Patent ID: 8581360

Claim:
A method for manufacturing a trench Schottky diode, the method comprising steps of: providing a semiconductor substrate; forming a plurality of first trenches and a plurality of second trenches in the semiconductor substrate, wherein the opening width of the first trench is greater than the opening width of the second trench; forming a plurality of doped regions in the semiconductor substrate and under respective first trenches; forming a gate oxide layer on a surface of the semiconductor substrate and surfaces of the first trenches and the second trenches; forming a polysilicon structure on the gate oxide layer; etching the polysilicon structure, so that the gate oxide layer within the first trenches and the second trenches is covered by the polysilicon structure; forming a mask layer to cover the polysilicon structure within the first trenches and the gate oxide layer within the first trenches; etching the semiconductor substrate, so that the surface of the semiconductor substrate uncovered by the mask layer is exposed; and forming a metal sputtering layer to cover a part of the surface of the semiconductor substrate, the polysilicon structure within the second trenches and a part of the mask layer.