Patent ID: 8501569

Claim:
A method of fabricating a semiconductor device, comprising: forming a gate over a substrate; performing a first implantation process to form a first doped region in the substrate, the first doped region being adjacent to the gate; performing a second implantation process to form a second doped region in the substrate, the second doped region being formed farther away from the gate than the first doped region, the second doped region having a higher doping concentration level than the first doped region; removing portions of the first and second doped regions to form a recess in the substrate, wherein the removing the portions of the first and second doped regions comprises leaving at least a portion of the second doped region within the substrate between the recess and the gate; and epitaxially growing a third doped region in the recess, the third doped region having a higher doping concentration level than the second doped region.