Patent ID: 9711661
Date: 2017-07-18
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: a semiconductor layer made of a semiconductor; an insulating layer configured to have electric insulation property and formed to cover part of the semiconductor layer; a first electrode layer formed on the semiconductor layer, the first electrode being configured to have a work function of not less than 0.5 eV relative to electron affinity of the semiconductor layer and extended to a surface of the insulating layer to form a field plate structure; a second electrode layer configured to have electrical conductivity and formed to cover at least a part of the first electrode layer; and a third electrode layer formed between the first electrode layer and the second electrode layer to suppress diffusion of a metal, wherein a distance between an edge of the part of the first electrode layer that is in contact with the semiconductor layer and the insulating layer, and the second electrode layer is equal to or greater than 0.2 μm to thereby suppress a material of the second electrode layer from contacting the edge of the part of the first electrode layer that contacts the semiconductor layer, and wherein the second electrode layer is mainly made of aluminum wherein the first electrode layer covering a side wall of the insulating layer has a film thickness that is greater than a film thickness of the first electrode layer covering the insulating layer other than the side wall.