Patent ID: 7807538

Claim:
A method of making a semiconductor device comprising: forming a gate insulating film above a semiconductive substrate; forming a gate electrode on the gate insulating film; forming in or on the substrate at both sides of the gate electrode a pair of spaced-apart heavily-doped impurity layers of p-type conductivity to a concentration ranging from 5×10 19 to 1×10 21 atoms per cubic centimeter (/cm 3 ); forming a silicide layer by causing the impurity layers to react with a metal while simultaneously applying a compressive strain to the impurity layers; and forming a Si x Ge 1-x (where x is greater than or equal to zero and less than one) layer in or on the substrate at the both sides of the gate electrode, wherein the impurity layers are formed at least in a region between the gate electrode and the Si x Ge 1-x layer.