Patent ID: 8310005
Filing Date: 2012-11-13
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor layer of a second conductive type; a first diffused region of a first conductive type formed in the semiconductor layer; a second diffused region of the second conductive type formed in the first diffused region; a trench formed in the semiconductor layer; a gate electrode disposed in the trench with a gate insulator intervening, a top surface of the gate electrode being lower than a top surface of the semiconductor layer and the top surface of the gate electrode sagging downwards in a center thereof; a non-doped silicate glass film disposed in the trench and formed over the gate electrode, a top surface of the non-doped silicate glass film sagging downwards in a center thereof; an oxide film disposed in the trench and formed over the non-doped silicate glass film, a top surface of the oxide film sagging downwards in a center thereof; and a source electrode formed over the semiconductor layer so that the source electrode contacts the first and second diffusion regions, and further contacts the oxide film at the top surface thereof.