Patent ID: 8004047

Claim:
A semiconductor device, comprising: a workpiece, the workpiece comprising a first region and a second region; a first gate dielectric of a first transistor disposed over the workpiece in the first region of the workpiece; a second gate dielectric of a second transistor disposed over the workpiece in the second region of the workpiece, the second gate dielectric comprising a different material than the first gate dielectric; two recessed regions in the workpiece proximate each of the first gate dielectric and the second gate dielectric; a first dopant-bearing metal disposed in the recessed regions of the workpiece proximate the first gate dielectric, the first dopant-bearing metal comprising a first dopant; a second dopant-bearing metal disposed in the recessed regions of the workpiece proximate the second gate dielectric, the second dopant-bearing metal comprising a second dopant, the second dopant being different than the first dopant; a first doped region disposed in the workpiece adjacent the first dopant-bearing metal, the first doped region comprising the first dopant; and a second doped region disposed in the workpiece adjacent the second dopant-bearing metal, the second doped region comprising the second dopant, wherein the first dopant-bearing metal and the first doped region comprise a source region and a drain region of the first transistor, and wherein the second dopant-bearing metal and the second doped region comprise a source region and a drain region of the second transistor.