Patent ID: 9406795
Filing Date: 2016-08-02
CPC Classification: H01L

Claim Text:
1. A trench gate MOSFET, comprising: a substrate with a first conductivity type; an epitaxial layer with the first conductivity type disposed on the substrate; a body layer with a second conductivity type disposed in the epitaxial layer, wherein the epitaxial layer has a first trench therein, the body layer has a second trench therein, and the first trench is disposed below the second trench; a first insulating layer disposed on a surface of the first trench; a first conductive layer disposed in the first trench and having a bowl shape or U-shape; a second insulating layer disposed in the first trench and being completely separated from the first insulating layer by the bowl-shaped or U-shaped first conductive layer; a second conductive layer disposed in the second trench; a third insulating layer disposed between the second conductive layer and the body layer, and between the second conductive layer and the first conductive layer; a dielectric layer disposed on the epitaxial layer and directly covering the second conductive layer; and two doped regions with the first conductivity type disposed in the body layer respectively beside the second trench.