Time-resolved picosecond absorption spectroscopy of the layered compound gallium selenide

S. S. Yao; J. Buchert; R. R. Alfano

doi:10.1103/PhysRevB.25.6534

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Time-resolved picosecond absorption spectroscopy of the layered compound gallium selenide

S. S. Yao, J. Buchert, and R. R. Alfano

Ultrafast Spectroscopy and Laser Laboratory, Physics Department, The City College of New York, New York, New York 10031

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Phys. Rev. B 25, 6534(R) – Published 15 May, 1982

DOI: https://doi.org/10.1103/PhysRevB.25.6534

Abstract

The picosecond excite-and-probe absorption technique was used to study the relaxation process of photogenerated hot carriers in $ε$ -GaSe at room temperature. The time dependence of the carrier temperature to relax to the lattice temperature was calculated from the absorption kinetic data. The carriers cooled at the rate of 30 K/ps. The dominant relaxation mechanism of the photogenerated hot carriers in GaSe is attributed to the emission of nonpolar optical phonons $A_{1}^{' (1)}$ . A smaller value for the deformation potential extracted from the measurements is attributed to the screening of hole-phonon interaction by the photogenerated carrier density.

References (16)

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Omitted endnote

[c1] J. L. Staehli and A. Frova, Physica (Utrecht) 99B, 299 (1980)

[c2] Ph. Schmid, Nuovo Cimento B 21, 258 (1974)

[c3] M. Schlueter, Nuovo Cimento B 13, 313 (1973)

[c4] Ph. Schmid and J. P. Voitchovsky, Phys. Status Solidi. (b) 65, 249 (1974)

[c5] V. Angelli, C. Manfredotti, R. Murri, and L. Vasanelli, Phys. Rev. B 17, 3221 (1978)

[c6] G. Antoninoli, D. Bianchi, U. Emiliani, P. Podini, and P. Franzoni, Nuovo Cimento B 54, 211 (1979)

[c7] J. Shah and R. F. Leheny, Phys. Rev. B 16, 1577 (1977)

[c8] A. G. Doukas, V. Stefancic, J. Buchert, R. R. Alfano, and B. A. Zilinskas, Photochem. Photobiol. 34, 505 (1981)

[c9] S. S. Yao and R. R. Alfano (unpublished)

[c10] B. L. Evans, in Optical and Electrical Properties (D. Reidel Publishing, Boston, 1976), Vol. 4

[c11] T. Ugumori, K. Masuda, and S. Namba, J. Phys. Soc. Jpn. 41, 1991 (1976)

[c12] K. Arya and W. Hanke, Phys. Rev. B 23, 2988 (1981)

[c13] R. Ulbrich, Phys. Rev. B 8, 5719 (1973)

[c14] G. Ottaviani, C. Canali, F. Nova, Ph. Schmid, E. Mooser, R. Minder, and I. Zschokke, Solid State Commun. 14, 933 (1974)

[c15] E. M. Conwell, in Solid State Physics, edited by F. Seitz, D. Turnbull, and H. Ehrenreich (Academic, New York, 1967), Suppl 9, p. 155

[c16] Omitted endnote

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Time-resolved picosecond absorption spectroscopy of the layered compound gallium selenide

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