Patent ID: 7332795
Filing Date: 2008-02-19
Classification: H01L

Abstract:
1. A semiconductor device comprising: a layer of Group III nitride semiconductor material that includes at least one surface; a control contact on said surface for controlling the electrical response of said semiconductor material; an ohmic contact on said surface for providing a conductive path through the device; a dielectric barrier layer having a thickness between about 5 nm and about 200 nm covering said surface between said control contact and said ohmic contact, said dielectric barrier layer having a bandgap greater than the bandgap of said Group III nitride and a conduction band offset from the conduction band of said Group III nitride; and a dielectric protective layer covering said barrier layer, said dielectric protective layer having a bandgap narrower than the bandgap of said dielectric barrier layer and greater than the bandgap of said Group III nitride.