Patent ID: 8071435

Claim:
A method for manufacturing a semiconductor device comprising: (a) forming a gate electrode on a silicon substrate, through a gate insulating film; (b) forming a lamination of an insulating film and a sacrificial film having different etching characteristics on the silicon substrate, covering said gate electrode, and anisotropically etching the lamination to form side wall spacers on side walls of the gate electrode and the gate insulating film; (c) implanting impurities into the silicon substrate on both sides of the side wall spacers; (d) etching the silicon substrate and a portion of the lamination of the side wall spacers to form recesses in the silicon substrate, and to change a cross sectional shape of each of the side wall spacers to approximately an L-shape; (e) epitaxially growing Siâ€”Ge-containing crystal in the recesses; and (f) depositing an insulating film containing stress, covering the side wall spacers.