Patent ID: 7727829
Filing Date: 2010-06-01
Classification: H01L

Abstract:
1. A method of forming a semiconductor device using a semiconductor substrate, comprising: forming a gate dielectric over the semiconductor substrate; forming a gate electrode layer over the gate dielectric; forming a patterned masking layer over the gate electrode layer, wherein a first region of the gate electrode layer lies within an opening in the patterned masking layer; partially etching the first region of the gate electrode layer to form a polysilicon inverse “T” structure from the gate electrode layer and leave an elevated portion of the gate electrode layer forming a gate structure and a lower portion adjacent to the elevated portion; forming a sidewall spacer adjacent to the elevated portion and over the lower portion; performing an implant into the semiconductor substrate using the elevated portion and the sidewall spacer as a mask to form a first source/drain region; removing the sidewall spacer to expose the polysilicon inverse “T” structure; removing the lower portion; heating the first source/drain region; implanting into the semiconductor substrate, after the step of heating the first source/drain region, using the gate structure as a mask to form a source/drain extension region in the substrate laterally adjacent to the gate structure; and heating the source/drain extension region.