Patent ID: 7381623

Claim:
A method, comprising: forming a first gate and a second gate on a substrate; forming an oxide layer on said first gate, said second gate, and said substrate; forming a nitride layer on said oxide layer; removing portions of said nitride layer adjacent said first gate, portions of said oxide layer adjacent said first gate, and portions of said substrate adjacent said first gate, so as to form source and drain recesses adjacent said first gate; removing remaining portions of said nitride layer so as to expose remaining portions of said oxide layer; precleaning said remaining portions of said oxide layer and said source and drain recesses; after said precleaning, epitaxially growing a strained material in said source and drain recesses using an epitaxial growth process that is selective to oxide; and prior to said forming of said first gate and said second gate, forming said substrate, comprising forming a buried oxide layer on a first silicon layer, and forming a second silicon layer on said buried oxide layer.