Patent ID: 8247310

Claim:
A method for making a GaN substrate, comprising steps of: providing a GaN single crystal substrate; forming an ion implanting layer inside the GaN single crystal substrate, the ion planting layer dividing the GaN single crystal substrate into a first section and a second section; providing an assistant substrate and a connecting layer and connecting the GaN single crystal substrate to the assistant substrate through the connecting layer; heating the GaN single crystal substrate to make the ion implanting layer decompounded; and separating the second section from the first section to have the first section left on a surface of the assistant substrate for growing a nitride semiconductor on the first section; wherein the method of forming the connecting layer comprises steps of: forming a first metal layer on a surface of the GaN single crystal substrate; forming a second metal layer on a surface of the assistant substrate; and connecting the first metal layer with the second metal layer to cooperatively form the connecting layer.