Patent ID: 6376343
Filing Date: 2002-04-23
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, which method comprises the steps of:(a) providing a silicon (Si)-based semiconductor substrate having a surface; (b) introducing a first dopant of a first conductivity type into at least one selected portion of said substrate, such that the concentration vs. depth profile of said first dopant exhibits a first peak dopant concentration at a first depth below said substrate surface; (c) introducing a second dopant of said first conductivity type into said at least one selected portion of said substrate, such that the concentration vs. depth profile of said second dopant exhibits a second peak dopant concentration at a second depth below said substrate surface, said second depth being greater than said first depth and said second peak dopant concentration being less than said first peak dopant concentration; (d) forming a metal layer on said substrate surface overlying said at least one selected portion of said substrate; (e) reacting said metal layer with said at least one selected portion of said Si-based substrate to form a layer of an electrically conductive metal silicide extending below said substrate surface to a third depth which is greater than said first depth but less than said second depth, thereby eliminating or at least substantially reducing roughness of the interface between said metal silicide layer and said at least one selected portion of said Si-based substrate by minimizing the concentration of said second dopant in said metal silicide layer.