Patent ID: 7075158

Claim:
A method of manufacturing a semiconductor device comprising: forming gate dielectric films in a region of a semiconductor substrate where a p-channel MOSFET is to be formed, and in a region of the semiconductor substrate where an n-channel MOSFET is to be formed; forming first gate electrode material layers of a partially crystallized nitrided metal silicide for forming a p-channel MOSFET on the gate dielectric films; forming a covering layer for covering only the first gate electrode material layer in the region where a p-channel MOSFET is to be formed; patterning the first gate electrode material layer in the region where an n-channel MOSFET is to be formed using the covering layer as a mask, leaving the first gate electrode material layer only in the region where a p-channel MOSFET is to be formed; forming a second gate electrode material layer of a partially crystallized nitrided metal silicide for forming an n-channel MOSFET on the gate dielectric film in the region where an n-channel MOSFET is to be formed; and removing the covering layer.