Patent ID: 9660134
Date: 2017-05-23
CPC Classifications: H01L

Claim:
1. A device comprising: a first layer comprising a group III-nitride semiconductor substrate or template; a second group III-nitride semiconductor layer disposed over the group III-nitride semiconductor substrate or template; a third group III-nitride semiconductor layer disposed over the second group III-nitride semiconductor layer; a fourth group III-nitride semiconductor layer disposed over the third group III-nitride semiconductor layer; a pn junction at an interface between the third and fourth group III-nitride semiconductor layers; and a polarization hetero-junction between the second group III-nitride semiconductor layer and the third group III-nitride semiconductor layer, the polarization junction having fixed charges of a polarity on one side of the polarization junction and fixed charges of an opposite polarity on an opposite side of the polarization junction; wherein, when unbiased, the pn junction comprises a first electric field that opposes the flow of carriers across the pn junction and the polarization junction comprises a second electric field that opposes the flow of oppositely charged carriers across the polarization junction.