A method of fabricating a transistor comprises the steps of: forming a
gate electrode above a substrate made of a first semiconductor material
having a first lattice spacing, forming recesses in the semiconductor
substrate at respective locations where a source region and a drain
region are to be formed, epitaxially growing a second semiconductor
material having a second lattice spacing different from the first lattice
spacing in the recesses, and implanting a dopant in the second
semiconductor material after the growing step.