Patent ID: 6808964
Filing Date: 2004-10-26
Classification: G02F,H01L

Abstract:
A method of manufacturing a semiconductor device including:forming a semiconductor film on a substrate; forming an insulating film on said semiconductor film; forming a conductive film on said insulating film; forming a first resist film, which has sidewalls, on said conductive film; forming a first gate electrode, which has sidewalls inside of the sidewalls of said first resist film, and a separate portion of said conductive film, by partially removing said conductive film by etching, using said first resist film as a mask; removing said first resist film; forming high impurity concentration source and drain regions of a second conductivity type in regions of said semiconductor film on opposites sides of said first gate electrode by injecting impurities into said semiconductor film, using said first gate electrode and said separate portion of said conductive film as implantation masks, thereby forming a field effect transistor of the second conductivity type; forming a second resist film covering said first gate electrode and said source and drain regions of the second conductivity type and part of said separate portion of said conductive film, said second resist film having sidewalls on said separate portion of said conductive film; forming a second gate electrode, which has sidewalls inside the sidewalls of said second resist film, by partially removing said portion of said conductive film by etching, using said second resist film as a mask; forming a gate insulating film, which includes extended parts having sidewalls positioned beyond the sidewalls of said second gate electrode, by partially removing said insulating film by etching, using said second resist film as a mask; forming high impurity concentration source and drain regions of a first conductivity type in regions of said semiconductor film, spaced apart from the sidewalls of said extended part, by injecting impurities into said semiconductor film, using said second resist film as a mask; removing said second resist film; and forming, after removing said second resist film, low impurity concentration regions of the first conductivity type in said semiconductor film respectively adjacent said source and drain regions of the first conductivity type, the low impurity concentration regions having an impurity concentration relatively lower than that of said high impurity concentration source and drain regions of the first conductivity type, in regions of said semiconductor film positioned beneath said extended parts of said gate insulating film, by injecting impurities into said semiconductor film, using said second gate electrode as a mask, thereby forming a field effect transistor of the first conductivity type.