10D12/00 or H10D30/00, e.g. integration of IGFETs
- H10D84/811—Combinations of field-effect devices and one or more diodes, capacitors or resistors
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/41—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming static cells with positive feedback, i.e. cells not needing refreshing or charge regeneration, e.g. bistable multivibrator or Schmitt trigger
- G11C11/412—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming static cells with positive feedback, i.e. cells not needing refreshing or charge regeneration, e.g. bistable multivibrator or Schmitt trigger using field-effect transistors only
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B10/00—Static random access memory [SRAM] devices
- H10B10/12—Static random access memory [SRAM] devices comprising a MOSFET load element
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/40—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels
- H10D30/43—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels having 1D charge carrier gas channels, e.g. quantum wire FETs or transistors having 1D quantum-confined channels
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
- H10D62/117—Shapes of semiconductor bodies
- H10D62/118—Nanostructure semiconductor bodies
- H10D62/119—Nanowire, nanosheet or nanotube semiconductor bodies
- H10D62/121—Nanowire, nanosheet or nanotube semiconductor bodies oriented parallel to substrates
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D84/00—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers
- H10D84/80—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers characterised by the integration of at least one component covered by groups H10D12/00 or H10D30/00, e.g. integration of IGFETs
- H10D84/82—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers characterised by the integration of at least one component covered by groups H10D12/00 or H10D30/00, e.g. integration of IGFETs of only field-effect components
- H10D84/83—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers characterised by the integration of at least one component covered by groups H10D12/00 or H10D30/00, e.g. integration of IGFETs of only field-effect components of only insulated-gate FETs [IGFET]
- H10D84/85—Complementary IGFETs, e.g. CMOS
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D84/00—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers
- H10D84/90—Masterslice integrated circuits
- H10D84/903—Masterslice integrated circuits comprising field effect technology
- H10D84/907—CMOS gate arrays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D89/00—Aspects of integrated devices not covered by groups H10D84/00 - H10D88/00
- H10D89/10—Integrated device layouts
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- H10W20/427—
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D84/00—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers
- H10D84/90—Masterslice integrated circuits
- H10D84/903—Masterslice integrated circuits comprising field effect technology
- H10D84/907—CMOS gate arrays
- H10D84/968—Macro-architecture
- H10D84/974—Layout specifications, i.e. inner core regions
- H10D84/981—Power supply lines
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- H10W20/20—
Definitions
- the present disclosure relates to a semiconductor integrated circuit device provided with a nanosheet (nanowire) FET (Field Effect Transistor).
- nanosheet nanowire
- FET Field Effect Transistor
- the standard cell method is known as a method for forming a semiconductor integrated circuit on a semiconductor substrate.
- a basic unit having a specific logical function for example, an inverter, a latch, a flip-flop, a full adder, etc.
- a plurality of standard cells are arranged on a semiconductor substrate. Then, it is a method of designing an LSI chip by connecting these standard cells with wiring.
- the transistor which is a basic component of the LSI, has realized an improvement in the degree of integration, a reduction in the operating voltage, and an improvement in the operating speed by reducing (scaling) the gate length.
- off-current due to excessive scaling and a significant increase in power consumption due to the off-current have become problems.
- three-dimensional structure transistors in which the transistor structure is changed from the conventional two-dimensional type to the three-dimensional type are being actively studied. As one of them, nanosheet (nanowire) FETs are attracting attention.
- Non-Patent Documents 1 and 2 disclose the layout of a SRAM memory cell and a standard cell using a nanosheet FET having a fork-shaped gate electrode.
- a nanosheet FET having a fork-shaped gate electrode is referred to as a forksheet FET, following the description in Non-Patent Document 1.
- An object of the present disclosure is to provide a layout structure of a capacitance cell using a fork sheet FET.
- a semiconductor integrated circuit device including a standard cell which is a capacitance cell, wherein the standard cell has a P-type region in which a P-type transistor is formed and an N-type region in which an N-type transistor is formed.
- the standard cell has a P-type region in which a P-type transistor is formed and an N-type region in which an N-type transistor is formed.
- the standard cell has a P-type region in which a P-type transistor is formed and an N-type region in which an N-type transistor is formed.
- the standard cell has a P-type region in which a P-type transistor is formed and an N-type region in which an N-type transistor is formed.
- the first pad pair and the second gate wiring are provided with a first power supply voltage, and the second pad pair and the first gate wiring have a second power supply voltage lower than the first power supply voltage.
- the first nanosheet portion and the second nanosheet portion face each other in the first direction, and among the nanosheets possessed by the first nanosheet portion, the nanosheet closest to the second nanosheet portion.
- the surface of the second nanosheet portion in the first direction is exposed from the first gate wiring, and among the nanosheets of the second nanosheet portion, the nanosheet closest to the first nanosheet portion is the first nanosheet.
- the surface on the side of the first nanosheet portion in one direction is exposed from the second gate wiring.
- the first nanosheet portion since the first power supply voltage is applied to the first pad pair and the second gate wiring and the second power supply voltage is applied to the second pad pair and the first gate wiring, the first nanosheet portion.
- a capacitance is generated between the first gate wiring and the second nanosheet portion and the second gate wiring.
- capacitance is also generated between the first gate wiring and the second gate wiring, and between the first pad pair and the second pad pair.
- the nanosheet closest to the second nanosheet portion among the nanosheets possessed by the first nanosheet portion has a surface on the side of the second nanosheet portion exposed from the first gate wiring, and the first nanosheet among the nanosheets possessed by the second nanosheet portion. In the nanosheet closest to the nanosheet portion, the surface on the first nanosheet side is exposed from the second gate wiring.
- the distance between the first nanosheet portion and the second nanosheet portion can be narrowed, so that the area of the capacity cell can be further reduced. Further, a larger capacity can be realized between the first gate wiring and the second gate wiring, and between the first pad pair and the second pad pair.
- the semiconductor integrated circuit device includes a standard cell which is a capacitance cell, and the standard cell is formed with a first region in which a first conductive transistor is formed and a second conductive transistor.
- the second region is formed adjacent to each other in the first direction, and extends in the second direction perpendicular to the first direction in the first region, or in the first direction.
- a second nanosheet portion composed of two or more nanosheets arranged side by side and one or two or more nanosheets arranged in the first direction extending in the second direction in the second region.
- a pair of pads is provided, the first and second gate wirings are provided with a first power supply voltage, and the first and second pad pairs are provided with a second power supply voltage different from the first power supply voltage.
- the nanosheets that are opposed to each other in the first direction and that are closest to the second nanosheet portion among the nanosheets that the first nanosheet portion has are the nanosheets that are closest to the second nanosheet portion.
- the surface of the second nanosheet portion in the first direction is exposed from the first gate wiring, and among the nanosheets of the second nanosheet portion, the nanosheet closest to the first nanosheet portion is in the first direction.
- the surface on the side of the first nanosheet portion is exposed from the second gate wiring.
- the first nanosheet portion and the first gate A capacitance is generated between the wiring or between the second nanosheet portion and the second gate wiring.
- the nanosheet closest to the second nanosheet portion among the nanosheets possessed by the first nanosheet portion has a surface on the side of the second nanosheet portion exposed from the first gate wiring, and the first nanosheet among the nanosheets possessed by the second nanosheet portion. In the nanosheet closest to the nanosheet portion, the surface on the first nanosheet portion side is exposed from the second gate wiring. As a result, the distance between the first nanosheet portion and the second nanosheet portion can be narrowed, so that the area of the capacity cell can be further reduced.
- a layout structure of a large-capacity capacity cell using a fork sheet FET can be realized.
- FIGS. 1 to 3 are cross-sectional views showing the layout structure of the capacity cell according to the modified example of the first embodiment.
- (A) and (b) are cross-sectional views of the layout structure of FIG. 6 in the vertical direction in a plan view. Circuit diagram of the capacitance cell shown in FIGS.
- Top view showing layout structure of capacity cell which concerns on modification 2 of 2nd Embodiment Circuit diagram of the capacitance cell shown in FIG. It is a figure which shows the basic structure of a fork sheet FET, (a) is a plan view, (b) is a sectional view.
- the semiconductor integrated circuit apparatus includes a plurality of standard cells (in the present specification, as appropriate, simply referred to as cells), and at least a part of the plurality of standard cells is a nanosheet FET (Field). Effect Transistor) shall be provided.
- the nanosheet FET is an FET using a thin sheet (nanosheet) through which an electric current flows. Nanosheets are made of, for example, silicon. Then, in the semiconductor integrated circuit device, a part of the nanosheet FET is a fork-sheet FET having a fork-shaped gate electrode.
- the semiconductor layer portion formed at both ends of the nanosheet and forming the terminal serving as the source or drain of the nanosheet FET is referred to as a "pad".
- FIG. 13 is a diagram showing the basic structure of the fork sheet FET, (a) is a plan view, and (b) is a cross-sectional view taken along the line YY'of (a).
- two transistors TR1 and TR2 are arranged side by side with an interval S in the Y direction.
- the gate wiring 531 that serves as the gate of the transistor TR1 and the gate wiring 532 that serves as the gate of the transistor TR2 both extend in the Y direction and are arranged at the same position in the X direction.
- the channel portion 521 which is the channel region of the transistor TR1 and the channel portion 526 which is the channel region of the transistor TR2 are composed of nanosheets.
- each of the channel portions 521 and 526 is composed of nanosheets having a three-sheet structure that overlaps in a plan view.
- Pads 522a and 522b serving as a source region or a drain region of the transistor TR1 are formed on both sides of the channel portion 521 in the X direction.
- Pads 527a and 527b serving as a source region or a drain region of the transistor TR2 are formed on both sides of the channel portion 526 in the X direction.
- the pads 522a and 522b are formed by epitaxial growth from the nanosheets constituting the channel portion 521.
- the pads 527a and 527b are formed by epitaxial growth from the nanosheets constituting the channel portion 526.
- the gate wiring 531 surrounds the outer circumference of the channel portion 521 made of nanosheets in the Y direction and the Z direction via a gate insulating film (not shown). However, in the nanosheet constituting the channel portion 521, the surface on the side of the transistor TR2 in the Y direction is not covered by the gate wiring 531 and is exposed from the gate wiring 531. That is, in the cross-sectional view of FIG. 13B, the gate wiring 531 does not cover the right side of the drawing of the nanosheet constituting the channel portion 521, but covers the upper side, the left side, and the lower side of the drawing. The gate wiring 531 overlaps the nanosheet constituting the channel portion 521 on the opposite side of the transistor TR2 in the Y direction by the length OL.
- the gate wiring 532 surrounds the outer circumference of the channel portion 526 made of nanosheets in the Y and Z directions via a gate insulating film (not shown). However, in the nanosheet constituting the channel portion 526, the surface on the side of the transistor TR1 in the Y direction is not covered by the gate wiring 532 and is exposed from the gate wiring 532. That is, in the cross-sectional view of FIG. 13B, the gate wiring 532 does not cover the left side of the drawing of the nanosheet constituting the channel portion 526, but covers the upper side, the right side, and the lower side of the drawing. The gate wiring 532 overlaps the nanosheet constituting the channel portion 526 on the opposite side of the transistor TR1 in the Y direction by the length OL.
- the effective gate width Weff 2 ⁇ W + H Will be. Since the channel portions 521 and 526 of the transistors TR1 and TR2 are composed of three nanosheets, the gate effective width of the transistors TR1 and TR2 is determined. 3x (2xW + H) Will be.
- the gate wiring 531 does not overlap the nanosheet constituting the channel portion 521 on the side of the transistor TR2 in the Y direction. Further, the gate wiring 532 does not overlap with the nanosheet constituting the channel portion 526 on the side of the transistor TR1 in the Y direction. As a result, the transistors TR1 and TR2 can be brought closer to each other, and the area can be reduced.
- the number of nanosheets constituting the channel portion of the transistor is not limited to three. That is, the nanosheet may have a single sheet structure, or may have a plurality of overlapping sheet structures in a plan view. Further, in FIG. 13B, the cross-sectional shape of the nanosheet is shown as a rectangle, but the cross-sectional shape of the nanosheet is not limited to this, and the cross-sectional shape of the nanosheet may be, for example, a square, a circle, an ellipse, or the like. ..
- the fork sheet FET and the nano sheet FET in which the gate wiring surrounds the entire circumference of the nano sheet may be mixed in the semiconductor integrated circuit device.
- VDD and VVSS indicate the power supply voltage or the power supply itself.
- expressions such as “same wiring width” that mean that the widths and the like are the same include a range of variations in manufacturing.
- FIGS. 3 (a) to 3 (c) are cross-sectional views in the vertical direction in a plan view.
- FIG. 2A is a cross section of line X1-X1'
- FIG. 2B is a cross section of line X2-X2'.
- FIG. 3A is a cross section of line Y1-Y1'
- FIG. 3B is a cross section of line Y2-Y2'
- FIG. 3C is a cross section of line Y3-Y3'.
- the horizontal direction of the drawing is the X direction (corresponding to the second direction)
- the vertical direction of the drawing is the Y direction (corresponding to the first direction)
- the direction perpendicular to the substrate surface is defined. It is in the Z direction (corresponding to the third direction).
- FIG. 4 is a circuit diagram of the capacitance cell shown in FIGS. 1 to 3.
- the capacitance cells shown in FIGS. 1 to 3 include P-type transistors P1, P2, P3, P4, P5 and N-type transistors N1, N2, N3, N4, N5.
- Transistors P2 to P4 and transistors N2 to N4 function as capacitances.
- the transistor P1 and the transistor N5 form a fixed value output unit 5.
- the fixed value output unit 5 outputs a low fixed value (VSS) to the node X1 and outputs a high fixed value (VDD) to the node X2.
- the source is connected to VDD
- the drain is connected to the gate of transistor N5, and the gate is connected to the drain of transistor N5.
- the source of transistor N5 is connected to VSS, and the drain of transistor N5 is connected to the gate of transistor P1.
- the gate of the transistor P1 corresponds to the node X1, and the gate of the transistor N5 corresponds to the node
- the transistor P5 and the transistor N1 are transistors in the off state.
- the transistor P5 and the transistor N1 may not be provided, but if there is one, the regularity of the layout of the capacitance cell is improved, so that the ease of manufacturing the device is improved, the yield is improved, and the yield is improved. Manufacturing variations are suppressed.
- the source and drain are connected to VDD, and the gate is connected to node X1. Since the VSS is output from the fixed value output unit 5 to the node X1, the transistors P2 to P4 function as capacitances.
- the source and drain are connected to VSS, and the gate is connected to node X2. Since VDD is output from the fixed value output unit 5 to the node X2, the transistors N2 to N4 function as capacitances.
- the capacity cells of FIGS. 1 to 3 are arranged side by side in the X direction in contact with the cell frame CL together with other standard cells to form a cell row. Further, the plurality of cell rows are arranged side by side in the Y direction in contact with the cell frame CL. However, the plurality of cell columns are flipped upside down every other column.
- power supply wirings 11 and 12 extending in the X direction are provided at both ends of the capacitance cell in the Y direction, respectively.
- Both the power supply wirings 11 and 12 are embedded power supply wirings (BPR: Buried Power Rail) formed in the embedded wiring layer.
- the power supply wiring 11 supplies the power supply voltage VDD
- the power supply wiring 12 supplies the power supply voltage VSS.
- the power supply wirings 11 and 12 are shared with other cells in the cell row including the capacitance cell, and become power supply wirings extending in the X direction. Further, the power supply wirings 11 and 12 constitute power supply wirings arranged between cell rows adjacent to each other in the Y direction.
- P-type transistors P1, P2, P3, P4, P5 are formed in the P-type region on the N-well.
- N-type transistors N1, N2, N3, N4, N5 are formed in the N-type region on the P-type substrate.
- the P-type region and the N-type region are formed adjacent to each other in the Y direction.
- the arrangement positions of the transistors P1, P2, P3, P4 and P5 are the same as the arrangement positions of the transistors N1, N2, N3, N4 and N5, respectively. That is, the transistors P1 and N1 are arranged in a row in the Y direction.
- the transistors P2 and N2 are arranged in a row in the Y direction.
- the transistors P3 and N3 are arranged in a row in the Y direction.
- the transistors P4 and N4 are arranged in a row in the Y direction.
- the transistors P5 and N5 are arranged in a row in the Y direction.
- the transistors P1, P2, P3, P4, and P5 each have nanosheets 21a, 21b, 21c, 21d, and 21e having a three-sheet structure that overlaps in a plan view as a channel portion. That is, the transistors P1, P2, P3, P4, and P5 are nanosheet FETs.
- Pads 22a, 22b, 22c, 22d, 22e, and 22f each of an integral semiconductor layer connected to a three-sheet structure are formed.
- the pads 22a and 22b serve as a source region and a drain region of the transistor P1.
- the pads 22b and 22c serve as a source region and a drain region of the transistor P2.
- the pads 22c and 22d serve as a source region and a drain region of the transistor P3.
- the pads 22d and 22e serve as a source region and a drain region of the transistor P4.
- the pads 22e and 22f serve as a source region and a drain region of the transistor P5.
- the transistors N1, N2, N3, N4, and N5 have nanosheets 26a, 26b, 26c, 26d, and 26e each having a three-sheet structure overlapping in a plan view as a channel portion. That is, the transistors N1, N2, N3, N4, and N5 are nanosheet FETs.
- Pads 27a, 27b, 27c, 27d, 27e, and 27f each of an integral semiconductor layer connected to a three-sheet structure are formed.
- the pads 27a and 27b serve as a source region and a drain region of the transistor N1.
- the pads 27b and 27c serve as a source region and a drain region of the transistor N2.
- the pads 27c and 27d serve as a source region and a drain region of the transistor N3.
- the pads 27d and 27e serve as a source region and a drain region of the transistor N4.
- the pads 27e and 27f serve as a source region and a drain region of the transistor N5.
- Gate wirings 31a, 31b, 31c, 31d, 31e extending in parallel in the Y direction are formed in the P-shaped region.
- the gate wirings 31a, 31b, 31c, 31d, 31e are formed with the same width and are arranged at the same pitch.
- Gate wirings 36a, 36b, 36c, 36d, 36e extending in parallel in the Y direction are formed in the N-type region.
- the gate wirings 36a, 36b, 36c, 36d, 36e are formed with the same width and are arranged at the same pitch.
- the arrangement positions of the gate wirings 31a, 31b, 31c, 31d, 31e are the same as the arrangement positions of the gate wirings 36a, 36b, 36c, 36d, 36e, respectively. That is, the gate wirings 31a and 36a are arranged in a row in the Y direction. The gate wirings 31b and 36b are arranged in a row in the Y direction. The gate wirings 31c and 36c are arranged in a row in the Y direction. The gate wirings 31d and 36d are arranged in a row in the Y direction. The gate wirings 31e and 36e are arranged in a row in the Y direction. Dummy gate wirings 38a and 38b are formed on the cell frames CL on both sides in the X direction.
- the gate wiring 31a surrounds the outer periphery of the nanosheet 21a of the transistor P1 in the Y direction and the Z direction via a gate insulating film (not shown).
- the gate wiring 31a serves as a gate for the transistor P1.
- the gate wirings 31b, 31c, 31d, and 31e have a gate insulating film (not shown) around the outer circumferences of the transistors P2, P3, P4, and P5 in the Y and Z directions of the nanosheets 21b, 21c, 21d, and 21e, respectively. ) Is enclosed.
- the gate wirings 31b, 31c, 31d, and 31e serve as gates for the transistors P2, P3, P4, and P5, respectively.
- the gate wiring 36a surrounds the outer periphery of the nanosheet 26a of the transistor N1 in the Y direction and the Z direction via a gate insulating film (not shown).
- the gate wiring 36a serves as a gate for the transistor N1.
- the gate wiring 36b, 36c, 36d, 36e the outer circumferences of the nanosheets 26b, 26c, 26d, 26e of the transistors N2, N3, N4, N5 in the Y direction and the Z direction, respectively, are covered with a gate insulating film (not shown). ) Is enclosed.
- the gate wirings 36b, 36c, 36d, and 36e serve as gates for transistors N2, N3, N4, and N5, respectively.
- the gate wirings 31a and 36a arranged in the Y direction are connected via a bridge portion 33a formed between the gate wiring 31a and the gate wiring 36a.
- the gate wirings 31e and 36e arranged in the Y direction are connected via a bridge portion 33b formed between the gate wiring 31e and the gate wiring 36e.
- Local wirings 41, 42, 43a, 43b, 43c, 43d, 44a, 44b, 44c, 44d extending in the Y direction are formed on the local wiring layer.
- the local wiring 41 is connected to the pads 22a and 27a.
- the local wiring 42 is connected to the pads 22f and 27f.
- the local wirings 43a, 43b, 43c, 43d are connected to the pads 22b, 22c, 22d, 22e, respectively, and are connected to the power supply wiring 11 via via vias.
- the local wirings 44a, 44b, 44c, 44d are connected to the pads 27b, 27c, 27d, 27e, respectively, and are connected to the power supply wiring 12 via vias.
- metal wirings 51, 52, 53, 54 extending in the X direction are formed.
- the metal wirings 52 and 54 correspond to the nodes X1 of the circuit, and the metal wirings 51 and 53 correspond to the nodes X2 of the circuit.
- the metal wiring 51 is connected to the gate wiring 31e via vias, and is connected to the local wiring 41 via vias.
- the metal wiring 52 is connected to the gate wirings 31a, 31b, 31c, 31d via vias, and is connected to the local wiring 42 via vias.
- the metal wiring 53 is connected to the gate wirings 36b, 36c, 36d, 36e via vias, and is connected to the local wirings 41 via via vias.
- the metal wiring 54 is connected to the gate wiring 36a and is connected to the local wiring 42 via via vias.
- the metal wirings 51, 52, 53, 54 form an inter-wiring capacitance.
- the nanosheet 21a and the nanosheet 26a face each other in the Y direction.
- the surface of the nanosheet 21a on the nanosheet 26a side in the Y direction is not covered by the gate wiring 31a and is exposed from the gate wiring 31a.
- the surface of the nanosheet 26a on the nanosheet 21a side in the Y direction is not covered by the gate wiring 36a and is exposed from the gate wiring 36a.
- the nanosheet 21b and the nanosheet 26b face each other in the Y direction
- the nanosheet 21c and the nanosheet 26c face each other in the Y direction
- the nanosheet 21d and the nanosheet 26d face each other in the Y direction
- the nanosheet 21e And the nanosheet 26e face each other in the Y direction.
- the surfaces of the nanosheets 21b, 21c, 21d, and 21e on the nanosheets 26b, 26c, 26d, and 26e in the Y direction are not covered by the gate wirings 31b, 31c, 31d, and 31e, respectively, and the gate wirings 31b, It is exposed from 31c, 31d, and 31e.
- the surfaces on the nanosheets 21b, 21c, 21d, 21e side in the Y direction are not covered by the gate wirings 36b, 36c, 36d, 36e, and the gate wirings 36b, 36c, 36d, It is exposed from 36e.
- the focus is on the transistor P3, which functions as a capacitance.
- the gate wiring 31c serving as the gate is given VSS from the node X1, and the pads 22c and 22d serving as the source / drain are given VDD via the local wirings 43b and 43c. Therefore, a capacitance is generated to sandwich the gate oxide film of the transistor P3. In addition to this, capacity is generated in the following places. 1) Between the pads 22c and 22d and the gate wiring 31c (see FIG. 2A). 2) Between the local wirings 43b and 43c and the gate wiring 31c (see FIG. 2A). 3) Between the gate wiring 31c and the gate wiring 36c of the transistor N3 (see FIG. 3A).
- the gate wiring 36c is given VDD from the node X2. 4) Between the pads 22c and 22d and the pads 27c and 27d of the transistor N3 (see FIG. 3B). VSS is given to the pads 27c and 27d via the local wirings 44b and 44c. 5) Between the local wirings 43b and 43c and the local wirings 44b and 44c (see FIG. 3B).
- the surface of the transistor P3 on the nanosheet 26c side of the transistor P3 is not covered with the gate wiring 31c, and the surface of the transistor N3 on the nanosheet 21c side of the transistor N3 is not covered by the gate wiring 31c. Is not covered by the gate wiring 36c. As a result, the distance between the transistor P3 and the transistor N3 is shortened. Therefore, the capacities of 3) and 4) above become larger.
- a capacitance is generated between the nanosheets 21b, 21c, 21d and the gate wirings 31b, 31c, 31d for the transistors P2, P3, P4.
- a capacitance is generated between the nanosheets 26b, 26c, 26d and the gate wirings 36b, 36c, 36d.
- the surfaces of the nanosheets 21b, 21c, 21d on the nanosheets 26b, 26c, 26d side are exposed from the gate wirings 31b, 31c, 31d, and the nanosheets 26b, 26c, 26d are the surfaces on the nanosheets 21b, 21c, 21d side. Is exposed from the gate wirings 36b, 36c, 36d.
- the distance between the nanosheets 21b, 21c, 21d and the nanosheets 26b, 26c, 26d can be narrowed, so that the area of the capacity cell can be further reduced.
- a larger capacitance can be realized between the gate wiring 31c and the gate wiring 36c, and between the pad pairs 22c and 22d and the pad pairs 27c and 27d.
- the fixed value output unit may be omitted in the above-described embodiment.
- the capacitance cell may be configured so that VSS is directly supplied to the gates of the transistors P2, P3 and P4 and VDD is directly supplied to the gates of the transistors N2, N3 and N4.
- the number of transistors constituting the capacitance is 3 each for P type and N type, but the number of transistors constituting the capacitance is not limited to this.
- one nanosheet is arranged in the Y direction in each transistor, but two or more nanosheets may be arranged in the Y direction.
- the surface on the second nanosheet portion side in the direction is exposed from the gate wiring, and among the nanosheets possessed by the second nanosheet portion, the nanosheet closest to the first nanosheet portion has the surface on the first nanosheet side in the Y direction from the gate wiring. It suffices if it is exposed. As a result, the same effect as that of the above-described embodiment can be obtained.
- 5 (a) and 5 (b) are cross-sectional views in the vertical direction in a plan view showing the configuration of this modified example.
- the transistor P3 has two nanosheets 21c and 23c arranged in the Y direction
- the transistor N3 has two nanosheets 26c and 28c arranged in the Y direction.
- Pads 24d, 22d, 27d, and 29d are formed on one side of the nanosheets 21c, 23c, 26c, and 28c in the X direction, respectively.
- the surface of the nanosheet 21c on the nanosheet 26c side in the Y direction is not covered by the gate wiring 31c and is exposed from the gate wiring 31c.
- the surface on the nanosheet 21c side in the Y direction is not covered by the gate wiring 36c and is exposed from the gate wiring 36c.
- the nanosheet 21c closest to the second nanosheet portion 25 among the nanosheets possessed by the first nanosheet portion 24 is The surface of the second nanosheet portion 25 in the Y direction is exposed from the gate wiring 31c, and among the nanosheets of the second nanosheet portion 25, the nanosheet 26c closest to the first nanosheet portion 24 is the first nanosheet portion in the Y direction. The surface on the 24 side is exposed from the gate wiring 36c.
- FIGS. 6 and 7 are views showing an example of the layout structure of the capacity cell according to the second embodiment
- FIG. 6 is a plan view
- FIG. 7 is a cross-sectional view in the vertical direction in a plan view
- FIG. 7A is a cross section of line Y4-Y4'
- FIG. 7B is a cross section of line Y5-Y5'.
- the layout structure shown in FIGS. 6 and 7 is similar to the layout structure shown in FIGS. 1 to 3, and the same applies to, for example, the power supply wiring and the arrangement of the nanosheets and pads of the transistors. In the following description, the description of the same configuration as that of the first embodiment may be omitted.
- FIG. 8 is a circuit diagram of the capacitance cell shown in FIGS. 6 and 7.
- the cells shown in FIGS. 6 and 7 have P-type transistors P1, P2, P3, P4, P5 and N-type transistors N1, N2, N3, N4, N5.
- Transistors N2 to N4 function as capacitances.
- the transistor P5 and the transistor N1 form a fixed value output unit 5.
- the fixed value output unit 5 outputs a high fixed value (VDD) to the node X1 and outputs a low fixed value (VSS) to the node X2.
- VDD high fixed value
- VSS low fixed value
- the source is connected to VDD
- the drain is connected to the gate of transistor N1
- the source of transistor N1 is connected to VSS
- the drain of transistor N1 is connected to the gate of transistor P5.
- the gate of the transistor N1 corresponds to the node X1, and the gate of the transistor P5 corresponds to the node X2.
- the transistors P1 to P4 and the transistor N5 are transistors in the off state.
- Transistors P1 to P4 and transistors N5 may not be included in the circuit configuration of the capacitive cell, but if they are present, the regularity of the layout of the capacitive cell is improved, so that the ease of manufacturing the device is improved and the yield is improved. However, manufacturing variations are suppressed.
- the source and drain are connected to VSS, and the gate is connected to node X1. Since VDD is output from the fixed value output unit 5 to the node X1, the transistors N2 to N4 function as capacitances.
- gate wirings 131a, 131b, 131c, 131d, 131e extending in parallel in the Y direction are formed in the P-shaped region.
- the gate wirings 131a, 131b, 131c, 131d, 131e are formed with the same width and are arranged at the same pitch.
- Gate wirings 136a, 136b, 136c, 136d, 136e extending in parallel in the Y direction are formed in the N-type region.
- the gate wirings 136a, 136b, 136c, 136d, 136e are formed with the same width and are arranged at the same pitch.
- the arrangement positions of the gate wirings 131a, 131b, 131c, 131d, 131e are the same as the arrangement positions of the gate wirings 136a, 136b, 136c, 136d, 136e, respectively. That is, the gate wirings 131a and 136a are arranged in a row in the Y direction. The gate wirings 131b and 136b are arranged in a row in the Y direction. The gate wirings 131c and 136c are arranged in a row in the Y direction. The gate wirings 131d and 136d are arranged in a row in the Y direction. The gate wirings 131e and 136e are arranged in a row in the Y direction.
- the gate wiring 131a surrounds the outer periphery of the nanosheet 21a of the transistor P1 in the Y direction and the Z direction via a gate insulating film (not shown).
- the gate wiring 131a serves as a gate for the transistor P1.
- the gate wirings 131b, 131c, 131d, 131e have a gate insulating film (not shown) around the outer circumferences of the transistors P2, P3, P4, and P5 in the Y and Z directions of the nanosheets 21b, 21c, 21d, and 21e, respectively. ) Is enclosed.
- the gate wirings 131b, 131c, 131d, and 131e serve as gates for transistors P2, P3, P4, and P5, respectively.
- the gate wiring 136a surrounds the outer periphery of the nanosheet 26a of the transistor N1 in the Y direction and the Z direction via a gate insulating film (not shown).
- the gate wiring 136a serves as a gate for the transistor N1.
- the gate wiring 136b, 136c, 136d, 136e the outer circumferences of the nanosheets 26b, 26c, 26d, 26e of the transistors N2, N3, N4, N5 in the Y direction and the Z direction are covered with a gate insulating film (not shown). ) Is enclosed.
- the gate wirings 136b, 136c, 136d, and 136e serve as gates for transistors N2, N3, N4, and N5, respectively.
- the gate wirings 131a and 136a arranged in the Y direction are connected via a bridge portion 133a formed between the gate wiring 131a and the gate wiring 136a.
- the gate wirings 131b and 136b arranged in the Y direction are connected via a bridge portion 133b formed between the gate wiring 131b and the gate wiring 136b.
- the gate wirings 131c and 136c arranged in the Y direction are connected via a bridge portion 133c formed between the gate wiring 131c and the gate wiring 136c.
- the gate wirings 131d and 136d arranged in the Y direction are connected via a bridge portion 133d formed between the gate wiring 131d and the gate wiring 136d.
- the gate wirings 131e and 136e arranged in the Y direction are connected via a bridge portion 133e formed between the gate wiring 131e and the gate wiring 136e.
- the local wiring 141, 142, 143, 144, 145, 146, 147, 148 extending in the Y direction is formed in the local wiring layer.
- the local wiring 141 is connected to the pads 22a and 27a.
- the local wiring 142 is connected to the pads 22b and 27b, and is also connected to the power supply wiring 12 via vias.
- the local wiring 143 is connected to the pads 22c and 27c, and is connected to the power supply wiring 12 via vias.
- the local wiring 144 is connected to the pads 22d and 27d, and is connected to the power supply wiring 12 via vias.
- the local wiring 145 is connected to the pad 22e.
- the local wiring 146 is connected to the pad 22f and is connected to the power supply wiring 11 via vias.
- the local wiring 147 is connected to the pad 27e and is connected to the power supply wiring 12.
- the local wiring 148 is connected to the pad 27f.
- metal wirings 151, 152, 153, 154 extending in the X direction are formed.
- the metal wirings 152 and 154 correspond to the nodes X1 of the circuit, and the metal wirings 151 and 153 correspond to the nodes X2 of the circuit.
- the metal wiring 151 is connected to the gate wiring 131e via vias, and is connected to the local wiring 141 via vias.
- the metal wiring 152 is connected to the gate wirings 131a, 131b, 131c, 131d via vias, and is connected to the local wirings 145 via vias.
- the metal wiring 153 is connected to the gate wiring 136e via vias, and is connected to the local wiring 141 via vias.
- the metal wiring 154 is connected to the gate wirings 136a, 136b, 136c, 136d via vias, and is connected to the local wirings 148 via vias.
- the nanosheet 21a and the nanosheet 26a face each other in the Y direction.
- the surface of the nanosheet 21a on the nanosheet 26a side in the Y direction is not covered by the gate wiring 131a and is exposed from the gate wiring 131a.
- the surface of the nanosheet 26a on the nanosheet 21a side in the Y direction is not covered by the gate wiring 136a and is exposed from the gate wiring 136a.
- the nanosheet 21b and the nanosheet 26b face each other in the Y direction.
- the nanosheet 21c and the nanosheet 26c face each other in the Y direction.
- the nanosheet 21d and the nanosheet 26d face each other in the Y direction.
- the nanosheet 21e and the nanosheet 26e face each other in the Y direction.
- the surfaces of the nanosheets 21b, 21c, 21d, and 21e on the nanosheets 26b, 26c, 26d, and 26e in the Y direction are not covered by the gate wirings 131b, 131c, 131d, and 131e, respectively, and the gate wirings 131b, It is exposed from 131c, 131d, 131e.
- the surfaces on the nanosheets 21b, 21c, 21d, 21e side in the Y direction are not covered by the gate wirings 136b, 136c, 136d, 136e, and the gate wirings 136b, 136c, 136d, It is exposed from 136e.
- a gate wiring to which VDD is given and a local wiring to which VSS is given are formed, and a capacitance is formed between the gate wiring and the local wiring.
- NS For example, focusing on the transistors P3 and N3, the gate wirings 131c and 136c are connected by the bridge portion 133c, and VDD is given via the metal wiring 152. Further, the local wirings 143 and 144 are given VSS from the power supply wiring 12. Therefore, a capacitance is formed between the gate wirings 131c and 136c and the bridge portion 133c and the local wirings 143 and 144.
- a capacitance is generated between the nanosheets 26b, 26c, 26d and the gate wirings 136b, 136c, 136d for the transistors N2, N3, and N4.
- the surfaces of the nanosheets 21b, 21c, 21d on the nanosheets 26b, 26c, 26d side are exposed from the gate wiring 131b, 131c, 131d, and the nanosheets 26b, 26c, 26d are the surfaces on the nanosheets 21b, 21c, 21d side. Is exposed from the gate wiring 136b, 136c, 136d.
- the distance between the nanosheets 21b, 21c, 21d and the nanosheets 26b, 26c, 26d can be narrowed, so that the area of the capacity cell can be further reduced.
- a large capacitance can be realized between the gate wirings 131c and 136c and the bridge portion 133c and the local wirings 143 and 144.
- the fixed value output unit may be omitted in the above-described embodiment.
- the capacitance cell may be configured so as to directly supply VDD to the gates of the transistors N2, N3, and N4.
- the number of transistors constituting the capacitance is three N-type, but the number of transistors constituting the capacitance is not limited to this.
- two or more nanosheets may be arranged in the Y direction in each transistor.
- the capacitance cell according to the above-described embodiment can be configured by exchanging the conductive type of the transistor.
- FIG. 9 is a plan view showing the layout structure of the capacity cell according to the first modification of the second embodiment.
- the layout structure shown in FIG. 9 corresponds to a layout structure in which the layout structure of FIG. 6 is inverted upside down in the drawing, P-type and N-type are exchanged, and VDD and VSS are exchanged.
- the layout structure of FIG. 9 is the same as the layout structure of FIG. 6 in the arrangement of the power supply wiring, the transistor, the gate wiring, the local wiring, and the M1 wiring. However, the layout structure of FIG. 6 is different from the connection relationship between the M1 wiring and the local wiring and the gate wiring, and the connection relationship between the local wiring and the power supply wiring.
- FIG. 10 is a circuit diagram of the capacitance cell shown in FIG.
- the circuit of FIG. 10 corresponds to a circuit in which the circuit of FIG. 8 is inverted upside down in the drawing, P-type and N-type are exchanged, and VDD and VSS are exchanged.
- the cell shown in FIG. 9 has P-type transistors P1, P2, P3, P4, P5 and N-type transistors N1, N2, N3, N4, N5.
- Transistors P2 to P4 function as capacitances.
- the transistor P1 and the transistor N5 form a fixed value output unit 5.
- the fixed value output unit 5 outputs a low fixed value (VSS) to the node X1 and outputs a high fixed value (VDD) to the node X2.
- the source is connected to VDD
- the drain is connected to the gate of transistor N5, and the gate is connected to the drain of transistor N5.
- the source of transistor N5 is connected to VSS, and the drain of transistor N5 is connected to the gate of transistor P1.
- the gate of the transistor P1 corresponds to the node X1, and the gate of the transistor N5 corresponds to the node X2.
- transistors P2 to P4 the source and drain are connected to VDD, and the gate is connected to node X1. Since the VSS is output from the fixed value output unit 5 to the node X1, the transistors P2 to P4 function as capacitances. Transistors N1 to N4 and transistors P5 are transistors in the off state.
- the local wirings 142, 143, 144, and 145 are connected to the power supply wiring 11 via vias.
- the local wiring 148 is connected to the power supply wiring 12 via vias.
- the metal wiring 151 is connected to the gate wirings 131a, 131b, 131c, 131d via vias, and is connected to the local wirings 146 via vias.
- the metal wiring 152 is connected to the gate wiring 131e via vias, and is connected to the local wiring 141 via vias.
- the metal wiring 153 is connected to the gate wirings 136a, 136b, 136c, 136d via vias, and is connected to the local wirings 147 via vias.
- the metal wiring 154 is connected to the gate wiring 136e via vias, and is connected to the local wiring 141 via vias.
- FIG. 11 is a plan view showing the layout structure of the capacity cell according to the second embodiment.
- the arrangement of the power supply wiring, the transistor, and the gate wiring is the same as the layout structure of FIG.
- the arrangement of the local wiring is partially different, and the connection relationship between the M1 wiring and the local wiring and the gate wiring, and the connection relationship between the local wiring and the power supply wiring are also different.
- FIG. 12 is a circuit diagram of the capacitance cell shown in FIG. In the circuit of FIG. 12, the source and drain of the transistors P1 to P4 and N2 to N4, which were directly connected to VSS in the circuit of FIG. 8, were connected to the node X2 whose fixed value output outputs low fixed value (VSS). Corresponds to the thing.
- the cell shown in FIG. 11 has P-type transistors P1, P2, P3, P4, P5 and N-type transistors N1, N2, N3, N4, N5.
- Transistors N2 to N4 function as capacitances.
- the transistor P5 and the transistor N1 form a fixed value output unit 5.
- the fixed value output unit 5 outputs a high fixed value (VDD) to the node X1 and outputs a low fixed value (VSS) to the node X2.
- VDD fixed value
- VSS low fixed value
- the source is connected to VDD
- the drain is connected to the gate of transistor N1
- the source of transistor N1 is connected to VSS
- the drain of transistor N1 is connected to the gate of transistor P5.
- the gate of the transistor N1 corresponds to the node X1, and the gate of the transistor P5 corresponds to the node X2.
- the source and drain are connected to the node X2, and the gate is connected to the node X1. Since VDD is output from the fixed value output unit 5 to the node X1 and VSS is output from the fixed value output unit 5 to the node X2, the transistors N2 to N4 function as capacitances.
- the transistors P1 to P4 and the transistor N5 are transistors in the off state.
- Transistors P1 to P4 and transistors N5 may not be included in the circuit configuration of the capacitive cell, but if they are present, the regularity of the layout of the capacitive cell is improved, so that the ease of manufacturing the device is improved and the yield is improved. However, manufacturing variations are suppressed.
- Local wirings 241,242, 243, 244, 245, 246, 247, 248 extending in the Y direction are formed in the local wiring layer.
- the local wiring 241 is connected to the pad 22a.
- the local wiring 242 is connected to the pad 27a and is connected to the power supply wiring 12 via vias.
- the local wiring 243 is connected to the pads 22b and 27b.
- the local wiring 244 is connected to the pads 22c and 27c.
- the local wiring 245 is connected to the pads 22d and 27d.
- the local wiring 246 is connected to the pad 22e and is connected to the power supply wiring 11 via via vias.
- the local wiring 247 is connected to the pad 27e.
- the local wiring 248 is connected to the pads 22f and 27f.
- metal wirings 251,252, 253, 254 extending in the X direction are formed.
- the metal wires 252 and 254 correspond to the nodes X1 of the circuit, and the metal wires 251,253 correspond to the nodes X2 of the circuit.
- the metal wiring 251 is connected to the local wirings 241,243,244,245 via vias, and is connected to the gate wiring 131e via vias.
- the metal wiring 252 is connected to the gate wirings 131a, 131b, 131c, 131d via vias, and is connected to the local wirings 248 via vias.
- the metal wiring 253 is connected to the local wirings 243, 244, 245, 247 via vias.
- the metal wiring 254 is connected to the gate wiring 136a, 136b, 136c, 136d via vias, and is connected to the local wiring 248 via vias.
- this modification can also be configured by exchanging the conductive type of the transistor as in the modification 1 with respect to the second embodiment.
- the power supply wiring for supplying VDD and VSS is assumed to be BPR, but the present invention is not limited to this, and for example, M1 wiring or the like may be used.
- a layout structure of a large-capacity capacity cell using a fork sheet FET can be realized, which is useful for, for example, miniaturization of a semiconductor chip and improvement of the degree of integration.
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Abstract
Description
Weff=2×W+H
となる。トランジスタTR1,TR2のチャネル部521,526は3枚のナノシートによって構成されているので、トランジスタTR1,TR2のゲート実効幅は、
3×(2×W+H)
となる。
図1~図3は第1実施形態に係る容量セルのレイアウト構造の例を示す図であり、図1は平面図、図2(a),(b)は平面視横方向における断面図、図3(a)~(c)は平面視縦方向における断面図である。図2(a)は線X1-X1’の断面、図2(b)は線X2-X2’の断面である。図3(a)は線Y1-Y1’の断面、図3(b)は線Y2-Y2’の断面、図3(c)は線Y3-Y3’の断面である。
1)パッド22c,22dとゲート配線31cとの間(図2(a)参照)
2)ローカル配線43b,43cとゲート配線31cとの間(図2(a)参照)
3)ゲート配線31cと、トランジスタN3のゲート配線36cとの間(図3(a)参照)。ゲート配線36cはノードX2からVDDが与えられている。
4)パッド22c,22dと、トランジスタN3のパッド27c,27dとの間(図3(b)参照)。パッド27c,27dはローカル配線44b,44cを介してVSSが与えられている。
5)ローカル配線43b,43cと、ローカル配線44b,44cとの間(図3(b)参照)
上述の実施形態では、各トランジスタにおいて、ナノシートはY方向に1つずつ配置されているものとしたが、ナノシートがY方向に2つ以上、配置されていてもかまわない。この場合は、P型領域とN型領域の境界部分において、対向するナノシートがゲート配線から露出していればよい。すなわち、P型トランジスタが有するナノシートを第1ナノシート部とし、N型トランジスタが有するナノシートを第2ナノシート部としたとき、第1ナノシート部が有するナノシートのうち第2ナノシート部に最も近いナノシートは、Y方向における第2ナノシート部側の面がゲート配線から露出しており、第2ナノシート部が有するナノシートのうち第1ナノシート部に最も近いナノシートは、Y方向における第1ナノシート側の面がゲート配線から露出していればよい。これにより、上述の実施形態と同様の作用効果が得られる。
図6および図7は第2実施形態に係る容量セルのレイアウト構造の例を示す図であり、図6は平面図、図7は平面視縦方向における断面図である。図7(a)は線Y4-Y4‘の断面、図7(b)は線Y5-Y5’の断面である。なお、図6および図7に示すレイアウト構造は、図1~図3に示すレイアウト構造と似通っており、例えば、電源配線、並びに、トランジスタのナノシートおよびパッドの配置については同様である。以下の説明では、第1実施形態と同様の構成については、説明を省略する場合がある。
上述の実施形態に係る容量セルは、トランジスタの導電型を入れ替えて構成することも可能である。
図11は第2実施形態の変形例2に係る容量セルのレイアウト構造を示す平面図である。図11のレイアウト構造は、電源配線、トランジスタ、ゲート配線の配置は図6のレイアウト構造と同様である。ただし、ローカル配線の配置が一部異なっており、また、M1配線とローカル配線およびゲート配線との接続関係、並びに、ローカル配線と電源配線との接続関係が異なっている。
11,12 電源配線
21b,21c,21d,23c,26b,26c,26d,28c ナノシート
22b,22c,22d,22e,27b,27c,27d,27e パッド
24,25 ナノシート部
31b,31c,31d,36b,36c,36d ゲート配線
131b,131c,131d,136b,136c,136d ゲート配線
133b,133c,133d ブリッジ部
142,143,144,145 ローカル配線
P1,P2,P3,P4,P5 P型トランジスタ
N1,N2,N3,N4,N5 N型トランジスタ
Claims (12)
- 容量セルであるスタンダードセルを含む半導体集積回路装置であって、
前記スタンダードセルは、
P型トランジスタが形成されるP型領域とN型トランジスタが形成されるN型領域とが、第1方向において隣接して形成されており、
前記P型領域において、前記第1方向と垂直をなす第2方向に延びている、1つまたは、前記第1方向に並ぶ2つ以上のナノシートからなる、第1ナノシート部と、
前記N型領域において、前記第2方向に延びている、1つまたは、前記第1方向に並ぶ2つ以上のナノシートからなる、第2ナノシート部と、
前記第1方向に延びており、前記第1ナノシート部が有するナノシートの前記第1方向、および、前記第1および第2方向と垂直をなす第3方向における外周を囲うように形成された第1ゲート配線と、
前記第1ナノシート部が有するナノシートの前記第2方向における両端とそれぞれ接続された、第1パッド対と、
前記第1方向に延びており、前記第2ナノシート部が有するナノシートの前記第1方向および前記第3方向における外周を囲うように形成された第2ゲート配線と、
前記第2ナノシート部が有するナノシートの前記第2方向における両端とそれぞれ接続された、第2パッド対とを備え、
前記第1パッド対および前記第2ゲート配線は、第1電源電圧が与えられており、前記第2パッド対および前記第1ゲート配線は、前記第1電源電圧よりも低い第2電源電圧が与えられており、
前記第1ナノシート部と前記第2ナノシート部とは前記第1方向において対向しており、かつ、前記第1ナノシート部が有するナノシートのうち前記第2ナノシート部に最も近いナノシートは、前記第1方向における前記第2ナノシート部側の面が前記第1ゲート配線から露出しており、前記第2ナノシート部が有するナノシートのうち前記第1ナノシート部に最も近いナノシートは、前記第1方向における前記第1ナノシート部側の面が前記第2ゲート配線から露出している
ことを特徴とする半導体集積回路装置。 - 請求項1記載の半導体集積回路装置において、
前記第1および第2ナノシート部が有する各ナノシートは、それぞれ、1枚のシート構造、または、平面視で重なる複数枚のシート構造からなる
ことを特徴とする半導体集積回路装置。 - 請求項1記載の半導体集積回路装置において、
前記第1および第2ゲート配線は、前記第2方向において同一位置に配置されている
ことを特徴とする半導体集積回路装置。 - 請求項1記載の半導体集積回路装置において、
前記第2方向に延び、前記第1電源電圧を供給する第1電源配線と、
前記第2方向に延び、前記第2電源電圧を供給する第2電源配線と、
前記第1および第2電源配線と接続されており、前記第1ゲート配線に前記第2電源電圧を供給するとともに、前記第2ゲート配線に前記第1電源電圧を供給する固定値出力部とを備え、
前記固定値出力部は、
前記P型領域に形成され、ソースが前記第1電源配線と接続された第1P型トランジスタと、
前記N型領域に形成され、ソースが前記第2電源配線と接続された第1N型トランジスタとを有し、
前記第1ゲート配線は、前記第1P型トランジスタのゲートおよび前記第1N型トランジスタのソースと電気的に接続されており、
前記第2ゲート配線は、前記第1P型トランジスタのドレインおよび前記第1N型トランジスタのゲートと電気的に接続されている
ことを特徴とする半導体集積回路装置。 - 容量セルであるスタンダードセルを含む半導体集積回路装置であって、
前記スタンダードセルは、
第1導電型トランジスタが形成される第1領域と第2導電型トランジスタが形成される第2領域とが、第1方向において隣接して形成されており、
前記第1領域において、前記第1方向と垂直をなす第2方向に延びている、1つまたは、前記第1方向に並ぶ2つ以上のナノシートからなる、第1ナノシート部と、
前記第2領域において、前記第2方向に延びている、1つまたは、前記第1方向に並ぶ2つ以上のナノシートからなる、第2ナノシート部と、
前記第1方向に延びており、前記第1ナノシート部が有するナノシートの前記第1方向、および、前記第1および第2方向と垂直をなす第3方向における外周を囲うように形成された第1ゲート配線と、
前記第1ナノシート部が有するナノシートの前記第2方向における両端とそれぞれ接続された、第1パッド対と、
前記第1方向に延びており、前記第2ナノシート部が有するナノシートの前記第1方向および前記第3方向における外周を囲うように形成された第2ゲート配線と、
前記第2ナノシート部が有するナノシートの前記第2方向における両端とそれぞれ接続された、第2パッド対とを備え、
前記第1および第2ゲート配線は、第1電源電圧が与えられており、前記第1および第2パッド対は、前記第1電源電圧と異なる第2電源電圧が与えられており、
前記第1ナノシート部と前記第2ナノシート部とは前記第1方向において対向しており、かつ、前記第1ナノシート部が有するナノシートのうち前記第2ナノシート部に最も近いナノシートは、前記第1方向における前記第2ナノシート部側の面が前記第1ゲート配線から露出しており、前記第2ナノシート部が有するナノシートのうち前記第1ナノシート部に最も近いナノシートは、前記第1方向における前記第1ナノシート部側の面が前記第2ゲート配線から露出している
ことを特徴とする半導体集積回路装置。 - 請求項5記載の半導体集積回路装置において、
前記第1および第2ナノシート部が有する各ナノシートは、それぞれ、1枚のシート構造、または、平面視で重なる複数枚のシート構造からなる
ことを特徴とする半導体集積回路装置。 - 請求項5記載の半導体集積回路装置において、
前記第1および第2ゲート配線は、前記第2方向において同一位置に配置されており、
前記第1ゲート配線と前記第2ゲート配線との間に形成され、前記第1ゲート配線と前記第2ゲート配線とを接続するゲート接続部を備える
ことを特徴とする半導体集積回路装置。 - 請求項5記載の半導体集積回路装置において、
前記第1方向に延びており、前記第1パッド対の一方のパッドと前記第2パッド対の一方のパッドとを接続する第1ローカル配線と、
前記第1方向に延びており、前記第1パッド対の他方のパッドと前記第2パッド対の他方のパッドとを接続する第2ローカル配線とを備える
ことを特徴とする半導体集積回路装置。 - 請求項5記載の半導体集積回路装置において、
前記第1導電型はP型であり、前記第2導電型はN型であり、
前記第1電源電圧は、前記第2電源電圧よりも高い
ことを特徴とする半導体集積回路装置。 - 請求項5記載の半導体集積回路装置において、
前記第1導電型はN型であり、前記第2導電型はP型であり、
前記第1電源電圧は、前記第2電源電圧よりも低い
ことを特徴とする半導体集積回路装置。 - 請求項5記載の半導体集積回路装置において、
前記第2方向に延び、前記第1電源電圧を供給する第1電源配線と、
前記第2方向に延び、前記第2電源電圧を供給する第2電源配線と、
前記第1および第2電源配線と接続されており、前記第1および第2ゲート配線に前記第1電源電圧を供給する固定値出力部とを備え、
前記固定値出力部は、
前記第1領域に形成され、ソースが前記第1電源配線と接続された第1トランジスタと、
前記第2領域に形成され、ソースが前記第2電源配線と接続された第2トランジスタとを有し、
前記第1および第2ゲート配線は、前記第1トランジスタのドレインおよび前記第2トランジスタのゲートと電気的に接続されている
ことを特徴とする半導体集積回路装置。 - 請求項11記載の半導体集積回路装置において、
前記固定値出力部は、前記第1および第2パッド対に前記第2電源電圧を供給するものであり、
前記第1および第2パッド対は、前記第1トランジスタのゲートおよび前記第2トランジスタのドレインと電気的に接続されている
ことを特徴とする半導体集積回路装置。
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| US17/889,106 US12062694B2 (en) | 2020-02-25 | 2022-08-16 | Semiconductor integrated circuit device |
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| US20220216319A1 (en) * | 2019-10-18 | 2022-07-07 | Socionext Inc. | Semiconductor integrated circuit device |
| WO2023099115A1 (en) * | 2021-12-03 | 2023-06-08 | International Business Machines Corporation | Fork sheet with reduced coupling effect |
| WO2024101226A1 (ja) * | 2022-11-09 | 2024-05-16 | 株式会社ソシオネクスト | 半導体集積回路装置 |
| WO2025126581A1 (ja) * | 2023-12-14 | 2025-06-19 | 株式会社ソシオネクスト | 半導体集積回路装置 |
| WO2025141944A1 (ja) * | 2023-12-27 | 2025-07-03 | 株式会社ソシオネクスト | 半導体集積回路装置 |
| WO2025169526A1 (ja) * | 2024-02-06 | 2025-08-14 | 株式会社ソシオネクスト | 半導体集積回路装置 |
| WO2025211237A1 (ja) * | 2024-04-03 | 2025-10-09 | 株式会社ソシオネクスト | 半導体集積回路装置 |
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| US11114153B2 (en) * | 2019-12-30 | 2021-09-07 | Taiwan Semiconductor Manufacturing Co., Ltd. | SRAM devices with reduced coupling capacitance |
| US12336264B2 (en) * | 2022-06-21 | 2025-06-17 | Nanya Technology Corporation | Semiconductor device having gate electrodes with dopant of different conductive types |
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| US20220392999A1 (en) | 2022-12-08 |
| US20240363686A1 (en) | 2024-10-31 |
| CN115136296A (zh) | 2022-09-30 |
| JP7633537B2 (ja) | 2025-02-20 |
| JPWO2021171969A1 (ja) | 2021-09-02 |
| CN115136296B (zh) | 2025-07-08 |
| US12062694B2 (en) | 2024-08-13 |
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