Patent ID: 6809039
Filing Date: 2004-10-26
Classification: C23F,H01L

Abstract:
A method for forming a metal silicide layer in a self-aligned manner on a source region, a drain region and a gate electrode of a semiconductor device formed on a semiconductor substrate, said method comprising the steps of:(A) depositing a cobalt film over an entire surface of said semiconductor device formed on said semiconductor substrate, (B) forming a silicidized cobalt film layer on said source region, drain region and said gate electrode by performing a heat treating thereof, and (C) etching away an unreacted cobalt film remaining on said semiconductor substrate while leaving the nietal-silieide silicidized cobalt film layer intact, using as an etching solution an admixture solution consisting essentially of hydrochloric acid, hydrogen peroxide, and water, having relative concentration ratio thereof ranging from 1:1:5 to 3:1:5, at a solution temperature of 25 to 45Â° C., with an etching time of 1 to 20 minutes.