Patent ID: 9070704
Filing Date: 2015-06-30
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising: forming a well diffusion layer in a semiconductor substrate by ion implantation; forming a gate electrode on the well diffusion layer of the semiconductor substrate; forming at least one insulating film over the entire well diffusion layer, the at least one insulating film being over the gate electrode; forming a recessed portion extending through the at least one insulating film and within the well diffusion layer of the semiconductor substrate at a side of the gate electrode; forming an epitaxial layer comprising a semiconductor material having a lattice constant different from that of the semiconductor substrate, the epitaxial layer being formed on the recessed portion of the well diffusion layer of the semiconductor substrate while the at least one insulating film remains over the well diffusion layer except at the recessed portion; forming a sidewall for the gate electrode from a portion of the at least insulating film that is between the gate electrode and the recessed portion while selectively removing other portions of the at least one insulating film from the well diffusion layer; and diffusing impurities into the epitaxial layer and a surface portion of the semiconductor substrate, the surface portion with the impurities being a diffusion layer, wherein,