Patent ID: 7262477
Filing Date: 2007-08-28
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate with a trench, the semiconductor substrate comprising a first semiconductor layer of a first conductivity type and a second semiconductor layer disposed above the first semiconductor layer, and the second semiconductor layer including a particulate insulating layer filling at least a lower portion of the trench and comprising insulating particles, wherein an average diameter of the insulating particles falls within a range of 100 nm to 500 nm or a range of 100 nm to half a width of opening of the trench; a reflowable dielectric layer covering an upper surface of the particulate insulating layer, the insulating particles being stable at a melting point or a softening point of the reflowable dielectric layer; a gate electrode facing a portion of the base region interposed between the first impurity diffusion region and the source region; a gate insulating film interposed between the gate electrode and the base region; a source electrode covering the source region; and a drain electrode covering the first semiconductor layer, the drain and source electrodes sandwiching the semiconductor substrate.