Patent ID: 8648387

Claim:
A nitride semiconductor template, comprising: a carrier substrate having a first thermal expansion coefficient; a nitride semiconductor layer disposed on the carrier substrate, a thickness of the nitride semiconductor layer being at least 10 μm, and the nitride semiconductor layer having a second thermal expansion coefficient different from the first thermal expansion coefficient; and a bonding layer disposed between the carrier substrate and the nitride semiconductor layer to adhere the nitride semiconductor layer onto the carrier substrate, and the bonding layer comprising a first bonding layer and a second bonding layer tightly adhered to each other, wherein a material of the first bonding layer comprises SiO 2 , SiN x , TiN, or TaN, a material of the second bonding layer comprises SiO 2 , SiN x , TiN, or TaN, an average dislocation density of the nitride semiconductor layer at a first surface is more than the average dislocation density of the nitride semiconductor layer at a second surface so that the ratio of the average dislocation density of the nitride semiconductor layer at a first surface to the average dislocation density of the nitride semiconductor layer at a second surface is not more than 10, while the second surface is near an interface between the nitride semiconductor layer and the bonding layer, and the first surface is at least 10 μm from the second surface.