Exciton absorption spectra of thin films of RbCu2Cl3 and Rb2Cu3Cl5 ternary compounds

Abstract

The absorption spectra of RbCu2Cl3 and Rb2Cu3Cl5 thin films were studied in the 2–6 eV spectral and 90–450 K temperature ranges. The localization of excitons in 3–4CuCl structural elements of crystal lattice of compounds, three-dimensional nature of excitons in RbCu2Cl3 and two-dimensional nature of excitons in Rb2Cu3Cl5 were es-tablished. The exciton spectra of RbCu2Cl3 and Rb2Cu3Cl5 thin films were interpreted based on the transitions in the Cu+ ion.