Patent ID: 8981465
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A trench Schottky diode, comprising: a semiconductor substrate with a plurality of trenches, wherein the plurality of trenches comprise a wide trench at a first side of the semiconductor substrate and a plurality of narrow trenches at a second side of the semiconductor substrate; a first oxide layer formed on a surface the semiconductor substrate and located at bilateral sides of the wide trench; a gate oxide layer formed on surfaces of the plurality of trenches and protruded over the surface the semiconductor substrate; a polysilicon structure formed on the gate oxide layer within the narrows trenches and formed on the gate oxide layer at a sidewall and a part of a bottom surface of the wide trench, wherein the polysilicon structure is protruded over the surface the semiconductor substrate; a second oxide layer formed on the first oxide layer, a part of the polysilicon structure and a part of the gate oxide layer; and a metal sputtering layer formed on the second oxide layer, the semiconductor substrate, the polysilicon structure and a part of the gate oxide layer.