Patent ID: 8405184
Filing Date: 2013-03-26
Classification: H01L

Abstract:
1. A trench Schottky diode comprising: a semiconductor substrate having a first plurality of trenches and a second plurality of trenches; a first plurality of gate oxide layers correspondingly formed on surfaces of the first plurality of trenches and protruding above a first surface of the semiconductor substrate; a second plurality of gate oxide layers correspondingly formed on surfaces of the second plurality of trenches and protruding above a first surface of the semiconductor substrate; a first plurality of polysilicon structures correspondingly filled in the first plurality of trenches and protruding above the first surface of the semiconductor substrate; a second plurality of polysilicon structures correspondingly filled in the second plurality of trenches and protruding above the first surface of the semiconductor substrate; a first masking layer on a portion of the first surface among the first plurality of trenches and covering the first surface among the first plurality of trenches and the first plurality of gate oxide layer; a second masking layer on said first masking layer and said first plurality of polysililcon structure, and completely covering the first masking layer; and an electrode formed on the guard ring, the other portion of the first surface, the second number of the protruding polysilicon structures and the second number of the protruding gate oxide layers.