Patent ID: 11961884
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A semiconductor device, comprising:
first and second transistors on a substrate, wherein the first transistor comprises a first fin structure and a first gate structure and the second transistor comprises a second fin structure and a second gate structure;
an isolation region on the substrate and separating the first and second fin structures;
a gate spacer on sidewalls of the first and second gate structures;
a dielectric layer on the isolation region and surrounding the first and second gate structures, wherein the dielectric layer comprises a first dielectric material; and
a fill structure on the isolation region and separating the first and second gate structures, wherein the fill structure comprises:
a dielectric structure in contact with the isolation region and the first and second gate structures and in contact with the gate spacer, the dielectric layer, and the first and second gate structures, wherein the dielectric structure comprises a second dielectric material different from the first dielectric material; and
an air gap enclosed by the dielectric structure and below top surfaces of the first and second fin structures.