Patent ID: 7157355

Claim:
A method for forming a semiconductor device, comprising: providing a silicon substrate having a surface; forming a sacrificial layer over the surface; performing a first implant through the sacrificial layer to form a first implant region extending a first depth from the surface into the silicon substrate, wherein at least a portion of the silicon substrate underlies the first implant region; performing a germanium implant through the sacrificial layer to form a germanium implant region extending a second depth from the surface into the silicon substrate, wherein the first depth extends deeper into the silicon substrate than the second depth; recrystallizing the first implant region and the germanium implant region to form a compressive silicon germanium region at the surface of the silicon substrate; removing the sacrificial layer after the step of recrystallizing; and forming a p-channel semiconductor device using the compressive semiconductor region, wherein the p-channel semiconductor device comprises at least a portion of the compressive silicon germanium region.