Patent ID: 8735256

Claim:
A method of using a heterojunction bipolar transistor, the method comprising: using a heterojunction bipolar transistor having an emitter, base, and collector with at least one current blocking native oxide layer or layers disposed within or between a layer or layers of at least the emitter, the base, or the collector, the native oxide blocking layer or layers comprising a native oxide of a compound which includes aluminum, arsenic (As) or phosphorous (P), and nitrogen (N); and providing power to the heterojunction bipolar transistor to provide in operational circuitry within an RF communications system, radar system, amplifier, or wireless device or system, wherein the native oxide blocking layer or layers comprises (AlxGa1−x)yIn1−yP with aluminum composition x between 0 and 1, and composition y between 0 and 1, with optional adjacent layers of (Alx′Ga1x′)yIn1−y′P with x′<x and 0≦y′≦1.