Patent ID: 9035283
Filing Date: 2015-05-19
Classification: H01L

Abstract:
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 conductive layer disposed in the first trench; a first insulating layer disposed between the first conductive layer and the epitaxial layer; a second conductive layer in a spacer form disposed on a sidewall of the second trench; a second 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 filling up the second trench; and two doped regions with the first conductivity type disposed in the body layer respectively beside the second trench.