Patent ID: 8759911

Claim:
A semiconductor device, characterized by comprising: a first conductivity type semiconductor layer; a plurality of island-form cells provided distanced from each other on a first main surface of the first conductivity type semiconductor layer; a second conductivity type semiconductor region provided in the cell; a first conductivity type semiconductor region provided in the second conductivity type semiconductor region; a first insulating film provided inside a trench deeper than the second conductivity type semiconductor region formed on either side of the cell; a first electrode embedded in the trench across the first insulating film; a second insulating film provided on a surface of a region of the second conductivity type semiconductor region sandwiched by the first conductivity type semiconductor region; a second electrode, formed on the second insulating film, that electrically connects first electrodes; a third insulating film provided on a surface of the first conductivity type semiconductor layer; a conductive region, formed on the third insulating film, that electrically connects second electrodes; and a contact region that is isolated from the second electrode, and that short circuits the second conductivity type semiconductor region and the first conductivity type semiconductor region provided in the region, wherein the first conductivity type semiconductor layer is exposed on the first main surface.