A device including a III-N material is described. In an example, the device has a terminal structure with a central body and a first plurality of fins, and a second plurality of fins, opposite the first plurality of fins. A polarization charge inducing layer including a III-N material in the terminal structure. A gate electrode is disposed above and on a portion of the polarization charge inducing layer. A source structure is on the polarization charge inducing layer and on sidewalls of the first plurality of fins. A drain structure is on the polarization charge inducing layer and on sidewalls of the second plurality of fins. The device further includes a source structure and a drain structure on opposite sides of the gate electrode and a source contact on the source structure and a drain contact on the drain structure.
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