Patent ID: 9105487
Filing Date: 2015-08-11
Classification: H01L

Abstract:
1. A super junction semiconductor device, comprising: a substrate layer of a first conductivity type; and an epitaxial layer adjoining the substrate layer and comprising first columns of the first conductivity type and second columns of a second conductivity type, which is the opposite of the first conductivity type, the first and second columns extending along a main crystal direction from a first surface opposite to the substrate layer into the epitaxial layer and having vertical dopant profiles perpendicular to the first surface, wherein the vertical dopant profile of at least one of the first and second columns includes first portions separated by second portions, in each of the first portions a dopant concentration is non-constant and varies by at most 30% of a maximum value within the respective first portion, in the second portions the dopant concentration is lower than in the adjoining first portions, and a ratio of a total length of the first portions to a total length of the first and second portions is at least 50%.