Patent ID: 7135724
Filing Date: 2006-11-14
Classification: H01L

Abstract:
1. A field effect transistor (“FET”), comprising: a single-crystal semiconductor region of a substrate, said single-crystal semiconductor region having a first composition; a gate overlying said single-crystal semiconductor region; a pair of first spacers overlying respective opposite sidewalls of said gate; a pair of regions consisting essentially of a single-crystal semiconductor alloy having a second composition different from said first composition, said semiconductor alloy regions disposed on opposite sides of said gate, each said semiconductor alloy region spaced a first distance from said gate; and a source region and a drain region at least partly disposed in respective ones of said semiconductor alloy regions, each of said source region and said drain region being spaced a second distance from said gate of, said second distance being different from and independent from said first distance, said second distance being at least partly determined by spacings of said first spacers from said sidewalls of said gate.