Patent ID: 8809085

Claim:
A method for manufacturing a nitride semiconductor device, the method comprising: removing a growth substrate of a structure body by using a buffer layer as an etching stop layer and dry etching with a first treatment material containing fluorine, the structure body having the growth substrate containing silicon, a buffer layer being a nitride containing aluminum and formed on a surface of the growth substrate, and a nitride semiconductor layer formed on the buffer layer unevenness not less than 2 micrometers being formed on a back face of the growth substrate by grinding the back face and reducing a thicknesses of the growth substrate after bonding a support substrate containing silicon to a side of the nitride semiconductor layer; and after the removing, forming a surface of the nitride semiconductor layer by removing the buffer layer and reducing a thickness of the nitride semiconductor layer using dry etching with a second treatment material containing chlorine, the unevenness being not transferred to the surface of the nitride semiconductor layer.