Patent ID: 8039864

Claim:
A semiconductor light emitting device comprising: a GaAs substrate structure including a GaAs layer forming a plurality of trench regions on a surface, a first metal buffer layer disposed on the surface of the GaAs layer, at a sidewall of the trench region, and on a bottom surface of the trench region, a first metal layer disposed on the first metal buffer layer, a second metal buffer layer disposed at a back side of the GaAs layer, and a second metal layer disposed on a surface of the opposite side with the GaAs layer of the second metal buffer layer; and a light emitting diode structure disposed on the GaAs substrate structure and including a third metal layer, a metal contact layer disposed on the third metal layer, a p type cladding layer disposed on the metal contact layer, a multi-quantum well layer disposed on the p type cladding layer, an n type cladding layer disposed on the multi-quantum well layer, and a window layer disposed on the n type cladding layer, wherein the GaAs substrate structure and the light emitting diode structure are bonded using the first metal layer and the third metal layer disposed on the surface of the GaAs layer, and an air gap exists between the first metal layer of the trench region and the third metal layer.