Patent ID: 7705345

Claim:
A Fin Field Effect Transistor (FinFET), comprising: a relaxed first material disposed on a substrate, having a pair of vertically disposed sidewalls extended from a surface of said substrate and a top surface disposed parallel to said substrate; and a strained second material formed on said pair of sidewalls, wherein said relaxed first material is devoid of said strained second material on said top surface; wherein said relaxed first material and said second strained material form at least a fin of said FinFET, wherein said relaxed first material comprises SiGe, having a composition of Ge within a range of about 20% to about 70% Ge, and wherein said relaxed first material comprises a graded buffer layer such that said relaxed first material is gradually more relaxed at a position distant from the surface of a silicon-on-insulator layer than at a position proximate to the silicon-on-insulator layer.