Patent ID: 11901440
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 16:
17. A method of forming a semiconductor device, the method comprising:
forming at least one sacrificial semiconductor fin in a first region of a semiconductor substrate and at least one active semiconductor fin in a second region of the semiconductor substrate, wherein the at least one sacrificial semiconductor fin has a first critical dimension;
forming a source/drain region on the semiconductor substrate in the first region including the at least one sacrificial semiconductor fin and the second region including the at least one active semiconductor fin;
forming a functional gate structure in the second region and laterally adjacent to the at least one active semiconductor fin;
forming a dielectric material stack adjacent to, and above, the at least one sacrificial semiconductor fin and the at least one active semiconductor fin;
forming an opening in the dielectric material stack that physically exposes the at least one sacrificial semiconductor fin, wherein the opening has a second critical dimension that is greater than the first critical dimension of the at least one sacrificial semiconductor fin;
removing the at least one sacrificial semiconductor fin to provide a contact rail opening having a lower portion having the first critical dimension and an upper portion having the second critical dimension, the contact rail opening physically exposes a surface of the source/drain region; and
forming a contact rail in the contact rail opening and on the physically exposed surface of the source/drain region.