Middle of line structures
The present disclosure relates to semiconductor structures and, more particularly, to middle of line structures and methods of manufacture. The structure includes: a plurality of gate structures; source and drain regions adjacent to respective gate structures of the plurality of gate structures; metallization features contacting selected source and drain regions; and recessed metallization features contacting other selected source and drain regions.
1. A structure comprising:
a plurality of gate structures;
source and drain regions adjacent to respective gate structures of the plurality of gate structures;
metallization features contacting selected source and drain regions;
recessed metallization features contacting other selected source and drain regions; and
a gate contact contacting a gate structure between the recessed metallization features.
2. The structure of claim 1 , further comprising an active region, wherein the gate contact is over the active region.
3. The structure of claim 2 , further comprising a dielectric cap over the recessed metallization features, the dielectric cap isolating the gate contact from the recessed metallization features.
4. The structure of claim 3 , wherein the dielectric cap is pinched-off over the recessed metallization features.
5. The structure of claim 4 , further comprising dielectric spacers surrounding the gate contact and which isolate the gate contact from the metallization features and the recessed metallization features.
6. The structure of claim 5 , wherein the recessed metallization features are below the gate contact.
7. The structure of claim 1 , further comprising source and drain contacts which are electrically contacting the metallization features contacting the selected source and drain regions.
8. The structure of claim 7 , wherein the source and drain metallization features and the source and drain contacts are of a same material.
9. The structure of claim 1 , wherein the gate structure between the recessed metallization features comprises tapered spacers.
10. The structure of claim 9 , wherein the tapered spacers are comprised of SiOCN.
11. A structure comprising:
a plurality of gate structures;
source and drain regions adjacent to respective gate structures of the plurality of gate structures;
metallization features contacting selected source and drain regions; and
recessed metallization features contacting other selected source and drain regions,
wherein a gate structure between the recessed metallization features comprises tapered spacers.
12. The structure of claim 11 , wherein the tapered spacers are comprised of SiOCN.
13. The structure of claim 11 , further comprising source and drain contacts which are electrically contacting the metallization features contacting the selected source and drain regions.
14. The structure of claim 13 , wherein the source and drain metallization features and the source and drain contacts are of a same material.
15. A structure comprising:
a plurality of gate structures;
source and drain regions adjacent to respective gate structures of the plurality of gate structures;
metallization features contacting selected source and drain regions; and
recessed metallization features contacting other selected source and drain regions,
further comprising a gate contact which contacts a gate structure between the recessed metallization features and partially extends over the recessed metallization features.
16. The structure of claim 15 , further comprising an active region, wherein the gate contact is over the active region.
17. The structure of claim 16 , further comprising a dielectric cap over the recessed metallization features, the dielectric cap isolating the gate contact from the recessed metallization features.
18. The structure of claim 17 , wherein the dielectric cap is pinched-off over the recessed metallization features.
19. The structure of claim 18 , further comprising dielectric spacers surrounding the gate contact and which isolate the gate contact from the metallization features and the recessed metallization features.
20. The structure of claim 19 , wherein the recessed metallization features are below the gate contact, and wherein the dielectric cap and the dielectric spacers are composed of SiC, SiCO or SiO 2 .