Patent ID: 8742459

Claim:
A III-N device, comprising: a buffer layer; a first III-N material layer on the buffer layer; a second III-N material layer on the first III-N material layer on an opposite side from the buffer layer, wherein the first III-N material layer is a channel layer and a compositional difference between the first III-N material layer and the second III-N material layer induces a 2DEG channel in the first III-N material layer; and a dispersion blocking layer between the buffer layer and the channel layer; wherein a sheet or a distribution of negative charge at an interface of the channel layer and the dispersion blocking layer confines electrons away from the buffer layer; a band-edge discontinuity at the interface of the channel layer and the dispersion blocking layer results in a conduction band edge directly adjacent to the interface being higher in the dispersion blocking layer than in the channel layer; a conduction band minimum of the dispersion blocking layer is within the dispersion blocking layer and away from the interface; and the dispersion blocking layer is doped with Fe, Mg, Be, C, or Zn.