Patent ID: 7939891

Claim:
A semiconductor device comprising: gate electrodes on a main surface of a semiconductor substrate through gate dielectric films, first silicide layers on upper portions of the gate electrodes, first sidewalls to cover side surfaces of the gate electrodes, the first silicide layers and side surfaces of the gate dielectric films, silicon-germanium films respectively to sandwich the first sidewalls, gate electrodes and gate dielectric films, filled in surface-layer portions of the semiconductor substrate in positions separated from the first sidewalls and having upper portions to reach a position higher than the surface of the semiconductor substrate, second silicide layers on surface-layer portions of regions of the silicon-germanium films that are exposed from the semiconductor substrate, and second sidewalls each to cover a surface extending from an intermediate portion of a side surface of the silicon-germanium film that faces the gate electrode to a portion that contacts with the surface of the semiconductor substrate, a surface of the first sidewall and the surface of the semiconductor substrate exposed from the first sidewall and gate dielectric film, wherein a lower end portion of the side surface of each silicon-germanium film that faces the gate electrode is formed in a planar shape along a direction perpendicular to the surface of the semiconductor substrate, an upper portion lying above the lower end portion is formed in a planar shape that is inclined and set to be separated farther apart from the gate electrode as the upper portion is separated away from the surface of the semiconductor substrate and the surface of the second silicide layer formed at least on the side portion of the silicon-germanium film that faces the gate electrode is set in a position higher than a channel region lying below the gate electrode.