Funct. Mater. 2014; 21 (3): 313-317.
Influence of impurities on the absorption spectrum of thin Cs4PbI6 films
[1] V.Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
[2] Kharkiv National University of Radioelectronics, 14 Lenin Ave., 61166 Kharkiv, Ukraine
The absorption spectrum of the solid solutions,i (Cs1-xMx)4PbI6 (M = Rb,K) 0≤x≤1 is studied in the spectral range 2-6 eV at T = 90 K. The formation of solid solutions (Cs1-xRbx)4PbI6 in all range of concentrations, but (Cs1-xKx)4PbI6 in the range 0≤x≤0.9 is established, the compound K4PbI6 is unstable. Linear concentration of long-wavelength exciton band parameters in the (Cs1-xMx)4PbI6 indicates the localization of excitons in PbI64- structural elements of the compounds crystal lattice.
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