Patent ID: 11948971
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. An integrated circuit device comprising:
a semiconductor region comprising a first sidewall and a facet over and joined to the first sidewall;
a semiconductor fin connected to the semiconductor region;
a gate stack on the semiconductor fin;
a dielectric layer comprising a second sidewall contacting the first sidewall; and
a dielectric region comprising:
a first portion extending into the dielectric layer, wherein the first portion comprises first sidewalls opposing to each other, and wherein both of the first sidewalls are in contact with second sidewalls of the dielectric layer; and
a second portion protruding higher than the dielectric layer, wherein the facet of the semiconductor region, a top surface of the dielectric layer, and a sidewall of the dielectric region enclose an air gap therein.