Patent ID: 7892911
Filing Date: 2011-02-22
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device, comprising: providing a substrate having a dielectric layer disposed thereon; forming a trench in said dielectric layer; providing a gate dielectric layer at the bottom of said trench and above said substrate; forming a first work-function-setting film of a gate electrode above said gate dielectric layer at the bottom of said trench, wherein said first work-function-setting film is further formed along the sidewalls of said trench, and wherein said first work-function-setting film has a thickness at the bottom of said trench approximately equal to its thickness along the sidewalls of said trench; and forming a second work-function-setting film of said gate electrode above said first work-function-setting film at the bottom of said trench, wherein said second work-function-setting film is further formed adjacent to said first work-function-setting film along the sidewalls of said trench, and wherein said second work-function-setting film has a thickness at the bottom of said trench greater than its thickness adjacent to said first work-function-setting film along the sidewalls of said trench.