Integrated circuit using FinFETs and having a static random access memory (SRAM)
View Patent ↗An integrated circuit includes a logic circuit and a memory cell. The logic circuit includes a P-channel transistor, and the memory cell includes a P-channel transistor. The P-channel transistor of the logic circuit includes a channel region. The channel region has a portion located along a sidewall of a semiconductor structure having a surface orientation of (110). The portion of the channel region located along the sidewall has a first vertical dimension that is greater than a vertical dimension of any portion of the channel region of the P-channel transistor of the memory cell located along a sidewall of a semiconductor structure having a surface orientation of (110).
1. An integrated circuit, comprising:
a memory circuit comprising:
a first P-channel transistor, wherein the first P-channel transistor includes a first channel region; and
a logic circuit comprising:
a second P-channel transistor, the second P-channel transistor includes a second channel region, the second channel region includes a portion located along a first sidewall of a first semiconductor structure, the first sidewall of the first semiconductor structure having a surface orientation of (110), the portion of the second channel region along the first sidewall has a first vertical dimension, wherein the hole transport of the second channel region is in a generally horizontal direction, wherein the first vertical dimension is greater than a vertical dimension of any portion of the first channel region along a sidewall of a semiconductor structure having a surface orientation of (110).
2. The integrated circuit of claim 1 wherein:
the first channel region includes a portion located along a second sidewall of a second semiconductor structure, the second sidewall of the second semiconductor structure has a surface orientation of (110), the portion of the first channel region along the second sidewall has a second vertical dimension, the second vertical dimension is less than the first vertical dimension.
3. The integrated circuit of claim 2 wherein the first semiconductor structure has a vertical dimension that is greater than a vertical dimension of the second semiconductor structure.
4. The integrated circuit of claim 2 further comprising:
a dielectric structure located adjacent the second sidewall of the second semiconductor structure, wherein the second sidewall extends higher than a top of the dielectric structure.
5. The integrated circuit of claim 4 wherein the portion of the first channel region located along the second sidewall extends generally from a location adjacent to the top of the dielectric structure to the top of the second sidewall.
6. The integrated circuit of claim 1 wherein the first P-channel transistor is a planar transistor.
7. The integrated circuit of claim 6 wherein the first channel region includes a portion located along a top surface of a second semiconductor structure, wherein the top surface has a surface orientation of (100).
8. The integrated circuit of claim 1 wherein the first channel region is located in a second semiconductor structure, the integrated circuit further comprising:
a dielectric structure located adjacent a second sidewall of the second semiconductor structure, wherein a top of the dielectric structure is substantially at the same height as a top of the second semiconductor structure.
9. The integrated circuit of claim 1 wherein the first channel region is implemented in a second semiconductor structure and has a portion located along a second sidewall of the second semiconductor structure, wherein the second sidewall has a surface orientation of (100).
10. The integrated circuit of claim 9 wherein the memory circuit includes an N-channel transistor having a third channel region, a portion of the third channel region is located along a third sidewall of a third semiconductor structure, wherein the third sidewall has a surface orientation of (100).
11. The integrated circuit of claim 1 wherein the memory circuit includes an N-channel transistor, wherein the N-channel transistor has a greater transistor strength than a transistor strength of the first P-channel transistor.
12. The integrated circuit of claim 11 wherein:
the memory circuit includes an SRAM cell;
the N-channel transistor is a pass transistor of the SRAM cell; and
the first P-channel transistor is a pull-up transistor of the SRAM cell.
13. The integrated circuit of claim 1 wherein the first channel region does not include any portion located along a sidewall of a semiconductor structure having a surface orientation of (110).
14. A method of forming an integrated circuit, the method comprising:
forming a first P-channel transistor of a memory circuit, the first P-channel transistor has a first channel region;
forming a second P-channel transistor of a logic circuit of an integrated circuit, wherein the second P-channel transistor includes a second channel region, the second channel region includes a portion having first vertical dimension located along a first sidewall of a first semiconductor structure having a surface orientation of (110); and
wherein the first vertical dimension is greater than any portion of the first channel region located along a sidewall of a semiconductor structure having a surface orientation of (110).
15. The method of claim 14 wherein:
the first channel region includes a portion having a second vertical dimension located along a second sidewall of a second semiconductor structure, the second sidewall has a surface orientation of (110), wherein the second dimension is less than the first dimension.
16. The method of claim 15 wherein the first sidewall has a greater vertical dimension than the second sidewall.
17. The method of claim 15 further comprising:
forming a dielectric structure adjacent the second sidewall, wherein the first channel region has a vertical dimension that extends from a location generally adjacent to a top of the dielectric structure to a top of the a second sidewall of a second semiconductor structure.
18. The method of claim 14 wherein the first channel region includes a portion located along a second sidewall of a second semiconductor structure having a surface orientation of (100), the method further comprising:
forming an N-channel transistor of a memory circuit having a third channel region, wherein the third channel region includes a portion located along a third sidewall of a third semiconductor structure having a surface orientation of (100).
19. The method of claim 14 wherein the second P-channel transistor is a planar transistor.
20. An integrated circuit, comprising:
a substrate;
a memory circuit comprising:
a first P-channel transistor, wherein the first P-channel transistor includes a first channel region in a first semiconductor structure above the substrate, wherein the first channel region has sidewalls, a top surface, and a first effective width; and
a logic circuit comprising:
a second P-channel transistor having a second channel region located in a second semiconductor structure above the substrate, wherein:
the second channel region has a top surface and sidewalls;
the sidewalls of the second channel region have a surface orientation of (110);
the second channel region has a width along the sidewalls; and
the width along the sidewalls of the second channel region is greater than a total of the first effective width that has a surface orientation of (110).