Patent ID: 7244958

Claim:
A PMOS device, comprising: a SiGe seed layer, wherein said SiGe seed layer is monocrystalline and has about between 50% and 90% of Ge concentration, and a thickness of about between 0.3 nm and 3 nm; a compressively strained Ge layer covering said SiGe seed layer and in direct contact with said SiGe seed layer, wherein said compressively strained Ge layer is monocrystalline and epitaxial with said SiGe seed layer; a Si top layer covering said compressively strained Ge layer and in direct contact with said compressively strained Ge layer, wherein said Si top layer is monocrystalline and epitaxial with said compressively strained Ge layer, and wherein said Si top layer has a thickness of about between 0.3 nm and 4 nm; and wherein said compressively strained Ge layer hosts a channel of said PMOS device, wherein said PMOS device comprises said channel.