Patent ID: 9576946
Date: 2017-02-21
CPC Classifications: H01L

Claim:
1. A method of manufacturing a semiconductor device, comprising: providing a substrate; forming a first trough structure on the substrate, the first trough structure comprising at least a first sidewall; forming a first doping layer on the first sidewall; covering the first doping layer and a part of a surface of the substrate by a photoresist; forming a second trough structure on a part of the substrate which is not covered by the photoresist, the second trough structure comprising at least a second sidewall; removing the photoresist; forming an insulation layer on the substrate, the first trough structure, and the second trough structure, wherein a first part of the insulation layer is in the first trough structure and covers the first doping layer, and a second part of the insulation layer is in the second trough structure; forming a conductive layer on the substrate, the first trough structure, and the second trough structure, wherein a first part of the conductive layer is in the first trough structure and covers the first insulation layer, and a second part of the conductive layer is in the second trough structure and covers the second insulation layer; and removing parts of the insulation layer and the conductive layer that are outside the first trough structure and the second trough structure to expose a surface of the first doping layer at the opening of the first trough structure.