Subpicosecond time-resolved Raman studies of non-equilibrium excitations in wide bandgap GaN

K. T. Tsen, R. P. Joshi, D. K. Ferry

Research output: Contribution to journalConference article

Abstract

We have studied non-equilibrium electron distributions and electron-longitudinal optical phonon scattering rates in wurtzite GaN 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.

Original languageEnglish
Pages (from-to)304-313
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3277
DOIs
StatePublished - 1998
EventUltrafast Phenomena in Semiconductors II - San Jose, CA, United States
Duration: Jan 28 1998Jan 29 1998

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