We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Features of the Dynamics of the Photoluminescence Spectrum of the Cu<sub>3</sub>In<sub>5</sub>S<sub>9</sub> Crystal with a Change in the Intensity of Laser Excitation.
- Authors
Guseinov, A. G.; Mamedov, R. M.; Bairamova, A. I.; Javadova, M. M.
- Abstract
Photoluminescence spectra have been studied on the naturally formed surface of a layered Cu3-In5S9 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 Cu3I-n5S9 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 Cu3In5S9 crystal in the range of 110–350 K, the activation energies of two donor levels were determined: 0.28 and 0.76 eV.
- Subjects
PHOTOLUMINESCENCE; LUMINESCENCE quenching; CRYSTALS; LASER beams; ELECTRIC conductivity; EXCITON theory
- Publication
Optics & Spectroscopy, 2022, Vol 130, Issue 5, p350
- ISSN
0030-400X
- Publication type
Article
- DOI
10.1134/S0030400X22060030