Patent ID: 8704298
Filing Date: 2014-04-22
Classification: H01L

Abstract:
1. A metal oxide semiconductor (MOS) diode with termination structure comprising: a substrate having at least a first conductive-type epitaxial layer and a plurality of mesas formed on the first conductive-type epitaxial layer; a plurality of etched shallow trenches surrounding the mesas; a plurality of second conductive-type semiconductor regions arranged in the etched shallow trenches; a plurality of gate oxide layers arranged on corresponding mesas; a plurality of polysilicon layers arranged on corresponding gate oxide layers; a plurality of shielding oxide layers arranged on corresponding polysilicon layers and covering at least partial surface of the polysilicon layers, a thickness of the shielding oxide layers being thicker than a thickness of the gate oxide layer; a termination structure comprising: a trench formed on the first conductive-type epitaxial layer; an oxide layer arranged at least in the trench; a sidewall polysilicon layer arranged on the oxide layer within the trench; and a metal layer covering the second conductive-type semiconductor regions, the polysilicon layers, the shielding oxide layers, the oxide layer in the trench and the sidewall polysilicon layer in the trench.