Patent ID: 7524692

Claim:
A method for fabricating a nitride layer comprising steps of: preparing a sapphire substrate; forming a buffer layer made of a material having a melting point and a thermal conductivity higher than those of nitride on the sapphire substrate; forming the nitride layer on the buffer layer; and irradiating a laser beam to an underside of the sapphire substrate to remove the nitride layer, wherein the laser beam irradiating step comprises: irradiating a laser beam having an intensity expressed by an equation below to the underside of the sapphire substrate to remove the nitride layer at an interface between the buffer layer and the nitride layer, I = I n e - α ⁢ ⁢ Z wherein I is an intensity of the irradiated laser beam, I N is an intensity of the laser beam required to partially decompose the nitride layer, α is an absorption coefficient of the laser beam, and Z is a thickness of the buffer layer.