Patent ID: 7825493

Claim:
Complementary field-effect transistors comprising: an n-channel field-effect transistor and a p-channel field-effect transistor each having a source region and a drain region, an Si x Ge 1−x (0≦x<1) channel region between the source region and the drain region, a gate insulating film formed over the Si x Ge 1−x (0≦x<1) channel region, and a gate electrode formed over the gate insulating film; wherein the source and drain regions are formed of a compound which includes at least one of silicon and germanium and includes at least a metal; at least a part of the compound is formed in a portion lower than a height of an interface between the gate insulating film and the channel region, and comes in contact with the channel region; and junctions between the channel region and the source region and between the channel region and the drain region are Schottky junctions.