Abstract
The stimulated emission of Cu(In,Ga)Se2 alloy thin films formed by magnetron-assisted sputtering onto a sodium-fluoride layer deposited onto a molybdenum layer on a glass substrate is observed. The structural and optical parameters of the films are determined by scanning electron microscopy, local X-ray spectral microanalysis, X-ray structural analysis, and low-temperature luminescence (T = 10 K) measurements in the range of excitation levels of 1.6–75 kW cm–2 provided by nanosecond nitrogen-laser pulses. The stimulated emission threshold corresponds to ~25 kW cm–2. Comparative analysis of the emission of Cu(In,Ga)Se2 thin films suggests that the introduction of sodium results in significant improvement of the structural quality, specifically, in a decrease in the density of energy states in the band tails and in a decrease in the concentration of nonradiative-recombination centers.
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ACKNOWLEDGMENTS
The study was supported by government orders, programs of scientific research in the Republic of Belarus “Photonics, Optoelectronics, and Microelectronics 2.1.01” and “Nanomaterials and Nanotechnologies 2.56”, and by the Russian Science Foundation, project no. 17-12-01500.
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Svitsiankou, I.E., Pavlovskii, V.N., Lutsenko, E.V. et al. Luminescence and Stimulated Emission of Polycrystalline Cu(In,Ga)Se2 Films Deposited by Magnetron-Assisted Sputtering. Semiconductors 52, 1238–1243 (2018). https://doi.org/10.1134/S1063782618100196
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DOI: https://doi.org/10.1134/S1063782618100196