Patent ID: 7468103

Claim:
A method of manufacturing a gallium nitride-based single crystal substrate, comprising: a) preparing a zinc oxide (ZnO) substrate; b) primarily growing a gallium nitride-based (Al x In y Ga (1−x−y) N, where 0≦x≦1, 0≦y≦1, 0≦x+y≦1) single crystal layer on the ZnO substrate at a temperature of about 500° C. to 600° C.; and c) secondarily growing an additional gallium nitride-based single crystal layer on the primarily grown gallium nitride-based single crystal layer at a temperature of 900° C.˜1,150° C., while removing the ZnO substrate by etching the underside of the ZnO substrate, wherein the ZnO substrate has a thickness of about 150 μm or less and the primarily grown gallium nitride-based single crystal has a thickness of about 50 μm˜150 μm.