Patent ID: 9722041
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A breakdown voltage blocking device comprising: an epitaxial region located above a substrate; a first trench and a second trench formed in said epitaxial region, each of said first and second trenches comprising a dielectric layer surrounding and covering a conductive region, a first mesa formed by said first and second trenches; a first contact region located in an upper surface of said first mesa; a second contact region located in an upper surface of said epitaxial region and located adjacent to said first trench; a third trench formed in said epitaxial region, said third trench comprising a dielectric layer that lines the sidewalls and bottom of said third trench and a conductive region located between said dielectric layer, a second mesa formed by said second and third trenches, said second mesa is free of a contact region; a dielectric layer formed over said second mesa and contacting said dielectric layer of said second trench and said dielectric layer of said third trench; a first metal formed over said first and second trenches and said first and second contact regions; and a second metal formed over said third trench.