Patent ID: 9331235
Filing Date: 2016-05-03
CPC Classification: H01L,H01S

Claim Text:
1. A method for manufacturing a semiconductor device comprising: forming a layer in contact with a first semiconductor layer of an n type including a nitride semiconductor, the layer including Al, Au and Ni; performing heat treatment in an inert gas atmosphere on the first semiconductor layer and the layer including the Al, Au and Ni to form a first metal layer including an alloy including Al, Au and Ni; forming a second metal layer including a metal different from Al on the first metal layer; and forming an insulating layer at a temperature of 350° C. or more on the second metal layer, wherein a ratio of Ni in the alloy is not less than 0.05 and not more than 0.14, a ratio of Al in the alloy is not less than 0.14 and not more than 0.34, a ratio of Au in the alloy is not less than 0.55 and not more than 0.84, and a total of the ratio of the Ni, the ratio of the Al, and the ratio of the Au is 1.