Patent ID: 9711357
Date: 2017-07-18
CPC Classifications: H01L

Claim:
1. A method of manufacturing a semiconductor device in a semiconductor body, the method comprising: (a) forming an initial mask on a process surface of a semiconductor layer, the initial mask comprising openings exposing a part of the semiconductor layer in an alignment structure area and in a super-junction structure area; (b) forming a recess structure in the semiconductor layer at portions of the process surface that are exposed by the openings of the initial mask, wherein the recess structure in the alignment structure area constitutes an initial alignment structure comprising a recess with a minimum width of at least 100 μm and a vertical extension in a range from 100 nm to 1 μm, and at least one fin formed within a groove at a distance of at least 60 μm to a closest inside corner of the groove; (c) introducing dopants into the semiconductor layer through portions of the process surface that are exposed by the openings of the initial mask, wherein the dopants introduced in the super-junction area constitute part of a super-junction structure; (d) increasing a thickness of the semiconductor layer by growing an epitaxial layer, wherein the initial alignment structure is imaged into the process surface; (e) introducing dopants into the semiconductor layer by using a mask aligned to the initial alignment structure; and (f) repeating (d).