Patent ID: 8586448

Claim:
A method of forming a silicon film on a groove which is formed in a surface of an object and has a bottom surface and side surfaces, the method comprising: performing a first film-forming process of forming a non-doped silicon film which is not doped with an impurity on the bottom surface and the side surfaces of the groove such that an opening portion, which is opened upward in the groove, is formed in the groove; performing an etching process of etching the non-doped silicon film formed via the first film-forming process so as to enlarge the opening portion of the non-doped silicon film; performing a doping process of doping the non-doped silicon film etched via the etching process with an impurity; and performing a second film-forming process of forming an impurity-doped silicon film so as to embed the silicon film doped via the doping process.