Patent ID: 7759206

Claim:
A method of forming a semiconductor device, comprising: depositing a first oxide layer over a gate region and a semiconductor substrate; depositing a nitride layer on said first oxide layer; depositing a second oxide layer on said nitride layer; etching said first oxide layer, said second oxide layer, and said nitride layer to form an L-shaped spacer on each side of said gate region; depositing a third oxide layer on said L-shaped spacers so that said third oxide layer covers a portion of said semiconductor substrate a predetermined distance from a lateral edge of said L-shaped spacer; etching said third oxide layer to reveal a top portion of said gate region and a top portion of said L-shaped spacer; implanting ions in said substrate to define an implant region in said substrate at said predetermined distance from said lateral edge; annealing said implant region to define a source-drain region, said source-drain region having an edge that is co-planar with said lateral edge; removing said second and third oxide layers; and forming a silicide region having an edge substantially co-planar to said lateral edge.