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

Claim 10:
11. A method of forming a FinFET device, comprising:
forming a high-k material layer on a substrate;
forming an N-type work function metal material layer on the high-k material layer; and
forming a barrier material layer over the N-type work function metal material layer, wherein forming the barrier material layer comprises:
(a) forming a first film, comprising turning on the nitrogen precursor and turning on an aluminum precursor;
(b) forming a second film, comprising turning on the nitrogen precursor but turning off the aluminum precursor; and
(c) repeating step (a) and step (b) alternately m times, wherein m is an integer between 1 and 5,
wherein the barrier material layer is formed with first films and second films alternately stacked, and the first films have a gradient aluminum content ranging from 10 at % to 90 at %, and the aluminum content is gradually increased from a bottom surface of the barrier material layer towards a top surface of the barrier material layer.