Patent ID: 9373728
Filing Date: 2016-06-21
CPC Classification: H01L

Claim Text:
1. A trench MOS PN junction diode structure, comprising: a first conductive type substrate; a plurality of trenches defined on a face of the first conductive type substrate; a gate oxide layer formed at least on inner sidewalls of the trenches; a polysilicon layer formed in the trenches, the gate oxide layer covering at least part of lateral face of the polysilicon layer; a second conductive type low-concentration ion-implanted region formed at least in the first conductive type substrate and outside the gate oxide layer; a second conductive type high-concentration ion-implanted region formed below the trenches, wherein the second conductive type high-concentration ion-implanted region formed has higher dosage concentration than that of the second conductive type low-concentration ion-implanted region; and an electrode layer covering the first conductive type substrate, the second conductive type low-concentration ion-implanted region, the gate oxide and the polysilicon layer; wherein the second conductive type low-concentration ion-implanted region is not connected with the second conductive type high-concentration ion-implanted region; wherein the second conductive type low-concentration ion-implanted regions of adjacent trenches are not in contact with each other; wherein the second conductive type high-concentration ion-implanted region has dosage of 10