Patent ID: 9041101
Filing Date: 2015-05-26
Classification: H01L

Abstract:
1. A power semiconductor device including an element portion, and a termination portion provided around the element portion, the power semiconductor device comprising: a semiconductor substrate of a first-conductivity type, the semiconductor substrate having an upper surface and a lower surface; a first impurity layer of a second-conductivity type that is provided in the element portion at the upper surface of the semiconductor substrate; a second impurity layer of the first-conductivity type that is provided on an upper end of the first impurity layer at the upper surface of the semiconductor substrate; a gate electrode separated from the first impurity layer by a gate insulation film; a first electrode provided on the lower surface of the semiconductor substrate; a second electrode in contact with the first impurity layer and on the upper surface of the semiconductor substrate; a plurality of pillar layers of the second-conductivity type provided in the semiconductor substrate in the element portion and the termination portion, each pillar layer extending along a direction across the element portion into the termination portion; and a first insulation film provided in the semiconductor substrate in the termination portion, the first insulation film being provided between pillar layers in the plurality of pillar layers that are adjacent to each other.