Patent ID: 8884360

Claim:
A semiconductor device, comprising a semiconductor body comprising: a first surface defining a vertical direction; a drift region of a first conductivity type comprising a first maximum doping concentration and being arranged below the first surface; and, a semiconductor layer of the first conductivity type comprising a second maximum doping concentration which is lower than the first maximum doping concentration, the semiconductor layer adjoining the drift region and being arranged below the drift region, the semiconductor body further comprising in a vertical cross-section: a first body region of a second conductivity type adjoining the drift region, a source region of the first conductivity type adjoining the first body region and being arranged between the first surface and the first body region; a vertical trench extending from the first surface at least to the semiconductor layer, adjoining the source region, the first body region and the drift region, and comprising an insulated gate electrode; a first contact comprising at the first surface a first minimum width and being in low Ohmic contact with the source region and the first body region; a second body region of the second conductivity type which forms a pn-junction only with the drift region; and, a second contact in low Ohmic contact with the second body region and comprising at the first surface a second minimum width which is larger than the first minimum width.