Abstract
Non-equilibrium electron distributions and electron-longitudinal optical phonon scattering rates in wurtzite GaN have been studied by subpicosecond time-resolved Raman spectroscopy. Our experimental results show that for electron densities n≥5×1017cm−3, the non-equilibrium electron distributions in wurtzite GaN can be very well described by Fermi-Dirac distribution functions with the effective electron temperature much higher than the lattice temperature. In addition, we find that the total electron-longitudinal optical phonon scattering rate in GaN is about one order of magnitude larger than that in GaAs. We attribute this enormous increase in the electron-longitudinal optical phonon scattering rate to the much larger ionicity in GaN.
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Tsen, K.T., Ferry, D.K., Botchkarev, A. et al. Non-equilibrium electron distributions and electron-longitudinal optical phonon scattering rates in wurtzite GaN. J. Electron. Mater. 27, 171–174 (1998). https://doi.org/10.1007/s11664-998-0381-z
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DOI: https://doi.org/10.1007/s11664-998-0381-z