Patent ID: 9620608
Date: 2017-04-11
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: a first titanium layer comprising titanium, the first titanium layer contacting with at least a part of a semiconductor layer, a surface of the first titanium layer abutting a surface of the semiconductor layer; an aluminum layer that is formed on the first titanium layer on an opposite side of the semiconductor layer and mainly consists of aluminum; a titanium nitride layer that is formed on the aluminum layer on an opposite side of the first titanium layer, the titanium nitride layer comprising titanium nitride; an electrode layer that is formed on the titanium nitride layer on opposite side of the aluminum layer, the electrode layer comprising copper; a second titanium layer that is formed between the aluminum layer and the titanium nitride layer, the second titanium layer comprising titanium; and a third titanium layer that is formed between the titanium nitride layer and the electrode layer, the third titanium layer comprising titanium, wherein the titanium nitride layer has a thickness of greater than 75 nm, and wherein the semiconductor layer comprises an n-type semiconductor of a Group III nitride.