Patent ID: 7670934

Claim:
A method of fabricating a semiconductor device on and in a semiconductor substrate having a first region and a second region, the method comprising the steps of: forming a first gate stack overlying the first region and a second gate stack overlying the second region; etching into the substrate first recesses and second recesses, the first recesses aligned at least to the first gate stack in the first region, and the second recesses aligned at least to the second gate stack in the second region; epitaxially growing a first stress-inducing monocrystalline material in the first and second recesses; removing the first stress-inducing monocrystalline material from the first recesses; and epitaxially growing a second stress-inducing monocrystalline material in the first recesses, wherein the second stress-inducing monocrystalline material has a composition different from the first stress-inducing monocrystalline material.