Patent ID: 8618626

Claim:
A trench Schottky rectifier device comprising: a substrate having a first conductivity type; a first plurality of trenches and a second plurality of trenches formed in the substrate; an insulating layer formed on sidewalls of the first plurality of trenches and the second plurality of trenches; a first plurality of conductive structures formed in the first plurality of trenches and a second plurality of conductive structures formed in the second plurality of trenches; an isolation layer covered on a first portion of the substrate and the first plurality of conductive structures; an electrode overlying the isolation layer, the second plurality of conductive structures and a second portion of the substrate, wherein a Schottky contact forms between the electrode and the second portion of the substrate; and a plurality of doped regions having a second conductivity type formed in the substrate and located under the first plurality of trenches and the second plurality of trenches, and in contact with the first plurality of conductive structures and the second conductive structures in the first plurality of trenches and the second plurality of trenches; wherein the isolation layer further comprises a first oxide layer covered on the first portion of the substrate and a second oxide layer covered on the first oxide layer and the first plurality of conductive structures, wherein the trench Schottky rectifier device further comprises an adhesion layer disposed between the second oxide layer and the electrode on the first portion of the substrate and disposed between the electrode and the second plurality of conductive structures on the second portion of the substrate.