Patent ID: 11961766
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 16:
17. A semiconductor device, comprising:
a substrate;
first and second epitaxial layers disposed on the substrate;
first and second gate oxide structures disposed on the first and second epitaxial layers, respectively, wherein the first and second gate oxide structures comprise:
first and second oxide layers of different thicknesses disposed on the first and second epitaxial layers, respectively,
first and second dielectric layers disposed on the first and second oxide layers, respectively, and
third and fourth oxide layers of different materials with thicknesses that are substantially equal to each other disposed on the first and second dielectric layers, respectively; and

first and second gate metal fill layers disposed on the first and second gate oxide structures, respectively.