Patent ID: 7285449
Filing Date: 2007-10-23
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising the steps of: (a) forming a gate electrode comprising semiconductor over a partial surface area of a semiconductor substrate; (b1) forming a first film over the semiconductor substrate, the first film covering the gate electrode; (b2) anisotropically etching the first film to leave a mask member consisting of the first film on both sides of the gate electrode and expose a surface underlying the first film adjacent to said mask member; (c) implanting impurities into the gate electrode; (d) removing the mask member; and (e) implanting impurities into a surface layer of the semiconductor substrate on both sides of the gate electrode to form source and drain regions, further comprising between said steps (a) and (b) a step of implanting impurities into the surface layer of the semiconductor substrate by using the gate electrode as a mask, wherein said step (e) includes the steps of: (e1) forming sidewall spacers on sidewalls of the gate electrode after the step (d), the sidewall spacers covering an area narrower than the surface of the semiconductor substrate which had been covered with the mask member; and (e2) implanting impurities into the surface layer of the semiconductor substrate by using the gate electrode and the sidewall spacers as a mask.