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

Claim 9:
10. A semiconductor structure, comprising:
first and second fin structures on a substrate;
a first gate structure disposed on the first fin structure;
a second gate structure disposed on the second fin structure;
a gate spacer on sidewalls of the first and second gate structures;
an interlayer dielectric structure on the substrate and surrounding the first and second gate structures, wherein the interlayer dielectric structure comprises a first dielectric material; and
a fill structure in the interlayer dielectric structure and separating the first and second gate structures, wherein the fill structure comprises:
a dielectric structure in contact with the gate spacer, the interlayer dielectric structure, 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 below top surfaces of the first and second fin structures.