Patent ID: 7704840

Claim:
A method for fabricating semiconductor device, the method comprising the steps of: providing a semiconductor-on-insulator structure comprising: a substrate, a semiconductor layer having a first surface and a second surface, and an insulating layer disposed between the substrate and the second surface of the semiconductor layer; blanket growing a strain-inducing epitaxial layer over the first surface; depositing a capping layer over the strain-inducing epitaxial layer; and removing a first portion of the capping layer and a first portion of the strain-inducing epitaxial layer to define sidewalls in the capping layer and the strain-inducing epitaxial layer; depositing a first insulator layer; etching the first insulator layer to form insulating spacers overlying the sidewalls and to define a space between the insulating spacers which comprises an exposed portion of the first surface; and forming source/drain extension regions under the insulating spacers, wherein the source/drain extension regions are in contact with the remaining portions of the strain-inducing epitaxial layer.