Patent ID: 7525171

Claim:
A semiconductor device comprising: a semiconductor; an electrically conductive region which is in contact with the semiconductor to form a Schottky junction; an insulator which is in contact with the semiconductor and the electrically conductive region, and has a fixed-charge containing region which contains a fixed charge and extends across a boundary between the semiconductor and the electrically conductive region; and a gate electrode, and wherein: the electrically conductive region includes a source region and a drain region provided on one principal plane of the semiconductor and spaced form each other; the insulator includes a gate insulating film under the gate electrode and a first insulating layer provided on opposite sides of the gate insulating film in such a manner that the first insulating layer overlaps the source region and the drain region; the fixed-charge containing region is contained in opposite end portions of the gate insulating film and portions of the first insulating layer adjacent to those opposite end portions of the gate insulating film; the fixed charge of the insulator has a polarity equivalent to a conductivity type of the semiconductor; and the gate electrode is provided, via the gate insulating film, on a channel region of the semiconductor between the source region and the drain region as well as on a portion near the channel region of at least one of the source region and the drain region.