Patent ID: 8878327

Claim:
A Schottky barrier device, comprising: a semiconductor substrate, having a first surface and a second surface positioned oppositely, and a plurality of trenches formed on the first surface, each trench comprising a first recess having a first depth and a second recess having a second depth, the second recess extending down from the first surface, the first recess extending down from the second recess, and the first depth larger than the second depth; a first contact metal layer at least formed on a surface of the second recess; a second contact metal layer formed on the first surface and between two adjacent trenches; and an insulating layer formed on a surface of the first recess, wherein the first contact metal layer extends to cover the second contact metal layer, wherein a first Schottky barrier is formed between the first contact metal layer and the semiconductor substrate, a second Schottky barrier is formed between the second contact metal layer and the semiconductor substrate, and the first Schottky barrier is larger than the second Schottky barrier.