Patent ID: 7378334

Claim:
A fabrication method of a nitride semiconductor devices, comprising: forming an under layer comprising GaN on a first face of a substrate for growing nitride semiconductor, the substrate for growing nitride semiconductor having a second face that mutually opposes the first face; forming a stack of nitride semiconductor by growing one or more n-type nitride semiconductor layers, an active layer having a quantum well structure comprising a well layer of Al a In b Ga 1−a−b N, (0≦a≦1, 0≦b≦1, a+b≦1) and a barrier layer of Al c In d Ga 1−c−d N, (0≦c≦1, 0≦d≦1, c+d≦1), and one or more p-type nitride semiconductor layers on the under layer, wherein the substrate for growing nitride semiconductor has a thermal expansion coefficient higher than those of said n-type and p-type nitride semiconductor layers, and the active layer has a luminescence wavelength of 380 nm or shorter; forming a first bonding layer including one or more metal layers on said p-type nitride semiconductor layers; forming a second bonding layer including one or more metal layers on a first face of a supporting substrate having a second face that mutually opposes the first face and having a thermal expansion coefficient higher than those of said n-type and p-type nitride semiconductor layers and equal to or smaller than that of said substrate for growing nitride semiconductor; bonding the first bonding layer and the second bonding layer by setting said first bonding layer and said second bonding layer to face each other, pressing said stack of nitride semiconductor and said supporting substrate together, and applying heat; and removing said substrate for growing nitride semiconductor from said stack of the nitride semiconductor.