Patent ID: 7800182

Claim:
A semiconductor device comprising a p-type field effect transistor (pFET) and an n-type field effect transistor (nFET), wherein the pFET comprises: an embedded SiGe source/drain material formed in source/drain recesses at source/drain regions of a substrate for the pFET; a first gate stack comprising an embedded SiGe gate electrode material, the embedded SiGe gate electrode material being a same material as the embedded SiGe source/drain material; a poly-SiGe layer disposed under the embedded SiGe electrode material of the first gate stack; and a first spacer structure extending along sidewalls of the first gate stack, and wherein the nFET comprises: a second gate stack comprising the poly-SiGe layer disposed over the substrate, and a second spacer structure extending along sidewalls of the second gate stack.