Patent ID: 9455248
Filing Date: 2016-09-27
CPC Classification: H01L

Claim Text:
1. A semiconductor device having a schottky diode, the semiconductor device comprising: an epitaxial layer of a first conductivity type, a body layer of a second conductivity type, and a source layer of the first conductivity type arranged in that order; a gate trench extending from the source layer to a part of the epitaxial layer; a body trench formed at a predetermined distance from the gate trench and extending from the source layer to a part of the epitaxial layer; a barrier metal formed along an inner wall of the body trench; a source metal formed on the barrier metal; and a guard ring of the second conductivity type contacting the barrier metal and formed in the epitaxial layer, and wherein a bottom surface of the body trench is in direct contact with the epitaxial layer, such that the bottom surface of the body trench forms a schottky contact with the epitaxial layer, and a portion of the guard ring is formed below a junction between the body layer and the epitaxial layer.