Patent ID: 8466053
Filing Date: 2013-06-18
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a gate insulating film over a substrate; forming a gate electrode film aver said gate insulating film; forming a mask film over a portion of said gate electrode film; selectively removing said gate electrode film by etching using said mask film as a mask; and forming a gate sidewall film so as to be in contact with the lateral surfaces of said mask film and said gate electrode film, wherein said mask film has a laminated film in which at least first, second, and third films are laminated in this order, wherein said third film directly contacts said second film, said second film has a higher etching selectivity ratio than that of said third film with respect to said gate sidewall film, and said third film has a higher etching selectivity ratio than that of said second film with respect to said gate electrode film.