Polar optical phonon scattering and negative Kromer-Esaki-Tsu differential conductivity in bulk GaN
Date
2001-09Source Title
Journal of Crystal Growth
Print ISSN
0022-0248
Publisher
Elsevier
Volume
230
Issue
4-Mar
Pages
462 - 466
Language
English
Type
ArticleItem Usage Stats
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Abstract
GaN is being considered as a viable alternative semiconductor for high-power solid-state electronics. This creates a demand for the characterization of the main scattering channel at high electric fields. The dominant scattering mechanism for carriers reaching high energies under the influence of very high electric fields is the polar optical phonon (POP) emission. To highlight the directional variations, we compute POP emission rates along high-symmetry directions for the zinc-blende and wurtzite crystal phases of GaN. Our treatment relies on the empirical pseudopotential energies and wave functions. The scattering rates are efficiently computed using the Lehmann-Taut Brillouin zone integration technique. For both crystal phases, we also consider the negative differential conductivity possibilities associated with the negative effective mass part of the band structure. (C) 2001 Elsevier Science B.V. All rights reserved.
Keywords
Computer SimulationNitrides
Semiconducting Iii-v Materials
High Electron Mobility Transistors