Patent ID: 8299453
Filing Date: 2012-10-30
Classification: H01L

Abstract:
1. A semiconductor structure comprising a field effect transistor located on a semiconductor substrate, wherein said field effect transistor comprises: a body region including a channel-containing body portion having a doping of a first conductivity type and comprising a silicon-germanium alloy having a first atomic concentration of germanium and including a channel; a source region having a doping of a second conductivity type and comprising a silicon-germanium alloy having a second atomic concentration of germanium, wherein said second atomic concentration is greater than said first atomic concentration, and wherein said second conductivity type is the opposite of said first conductivity type; and a drain region having a doping of said second conductivity type and comprising a silicon-germanium alloy having said second atomic concentration of germanium, wherein said body region further includes: a source-side body portion comprising intrinsic epitaxial silicon and being substantially free of germanium; and a drain-side body portion comprising intrinsic epitaxial silicon and being substantially free of germanium.