Features of the Dynamics of the Photoluminescence Spectrum of the Cu3In5S9 Crystal with a Change in the Intensity of Laser Excitation

Photoluminescence spectra have been studied on the naturally formed surface of a layered Cu 3 -In 5 S 9 crystal when excited by nanosecond laser radiation. At relatively low levels of optical excitation intensity, luminescence quenching was detected near the photon energy of 1.636 eV, in a narrow en...

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Bibliographic Details
Published in:Optics and spectroscopy 2022-05, Vol.130 (5), p.350-354
Main Authors: Guseinov, A. G., Mamedov, R. M., Bairamova, A. I., Javadova, M. M.
Format: Article
Language:English
Subjects:
Crystals
Electrical resistivity
Energy bands
Excitation
Excitation spectra
Excitons
Lasers
Luminescence quenching
Optical Devices
Optics
Photoelectric effect
Photoluminescence
Photonics
Physics
Physics and Astronomy
Radiation
Temperature dependence
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Summary:Photoluminescence spectra have been studied on the naturally formed surface of a layered Cu 3 -In 5 S 9 crystal when excited by nanosecond laser radiation. At relatively low levels of optical excitation intensity, luminescence quenching was detected near the photon energy of 1.636 eV, in a narrow energy band—118 MeV. This phenomenon is explained by the formation of bound excitons of a triplet nature and their dissociation with the emission of phonons. It is shown that with an increase in the intensity of optical excitation of the crystal, the impurity band of radiation in the crystal disappears. The spectrum of the Cu 3 I-n 5 S 9 photocurrent at 295 K is formed by peaks at energies of 1.53 and 1.81 eV. The lifetime of nonequilibrium electrons through fast centers is ~20 ns. From the temperature dependence of the electrical conductivity of the Cu 3 In 5 S 9 crystal in the range of 110–350 K, the activation energies of two donor levels were determined: 0.28 and 0.76 eV.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X22060030