Patent ID: 8441036
Filing Date: 2013-05-14
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate of a first conductive-type; a hetero semiconductor region adjoined to a main surface of the semiconductor substrate; a trench formed in the semiconductor substrate and the hetero semiconductor region, the trench having a first width in the semiconductor substrate and a second width in the hetero semiconductor region wherein the second width is wider than the first width such that the main surface of the semiconductor substrate is exposed on each side of the trench as a transition portion between the first width and the second width, the hetero semiconductor region forming a heterojunction with the semiconductor substrate; a gate electrode disposed in the trench using a gate insulating film; a source electrode connected to the hetero semiconductor region; a drain electrode connected to the semiconductor substrate; and a driving point of the semiconductor substrate where the gate insulating film, the hetero semiconductor region and the transition portion of the semiconductor substrate are adjoined on each side of the trench.