Patent ID: 9166020
Filing Date: 2015-10-20
Classification: H01L

Abstract:
1. A method for manufacturing a metal gate structure comprising: providing a substrate having a high-K gate dielectric layer and a bottom barrier layer sequentially formed thereon; forming a work function metal layer on the substrate, the work function metal layer comprising a titanium aluminide (TiAl) layer or a Ti/Al bi-layered structure; performing an anneal treatment to the work function metal layer in-situ to induce a phase transformation of the work function metal layer to form a titanium tri-aluminide (TiAl forming a top barrier layer on the work function metal layer; forming a low-resistance metal layer on the top barrier layer; and performing a planarization process to form the metal gate structure after forming the low-resistance metal layer, wherein the step of forming the work function metal layer and the step of performing the anneal treatment are in-situ performed in a vacuum environment and the step of forming the top barrier layer is performed after removing the vacuum environment.