Abstract
The results of studies of the optical properties of ensembles of colloidal CdS quantum dots passivated by thioglycolic acid are reported. The average dimensions of the quantum dots lie in the range from 1.7 to 5.8 nm. By X-ray diffraction studies and Raman spectroscopy, it is established that quantum dots crystallize with the formation of a cubic crystal lattice. The systematic features of the quantum-confinement effect in the optical absorption and luminescence spectra, as well as in the luminescence excitation spectra, are established. The features manifest themselves as a blue shift of the corresponding bands with decreasing quantum-dot dimensions. From analysis of the nanosecond luminescence kinetics, it is concluded that experimentally observed radiative recombination proceeds by the donor–acceptor mechanism.
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ACKNOWLEDGMENTS
The study was supported by the Russian Foundation for Basic Research, project Bel_mol_a no. 17-52-04090, and Belarusian Republican Foundation for Fundamental Research, project no. F17RM-077.
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Kondratenko, T.S., Smirnov, M.S., Ovchinnikov, O.V. et al. Size-Dependent Optical Properties of Colloidal CdS Quantum Dots Passivated by Thioglycolic Acid. Semiconductors 52, 1137–1144 (2018). https://doi.org/10.1134/S1063782618090087
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DOI: https://doi.org/10.1134/S1063782618090087