Patent ID: 11955528
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A method of forming a FinFET device, comprising:
providing a substrate with fins;
forming a dummy gate strip across the fins and forming a dielectric layer aside the dummy gate strip;
removing the dummy gate strip to form a gate trench in the dielectric layer;
forming a high-k material layer on a surface of the gate trench;
forming a P-type work function metal material layer on the high-k material layer; and
forming a barrier material layer over the P-type work function metal material layer, wherein forming the barrier material layer comprises forming multiple first films, wherein the first films comprise TiAlN, TaAlN or AlN and have a gradient aluminum content ranging from 10 at % to 90 at %, wherein the barrier material layer is separated from the P-type work function metal material layer.