Patent ID: 8643091
Filing Date: 2014-02-04
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor layer of a first conductivity type; a second semiconductor layer of a second conductivity type provided on the first semiconductor layer; a third semiconductor layer of the first conductivity type provided on the second semiconductor layer; an embedded electrode provided in a first trench via a first insulating film, the first trench penetrating through the second semiconductor layer from a surface of the third semiconductor layer to reach the first semiconductor layer; a control electrode provided above the embedded electrode via a second insulating film in the first trench; a fourth semiconductor layer of the second conductivity type selectively provided in the first semiconductor layer and connected to a lower end of a second trench, the second trench penetrating through the second semiconductor layer from the surface of the third semiconductor layer to reach the first semiconductor layer; a first main electrode electrically connected to the first semiconductor layer; and a second main electrode provided in the second trench and connected to the second semiconductor layer, the third semiconductor layer and the fourth semiconductor layer, the embedded electrode being electrically connected to one of the second main electrode and the control electrode, a Schottky junction formed of the second main electrode and the first semiconductor layer being formed at a sidewall of the second trench.