Patent ID: 7749325
Filing Date: 2010-07-06
Classification: B24B,C30B,H01L,Y10S

Abstract:
1. A method of producing a GaN crystal body for forming a GaN substrate, the GaN crystal body being grown by vapor phase epitaxy on a substrate made of material different from GaN, the growth resulting in forming a nitride deposit on the GaN crystal body and a side face of the substrate, the method comprising the steps of: grinding a peripheral part of the nitride deposit by machining to remove a first outer periphery part of the nitride deposit on the side face of the GaN crystal body and a second outer periphery part of the nitride deposit on the side face of the substrate, a first inner periphery part of the nitride deposit being left on the side face of the GaN crystal body and a second inner periphery part of the nitride deposit being left on the side face of the substrate; after the grinding by machining, removing the substrate by etching; after removing the substrate, removing the second inner periphery part of the nitride deposit; and after the removal of the second inner periphery part, removing the first inner periphery part of the nitride deposit by machining to form the GaN crystal body.