Patent ID: 9716151
Date: 2017-07-25
CPC Classifications: H01L

Claim:
1. A Schottky device, comprising: a semiconductor material of a first conductivity type having first and second major surfaces and a first concentration; a first trench having sidewalls and a floor, the first trench extending from the first major surface of the semiconductor material into a first portion of the semiconductor material; a second trench having sidewalls and a floor, the second trench extending from the first major surface of the semiconductor material into a second portion of the semiconductor material, wherein a third portion of the semiconductor material is between the first and second trenches and a seventh portion of the semiconductor material is adjacent the second trench, and wherein the third portion of the semiconductor material has a multi-concentration impurity profile comprising a first doped region of a second conductivity type and a second concentration extending from the first major surface of the semiconductor material into the third portion of the semiconductor material and a second doped region of the second conductivity type and a third concentration extending from the first doped region into the third portion of the semiconductor material, wherein a bottom of the second doped region is closer to the floor of the first trench than to the first major surface of the semiconductor material, and wherein the second concentration and the third concentration are selected so that a first portion of a first contact formed in contact with the third portion of the semiconductor material forms a first multi-concentration contact portion of the first contact and has electrical properties between a conventional Schottky contact and a conventional Ohmic contact, without being a conventional Schottky contact or a conventional Ohmic contact; the first contact formed in contact with the first major surface of the semiconductor material, the first portion of the first contact in contact with the third portion of the semiconductor material and a second portion of the first contact in contact with the seventh portion of the semiconductor material, wherein the first concentration is selected so that the second portion of the first contact forms a first Schottky contact portion of the first contact; and a second contact formed in contact with the second major surface of the semiconductor material.