Semiconductor device

摘要

The semiconductor device of the present invention includes a semiconductor region made of a material to which conductive impurities are added, an insulating film formed on a surface of the semiconductor region, and an electroconductive gate electrode formed on the insulating film. The gate electrode is made of a material whose Fermi level is closer to a Fermi level of the semiconductor region than a Fermi level of Si in at least a portion contiguous to the insulating film.

主权项

1. A semiconductor device comprising:
a SiC substrate; an epitaxial layer formed on a side of one surface of the SiC substrate; a gate trench dug downwardly from a principal plane of the epitaxial layer, the gate trench having a side surface having an inclination of 0° to 1° with respect to a virtual surface perpendicular to the principal plane of the epitaxial layer, a body region formed beside the gate trench, and a gate electrode facing the body region via a gate insulating film formed on the side surface of the gate trench, along the inclination, the gate electrode having a two-layer structure including a first layer and a second layer, wherein an off-angle of the SiC substrate is less than 4° exceeding 0°, and a thickness of a bottom portion of the gate insulating film is greater than a thickness of a side portion of the gate insulating film.