Patent ID: 8008714

Claim:
A semiconductor device including a MOSFET, comprising: a semiconductor substrate having a main surface and a back surface opposite to the main surface; a plurality of transistor cell regions disposed in the semiconductor substrate, each of the plurality of transistor cell regions including: a plurality of trenches disposed on the main surface of the semiconductor substrate, a well region in which a channel of the MOSFET is formed, disposed between the plurality of trenches, a gate insulating film of the MOSFET disposed in each of the plurality of trenches, a gate electrode of the MOSFET disposed over the gate insulating film in each of the plurality of trenches, and a source region of the MOSFET disposed in the well region; a source electrode of the MOSFET disposed over the main surface of the semiconductor substrate and being in contact with a top surface of the source region in each of the plurality of transistor cell regions, a drain electrode of the MOSFET disposed over the back surface of the semiconductor substrate and electrically connected to the semiconductor substrate; and a Schottky cell region disposed between the plurality of transistor cell regions in the semiconductor substrate, the source electrode being in contact with a part of the main surface of the semiconductor substrate so as to form a Schottky junction in the Schottky cell region, and the Schottky junction being located lower than a top surface of the source region.