Patent ID: 8349680
Filing Date: 2013-01-08
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device comprising: providing a semiconductor substrate having a first active region and a second active region; forming a high-k dielectric layer over the first active region and the second active region of the semiconductor substrate, the high-k dielectric layer having a lower surface facing the semiconductor substrate and an upper surface facing in a an opposite direction from the lower surface; depositing a capping layer on the upper surface of the high-k dielectric layer over the first active region and the second active region of the semiconductor substrate; forming a first metal layer over the capping layer, the first metal layer having a first work function; forming a mask layer over the first metal layer in the first active region; removing the first metal layer and the capping layer in the second active region using the mask layer; and forming a second metal layer over the high-k dielectric layer in the second active region, the second metal layer having a second work function.