Patent ID: 6197648
Filing Date: 2001-03-06
Classification: H01L

Abstract:
A manufacturing method of semiconductor device comprising the steps of:forming a gate electrode on a semiconductor substrate,forming low density doping regions by ion implantation of impurities in said semiconductor substrate by using said gate electrode as a mask,forming a first insulating film covering said gate electrode on said semiconductor substrate,forming a second insulating film on said first insulating film, said second insulating film having an etching selective ratio to said first insulating film;etching said first and second insulating films by anisotropic etching, thereby forming side walls only on sides of said gate electrode, each of said side walls being a laminate film composed by said first and second insulating films;implanting ions of impurities into said semiconductor substrate by using said gate electrode and said side walls as a mask, thereby forming source and drain regions;removing said second insulating film of said side walls whereby portions of said source and drain regions are exposed;etching said first insulating film by anisotropic etching after the removal of said second insulating film of said side walls, thereby narrowing a width of each of the side walls and broadening the exposed portions of said source and drain regions; andforming silicide layers on said source and drain regions after the etching step of said first insulating film.