Patent ID: 9564515
Date: 2017-02-07
CPC Classifications: H01L

Claim:
1. A semiconductor device having a super junction structure, comprising: a substrate; an epitaxial layer of a first conductivity type over the substrate; a first trench in the epitaxial layer; a first doped region of a second conductivity type opposite to the first conductivity type in the epitaxial layer, the first doped region surrounding the first trench and in contact with a sidewall of the first trench; a second trench in the epitaxial layer and separated from the first trench and not in contact with the substrate; and a second doped region of the first conductivity type in the epitaxial layer and not in contact with the substrate, the second doped region surrounding the second trench and in contact with a sidewall of the second trench, wherein the second doped region has a dopant concentration greater than a dopant concentration of the epitaxial layer, and the second doped region has a second depth less than a first depth of the first doped region, and the epitaxial layer is laterally between the first doped region and the second doped region.