Abstract
By solid-phase synthesis, macrocrystalline Cu2 − δZn2 − xSnxS4 − ySey monograin powders have been prepared, the chemical composition of which was shown by XRD and Raman spectroscopy to be different in powder fractions of different sizes formed during the synthesis. The influence of synthesis conditions on the decay kinetics of photogenerated charge carriers in different fractions has been studied using the frequency–time-resolved microwave photoconductivity method. The characteristic photoresponse half-life, τ1/2, increased with increasing grain size. The smallest values of the lifetime were observed for the fraction with sizes of 50–70 μm (τ1/2 <5 ns), and the largest values were for the fraction with a grain size of 70–90 μm (τ1/2 ~ 12 ns).
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Funding
The study was carried out using a USF “Unique scientific facility for measuring the photogenerated carrier lifetimes by the microwave photoconductivity method in the frequency range of 36 GHz” and instrumentation of the Shared Use Center at the Institute of Problems of Chemical Physics, Russian Academy of Sciences, and supported by the Ministry of Education and Science of the Russian Federation, contract No. 14.613.21.0065 (unique project identifier RFMEFI61317X0065).
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Gapanovich, M.V., Varseev, D.N., Rabenok, E.V. et al. Influence of Synthesis Conditions on the Lifetime of Excess Charge Carriers in Monograin Powders with Kesterite Structure. High Energy Chem 53, 429–434 (2019). https://doi.org/10.1134/S0018143919060079
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DOI: https://doi.org/10.1134/S0018143919060079