Patent ID: 11923240
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 0:
1. A method of forming a semiconductor device, comprising:
providing a substrate;
forming a first transistor on the substrate, and comprising
forming a first gate structure, wherein the first gate structure comprises a first high-k layer, a first work function layer, an overlying work function layer, and a first capping layer sequentially formed on the substrate; and

forming a second transistor on the substrate, and comprising
forming a second gate structure, the second gate structure comprising a second high-k layer, a second work function layer, and a second capping layer sequentially formed on the substrate,

wherein the first capping layer and the second capping layer comprise materials having higher resistant to oxygen or fluorine than materials of the second work function layer and the overlying work function layer.