Patent ID: 9281374
Filing Date: 2016-03-08
CPC Classification: H01L

Claim Text:
1. A first and second metal gate process, comprising: providing a substrate; forming a gate dielectric layer on the substrate; forming a barrier layer on the gate dielectric layer; forming a first work function metal layer on a part of the barrier layer; forming a titanium aluminum metal layer on the barrier layer and the first work function metal layer for serving as a second work function layer; and forming a titanium aluminum nitride metal layer having a U-shaped profile structure in-situ directly on the titanium aluminum metal layer, so that the first metal gate structure comprises the gate dielectric layer, the barrier layer, the first work function metal layer, the second work function metal layer and the titanium aluminum nitride metal layer, and the second metal gate structure comprises the gate dielectric layer, the barrier layer, the second work function metal layer and the titanium aluminum nitride metal layer.