Patent ID: 8956940
Filing Date: 2015-02-17
Classification: H01L

Abstract:
1. A method for making an insulator termination semiconductor device, comprising: a) applying a trench mask to a semiconductor substrate; b) etching the semiconductor substrate through the trench mask to form trenches TR c) forming a gate dielectric in the trenches TR d) depositing a conductive material into the trenches TR e) isotropically etching back the conductive material to form gate electrodes in the trenches TR f) filling the trench TR g) forming a body layer in a top portion of the entire substrate; h) forming a source layer in a top portion of the entire body layer; wherein portions of the source layer and body layer inside a region surrounded by the isolation trench are at source potential and portions of the source layer and body layer that are outside the region surrounded by the isolation trench are at drain potential.