Patent ID: 6921933

Claim:
A semiconductor device comprising: a gate electrode formed on a semiconductor substrate with a gate insulating film interposed therebetween; a channel region composed of a first-conductivity-type impurity layer formed in a region of a surface portion of the semiconductor substrate located below the gate electrode; source/drain regions composed of second-conductivity-type impurity layers formed in regions of the surface portion of the semiconductor substrate located on both sides of the gate electrode; second-conductivity-type extension regions formed between the channel region and respective upper portions of the source/drain regions in contact relation with the source/drain regions; and first-conductivity-type pocket regions doped with indium ions, and formed between the channel region and respective lower portions of the source/drain regions, such that the first-conductivity-type pocket regions are in contact with the source/drain regions and in no contact with the gate insulating film.