Patent ID: 11961768
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of forming semiconductor device, the method comprising:
forming a first fin extending from a first region of a semiconductor substrate and a second fin extending from a second region of the semiconductor substrate;
forming a first gate dielectric layer on the first fin and a second gate dielectric layer on the second fin;
forming a first capping layer on the first gate dielectric layer and a second capping layer on the second gate dielectric layer;
forming a first work-function layer on the first capping layer; and forming a second work-function layer on the second capping layer, wherein the first work-function layer and the second work-function layer comprise a same material, and wherein the first work-function layer has a first proportion of a first crystalline orientation and the second work-function layer has a second proportion of the first crystalline orientation, the first proportion of the first crystalline orientation being different than the second proportion of the first crystalline orientation; and
forming a bulk metal on the first work-function layer and on the second work-function layer;
wherein forming the first capping layer and the second capping layer comprises:
forming a capping material layer in a trench; and
recessing the capping material layer to below an upper surface of the first gate dielectric layer, or below an upper surface of the second gate dielectric layer.