SRAM structure with alternate gate pitches
The present disclosure relates to semiconductor structures and, more particularly, to a SRAM structure with alternate gate pitches and methods of manufacture. The structure includes an array of memory cells having a plurality of gate structures with varying gate pitches, the varying gate pitches comprising a first dimension sized for placement of a bitline contact and a second dimension sized for placement of source/drain contacts, the first dimension being larger than the second dimension.
1. A structure comprising an array of memory cells having a plurality of gate structures with varying gate pitches, the varying gate pitches comprising a first dimension sized for placement of a bitline contact and a second dimension sized for placement of source/drain contacts, the first dimension being larger than the second dimension, wherein the first dimension is sized for Vdd and Vcc contacts.
2. The structure of claim 1 , wherein an insulator is provided on sides of the bitline contact between respective gate structures within the first dimension.
3. The structure of claim 2 , wherein the insulator is SiO 2 material.
4. The structure of claim 2 , wherein the insulator is an air gap.
5. The structure of claim 2 , wherein the insulator has a dimension of about 5 nm to about 20 nm.
6. The structure of claim 5 , wherein the insulator has a dimension of about 8 nm.
7. The structure of claim 1 , wherein the first dimension is about 55 nm to about 80 nm.
8. The structure of claim 7 , wherein the source/drain contacts directly abut against sidewall spacers of respective opposing gate structures.
9. The structure of claim 1 , wherein the array of memory cells is a static random access memory (SRAM).
10. The structure of claim 1 , wherein:
the plurality of gate structures includes a pass gate, pull up gates and pull down gates;
a distance “X” between the pass gate, the pull up gates and the pull down gates associated with Vdd, Vcc contacts and the bitline contacts is larger than a distance “Y” between the pass gate, the pull up gates and the pull down gates of non-critical areas, which do not have any of the Vdd or Vcc contacts or the source/drain contacts; and
a space between each of the Vdd, Vcc contacts and the bitline contacts and the respective pass gate, the pull up gates and the pull down gates is filled with an insulator material or air gap.
11. The structure of claim 10 , wherein the source/drain contacts and the bitline contacts are formed on silicide contacts within the spacing “X” and “Y” in active regions of the structure, the source/drain contacts are provided within the spacing “Y”, which is smaller than the spacing “X”, and the bitline contact is within the spacing “X”, with a low-k dielectric material between the bitline contact and respective gate structures.
12. A static random access memory (SRAM), comprising:
a plurality of gate structures;
a first space between opposing gate structures of the plurality of gate structures;
bitline contacts located in the first space between selected ones of the opposing gate structures; and
a second space between other opposing gate structures of the plurality of gate structures, the second space being smaller than the first space,
wherein the first space is sized for Vdd and Vcc contacts.
13. The SRAM of claim 12 , further comprising source/drain contacts in the second space.
14. The SRAM of claim 12 , wherein the Vcc and Vdd contacts are located in the first space between selected ones of the opposing gate structures.
15. The SRAM of claim 14 , wherein the first space and the second space alternate with one another on opposing sides of respective gate structures of the plurality of gate structures.
16. The SRAM of claim 12 , wherein the first space and the second space are provided within a same vertical extent of an array of cells in the SRAM.
17. The SRAM of claim 12 , further comprising low-k dielectric material provided on sides of the bitline contacts located in the first space between selected ones of the opposing gate structures.
18. The SRAM of claim 12 , further comprising air gaps provided on sides of the bitline contacts located in the first space between selected ones of the opposing gate structures.
19. A structure comprising an array of memory cells having a plurality of gate structures with varying gate pitches, the varying gate pitches comprising a first dimension sized for placement of a bitline contact and a second dimension sized for placement of source/drain contacts, the first dimension being larger than the second dimension, wherein the first dimension and the second dimension alternate with one another within gate structures in the array of memory cells.