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Current issue   Ukr. J. Phys. 2017, Vol. 62, N 2, p.159-165
https://doi.org/10.15407/ujpe62.02.0159    Paper

Veleschuk V.P., Vlasenko O.I., Vlasenko Z.K., Gnatyuk V.A., Levytskyi S.N.

V.E. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine
(41, Nauky Ave., Kyiv 03028, Ukraine; e-mail: vvvit@ukr.net)

Dependence of the CdTe Melting Threshold on the Pulse Duration and Wavelength of Laser Radiation and the Parameters of Non-Equilibrium Charge Carriers

Section: Solid Matter
Original Author's Text:  Ukrainian

Abstract: The dependences of the melting threshold of CdTe under the pulsed laser irradiation on the radiation wavelength and the laser pulse duration p are calculated with regard for the nonequilibrium character of charge carriers. Three components of the energy released at the thermalization of excited carriers under the nanosecond laser irradiation of CdTe in the fundamental absorption region are considered: the component that dominates immediately after the excitation, and the components released at the nonradiative bulk and nonradiative surface recombinations. Together, they determine the depth of heat penetration into the crystal and, therefore, its melting threshold. It is shown that the CdTe melting threshold grows from 2.6 to 4.75 MW/cm2 , when changes from 300 to 800 nm at p = 20 ns. The changes in the nonequilibrium charge carrier parameters (the surface recombination rate, lifetime, and diffusion depth) are found to vary the CdTe melting threshold by at least 30%.

Key words:  cadmium telluride, pulsed laser irradiation.