Electronic devices with ultra-high dielectric constant passivation and high mobility materials

An apparatus comprising:

• a channel layer configured for conducting current to a drain contact;
• a barrier layer in electrical communication with the channel layer;
• a gate contact in electrical communication with the barrier layer and controlling, at least in part, the current in the channel layer;
• wherein at least a junction portion of the barrier layer is adjacent the gate contact and the drain contact, and the junction portion of the barrier layer is configured with a junction dielectric permittivity that is greater than a channel dielectric permittivity of the channel layer, and
• wherein the junction portion comprises a dielectric that polarizes carriers within the junction portion such that excess charge on the gate is compensated by an opposite charge in the junction portion of the barrier layer proximate the gate, and
• wherein the junction dielectric permittivity polarizes carriers within the junction portion of the barrier layer such that sheet charge in the barrier layer is increased to form a depletion region with the channel layer that avoids a conductive parallel channel in the barrier layer to the drain contact.