Patent ID: 9577117
Date: 2017-02-21
CPC Classifications: H01L

Claim:
1. A semiconductor chip, comprising: a first metallic layer; a second metallic layer; a substrate layer containing a high dopant concentration of a first dopant type, provided between the first metallic layer and the second metallic layer; an epitaxial layer having a dopant concentration of the first dopant type, provided between the substrate layer and the first metallic layer; at least one trench provided in the epitaxial layer that is filled with semiconductor material having a dopant concentration of a second dopant type; at least one dielectric layer provided between the semiconductor material of the first dopant type in the epitaxial layer and the semiconductor material of the second dopant type used to fill the trench; a shielding layer having a dopant concentration of the second dopant type provided between the semiconductor material of the first dopant type of the epitaxial layer and the first metallic layer, wherein the shielding layer is doped in a sufficiently shallow and weak manner such that a sequence of the first metallic layer, the shielding layer, and the epitaxial layer of the first dopant type forms a Schottky contact in which the shielding layer is located under a Schottky contact situated between the first metallic layer and the semiconductor material of the first dopant type; and a contacting layer having a dopant concentration of the second dopant type that is higher than the dopant concentration of the semiconductor material of the second dopant type used to fill the trench and provided between the semiconductor material of the second dopant type used to fill the trench and the first metallic layer, wherein the contacting layer forms an ohmic contact with the first metallic layer.