Patent ID: 6620718
Filing Date: 2003-09-16
Classification: H01L

Abstract:
A method, comprising:forming a gate stack above a semiconducting substrate, said gate stack comprised of a gate electrode and a protective layer positioned above said gate electrode; forming a plurality of source/drain regions in said substrate; forming a first layer of refractory metal above said source/drain region and said protective layer; performing at least one anneal process to convert a portion of said first layer of refractory metal to a first metal silicide region on each of said source/drain regions; introducing an oxygen containing gas during at least some portion of said at least one anneal process to form a layer of silicon dioxide above each of said first metal silicide regions to thereby free at least some metal atoms in the first metal silicide regions to diffuse through at least a portion of said first metal silicide regions and form a metal silicide at an interface between the substrate and the first metal silicide regions; removing said protective layer from above said gate electrode after forming said first metal silicide regions; forming a second layer of refractory metal above said gate electrode after removing said protective layer; and performing at least one anneal process to convert a portion of said second layer of refractory metal to a second metal silicide region above said gate electrode.