Studies of longitudinal optical phonons in GaN by subpicosecond time-resolved Raman spectroscopy

K. T. Tsen; Juliann G. Kiang; D. K. Ferry; H. Morkoç

doi:10.1117/12.703696

8 February 2007 Studies of longitudinal optical phonons in GaN by subpicosecond time-resolved Raman spectroscopy

K. T. Tsen, Juliann G. Kiang, D. K. Ferry, H. Morkoç

Proceedings Volume 6471, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV; 64710X (2007) https://doi.org/10.1117/12.703696
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

The lifetime of longitudinal optical phonon mode in GaN has been measured by subpicosecond time-resolved Raman spectroscopy for photoexcited electron-hole pair density ranging from 10¹⁶ cm^-3 to 2x10¹⁹cm^-3 and at T = 300K. The lifetime has been found to decrease from 2.5 ps, at the lowest density to 0.35 ps, at the highest density. Possible mechanism for this observation has been discussed. Our experimental findings help resolve the recent controversy over the lifetime of LO phonon mode in GaN.

Citation Download Citation

K. T. Tsen, Juliann G. Kiang, D. K. Ferry, and H. Morkoç "Studies of longitudinal optical phonons in GaN by subpicosecond time-resolved Raman spectroscopy", Proc. SPIE 6471, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV, 64710X (8 February 2007); https://doi.org/10.1117/12.703696

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