Patent ID: 9564504
Date: 2017-02-07
CPC Classifications: H01L

Claim:
1. A method of manufacturing a semiconductor device, comprising: forming an ohmic electrode on a nitride semiconductor layer, the edge of the ohmic electrode consists of a first electrode, a second electrode and a coating metal layer; performing a thermal treatment to the ohmic electrode, wherein the first electrode is composed of Ti or Ta, the second electrode is composed of Al and the coating metal layer is composed of at least one of Ta, Mo, Pd, Ni, and Ti, and wherein a structure having the first electrode, the second electrode, and the coating metal layer constitutes at least one of a source electrode and a drain electrode arranged next to a gate electrode and wherein the coating metal layer is arranged on at least one of an edge of a top face of the second electrode and a side face of the second electrode on a side near to the gate electrode.