Patent ID: 11935954
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 0:
1. A semiconductor device structure, comprising:
a fin structure formed over a substrate;
nanostructures formed over the fin structure;
a gate structure wrapped around the nanostructures;
a first inner spacer formed beside the gate structure;
a second inner spacer formed beside the first inner spacer;
spacer layers formed over opposite sides of the gate structure above the nanostructures; and
source/drain epitaxial structures formed over opposite sides of the fin structure,
wherein the second inner spacer has a first portion embedded in the source/drain epitaxial structures and a second portion embedded in the first inner spacer, and wherein the second portion has a thickness decreasing from a middle portion of the second inner spacer toward the nanostructures.