Patent ID: 8828813

Claim:
A method for fabricating a semiconductor device, comprising: providing a substrate; forming a sacrificial layer over the substrate, wherein the sacrificial layer comprises a different lattice structure than the substrate; forming a gate over the sacrificial layer, wherein a sacrificial channel region is arranged under the gate in the sacrificial layer and wherein sacrificial source/drain regions are arranged on opposite edges of the gate in the sacrificial layer; removing at least a portion of the sacrificial source, sacrificial drain, and sacrificial channel regions concurrently to form a recess within the substrate; and forming a strain inducing or high mobility layer in the recess, wherein the strain inducing or high mobility layer comprises a replacement source region, a replacement drain region, and a replacement channel region formed in place of the sacrificial source region, sacrificial drain region, and sacrificial channel region, respectively, and wherein the strain inducing or high mobility layer is configured to provide increased charge carrier mobility in the replacement channel region relative to the sacrificial channel region.