Patent ID: 7977179

Claim:
A method comprising: forming a first device feature and a second device feature; forming a first sidewall spacer structure on sidewalls of said first device feature and a second sidewall spacer structure on sidewalls of said second device feature; forming a first implantation mask configured to expose a first device region comprising said first device feature and to cover a second device region comprising said second device feature; implanting a first dopant species into said first device region; modifying a width of said second sidewall spacer structure by etching said second sidewall spacer structure through an opening in a second implantation mask that covers the first device feature; and implanting a second dopant species into said second device region on the basis of the second implantation mask, wherein said second device region comprises a semiconductor alloy region, and wherein a portion of the second dopant species is implanted into the semiconductor alloy region.