Patent ID: 7572706

Claim:
A method for forming a semiconductor device, comprising: forming a gate structure overlying a substrate having a first conductivity type; forming a sidewall spacer adjacent to the gate structure; performing an angled implant in a direction of a source side of the semiconductor device to form a region on the source side, in the substrate, and under a portion of the gate structure wherein the angled implant uses dopants that cause a second conductivity type opposite to that of the first conductivity type; annealing the semiconductor device; forming recesses adjacent opposite ends of the sidewall spacer in the substrate to expose a first type of semiconductor material and to leave a portion of the region of the second conductivity type that is under the gate structure; and epitaxially growing a second type of semiconductor material in the recesses, wherein the second type of semiconductor material has a natural lattice constant different from a lattice constant of the first type of semiconductor material to create stress in a channel region of the semiconductor device.