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

Kong-Thon Tsen; Ravindra P. Joshi; David K. Ferry

doi:10.1117/12.306168

23 April 1998 Subpicosecond time-resolved Raman studies of nonequilibrium excitations in wide-bandgap GaN

Kong-Thon Tsen, Ravindra P. Joshi, David K. Ferry

Proceedings Volume 3277, Ultrafast Phenomena in Semiconductors II; (1998) https://doi.org/10.1117/12.306168
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

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 result show that for electron densities n greater than or equal to 5 X 10¹⁷ cm^-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.

Citation Download Citation

Kong-Thon Tsen, Ravindra P. Joshi, and David K. Ferry "Subpicosecond time-resolved Raman studies of nonequilibrium excitations in wide-bandgap GaN", Proc. SPIE 3277, Ultrafast Phenomena in Semiconductors II, (23 April 1998); https://doi.org/10.1117/12.306168

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