Patent ID: 6977400

Claim:
A semiconductor device formed according to a method for fabricating a semiconducting device on a substrate, the improvement comprising the sequential steps of: forming a strained silicon germanium channel layer on the substrate, forming a gate insulation layer on top of the strained silicon germanium channel layer at a temperature that does not exceed about eight hundred centigrade, forming a gate electrode on top of the gate insulation layer, patterning the gate electrode, impregnating a low dose drain dopant into the substrate, activating the low dose drain dopant with a first laser anneal that activates desired portions of the low dose drain dopant without relaxing and heating the strained silicon germanium channel layer disposed beneath the gate electrode, thereby limiting diffusion of the low dose drain dopant underneath the gate electrode, impregnating a source-drain dopant into the substrate, and activating the source-drain dopant with a second laser anneal that activates desired portions of the source-drain drain dopant without relaxing and heating the strained silicon germanium channel layer disposed beneath the gate electrode, thereby limiting diffusion of the source-drain drain dopant underneath the gate electrode.