Funct. Mater. 2024; 31 (1): 13-17.

doi:https://doi.org/10.15407/fm31.01.13

Exciton absorption spectrum of thin films of (CsxK1-x)2CuCl3 solid solutions

E.N. Kovalenko1, O.N. Yunakova2, N.N. Yunakov2

1Kharkov National University of Radio Electronics,14, Nauki Ave., Kharkiv 61166, Ukraine,
2Kharkiv National University, 4, Svobody Sq., Kharkiv 61022, Ukraine

Abstract: 

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.

Keywords: 
thin films, absorption spectra, excitons.

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