Patent ID: 9722020
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A super junction semiconductor device, comprising: a semiconductor portion with a first surface and a second surface parallel to the first surface, and comprising a doped layer of a first conductivity type formed at least in a cell area; columnar first super junction regions of a second, opposite conductivity type extending in a direction perpendicular to the first surface and separated by columnar second super junction regions of the first conductivity type, the first and second super junction regions forming a super junction structure between the first surface and the doped layer; a first electrode structure directly adjoining the first surface and a second electrode structure directly adjoining the second surface, the first electrode structure having a first thickness and the second electrode structure having a second thickness, wherein a sum of the first and second thicknesses is at least 20% of the thickness of the semiconductor portion between the first and second surfaces, auxiliary structures formed within a section between the first surface and a buried edge of the super junction structure oriented to the second surface, the auxiliary structures provided from a foreign material different from a first single-crystalline semiconductor material forming the semiconductor portion; and a stress relief portion with atoms of a second semiconductor material replacing atoms of the first semiconductor material in a crystal lattice of the single-crystal forming the semiconductor portion.