Patent ID: 6979874

Claim:
A semiconductor device comprising: a semiconductor substrate of a first conductivity type; a plurality of trench portions selectively formed at a first main surface of said semiconductor substrate; a conductor embedded in each said trench portion with a first insulating layer there between; a plurality of impurity regions of a second conductivity type which is formed at a region between said trench portions and at said first main surface of said semiconductor substrate, in contact with at least one of opposite sides of adjacent trench portions and located shallower than said trench portion; and a first electrode layer formed on said first main surface of said semiconductor substrate, wherein; said first electrode layer and each said impurity region form an ohmic contact at said first main surface; each said impurity region has a minimum impurity concentration at a portion near said first main surface which enables ohmic contact with said first electrode layer, and has an impurity concentration still lower than said minimum impurity concentration which enables ohmic contact at a portion at said first main surface other than the portion near said first main surface; each said impurity region of the second conductivity type is in contact with at least the edge along the opening of the trench portion and the side, adjacent to the edge, of the trench portion, and each said impurity region of the second conductivity type is in direct contact with the semiconductor substrate of the first conductivity type; and each said impurity region is formed to be in contact with opposite sides of said trench portions adjacent to each other, and said first electrode layer and a region of the first conductivity type of said semiconductor substrate form a Schottky junction at said first main surface.