Patent ID: 8716789
Filing Date: 2014-05-06
Classification: H01L

Abstract:
1. A power semiconductor device including an element portion in which power semiconductor elements are provided, and a termination portion provided around the element portion, the power semiconductor device comprising: a first-conductivity type semiconductor substrate; a second-conductivity type first impurity layer provided at a part of the element portion on an upper surface of the semiconductor substrate; a first-conductivity type second impurity layer provided at a part of an upper end of the first impurity layer; a gate electrode provided to become in contact with the first impurity layer via a gate insulation film; a first electrode provided on a lower surface of the semiconductor substrate; a second electrode provided to become in contact with at least the first impurity layer, on the upper surface of the semiconductor substrate; a plurality of second-conductivity type pillar layers that have respectively a band-shaped upper end exposed from an upper surface of the semiconductor substrate or a band-shaped upper end that is in contact with a lower end of the first impurity layer, and both first side ends and both second side ends that are connected to the band-shaped upper end, the plurality of pillar layers provided in the semiconductor substrate beneath the second electrode and the semiconductor substrate at the termination portion exposed from the second electrode, and are arrayed in parallel with each other; a first trench provided between portion that includes the first side ends of the plurality of pillar layers, the first trench provided in the semiconductor substrate at the termination portion exposed from the second electrode; and a first insulation film provided on a side surface and a bottom surface of the first trench.