Patent ID: 8043906

Claim:
A method for forming a III-nitride selective current carrying device, comprising: providing a substrate; forming a III-nitride layer over the substrate with a first in-plane lattice constant; forming another III-nitride layer over the III-nitride layer, the another III-nitride layer having a second in-plane lattice constant that is less than the first in-plane lattice constant, whereby a conduction channel is created near a junction of the III-nitride layer and the another III-nitride layer; forming a first ohmic contact over a first region of the another III-nitride layer and a second ohmic contact over a second region of the another III-nitride layer; defining a recess in the another III-nitride layer between the first region and the second region of the another III-nitride layer, the recess having sloping sidewalls and extending partially into the another III-nitride layer such that the conduction channel beneath the recess is interrupted to obtain a nominally off device; and forming a contact in the recess that extends over at least one of the sloping sidewalls to and directly overlays the first ohmic contact.