Patent ID: 7172934
Filing Date: 2007-02-06
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising: forming a gate dielectric film on a substrate; forming a seed Si film on the gate dielectric film; forming a SiGe film on the seed Si film at a temperature between 450° C. and 494° C., and continuously forming a cap Si film with a thickness of 0.5 nm to 5 nm on the SiGe film at the same temperature at which the SiGe film is formed; forming an upper Si film on the cap Si film at a temperature higher than the temperature of forming the SiGe film; patterning the upper Si film, the cap Si film, the SiGe film, and the seed Si film to form a gate electrode; and forming source-drain regions in the substrate by ion implantation using the gate electrode as a mask.