Patent ID: 8383494
Filing Date: 2013-02-26
Classification: C30B

Abstract:
1. A method for forming a buffer layer for growing gallium nitride single crystals on a sapphire substrate using hydride vapor phase epitaxy (HVPE), wherein the buffer layer is formed in the form of an undoped vertical gallium nitride (GaN) single crystal film with a nanoporosity of 0.10 to 0.15 μm on the sapphire substrate by reacting HCl and NH 3 as a Group III/V mix gas, wherein the method comprises: first reacting HCl and NH second reacting HCl and NH third reacting HCL and NH treating the film grown by the third reaction of HCl and NH treating the film treated with nitride with gallium chloride (GaCl) for 10 to 20 minutes; and repeating the previous second reaction of HCl and NH wherein the method further comprises treating the sapphire substrate with gallium chloride (GaCl) at a temperature of 500 to 1,200° C., before the formation of the buffer layer.