Patent ID: 11901183
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method of forming a semiconductor device, the method comprising:
forming an opening in a dielectric layer to expose a source/drain region under the dielectric layer, the opening exposing first sidewalls of the dielectric layer;
selectively forming a silicide material at a bottom of the opening on the source/drain region by performing a plasma-enhanced chemical vapor deposition (PECVD) process, wherein an RF source for the PECVD process is turned on and off periodically during the PECVD process, wherein an average energy of plasmas of the PECVD process is adjusted to be above a first activation energy for forming the silicide material on the source/drain region but below a second activation energy for forming the silicide material on the dielectric layer, wherein after the PECVD process, the source/drain region is covered by the silicide material, and the first sidewalls of the dielectric layer are exposed by the silicide material; and
filling the opening with a conductive material.