Patent ID: 8361850
Filing Date: 2013-01-29
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, the method comprising: a first step of forming a dummy gate insulating film on a silicon substrate; a second step of forming a dummy gate electrode on the dummy gate insulating film; a third step of forming sidewalls that flank the dummy gate electrode; a fourth step of forming a recess region by partially removing the silicon substrate through recess etching in which the dummy gate electrode is used as a mask; a fifth step of epitaxially growing on a surface of the recess region a mixed crystal layer that is composed of silicon and an atom having a lattice constant different from a lattice constant of silicon; a sixth step of removing the dummy gate electrode sidewalls; a seventh step of forming a diffusion extension region in the silicon substrate such that it extends between the mixed crystal layer and a region under the dummy gate electrode; an eighth step of forming an insulating film on the mixed crystal layer in such a way that the dummy gate electrode is covered by the insulating film, and removing the insulating film until a surface of the dummy gate electrode is exposed; a ninth step of forming a recess in the insulating film by removing the exposed dummy gate electrode; and a tenth step of forming a gate electrode in the recess with intermediary of a gate insulating film.