Funct. Mater. 2024; 31 (1): 13-17.
Exciton absorption spectrum of thin films of (CsxK1-x)2CuCl3 solid solutions
1Kharkov National University of Radio Electronics,14, Nauki Ave., Kharkiv 61166, Ukraine,
2Kharkiv National University, 4, Svobody Sq., Kharkiv 61022, Ukraine
The absorption spectra of thin films of (CsxK1-x)2CuCl3 0≤х≤1 (T=90K) solid solutions in the spectral range 2–6 eV were studied. According to the analysis of the spectra, the formation of two types of compounds was observed and studied: 1) compounds at x=0 and in the range of 0.4≤х≤1 which are isostructural to Cs2CuCl3 and K2CuCl3; 2) compounds at x=0.2 which are isostructural to CsCu2Cl3. The excitonic spectra of (CsxK1-x)2CuCl3 0≤х≤1compounds are caused by transitions in the Cu+ ion. The linear concentration dependences of the spectral position of exciton bands in both types of compounds confirm the localization of excitons in sublattices containing Cu+ ions.
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