Patent ID: 9595616
Date: 2017-03-14
CPC Classifications: H01L

Claim:
1. A method for fabricating a vertical III-nitride thin-film power diode, comprising: providing a growth substrate having a bandgap; a growing a template layer on the growth substrate; growing a high-doped n-type AlGaN bottom layer on the template layer, wherein the high-doped n-type AlGaN bottom layer has a smaller bandgap energy than the bandgap energies of the template layer and the growth substrate; growing a low-doped n-type AlGaN drift layer on the high-doped n-type AlGaN bottom layer; growing a top contact on the low-doped n-type AlGaN drift layer; bonding a host substrate to the top contact; and exposing the high-doped n-type AlGaN bottom layer through the growth substrate and the template layer to a light source having energy greater than the bandgap energy of the high-doped n-type AlGaN bottom layer but less than the bandgap energies of the template layer and the growth substrate, thereby causing the high-doped n-type AlGaN bottom layer to heat and separate from the template layer and growth substrate due to a difference in thermal expansion.