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Funct. Mater. 2019; 26 (2): 295-301.

doi:https://doi.org/10.15407/fm26.02.295

Exciton absorption spectra of RbPb2Cl5 and Rb6Pb5Cl16 thin films

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

1Kharkiv National University of Radio Electronics, 14 Nauky Ave., 61166 Kharkiv, Ukraine
2V.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine

Abstract: 

The absorption spectra of thin RbPb2Cl5 and Rb6Pb5Cl16 films were studied in the spectral range 2-6 eV and the temperature interval 90-500 K. A correlation was established between the absorption spectra and the crystal structure of the compounds. Excitons in both compounds are localized in a sublattice containing Pb2+ ions, and refer to excitons of the intermediate bond. An analysis of the temperature dependence of the half-width of exciton bands establishes a two-dimensional (2D) nature of the excitons in RbPb2Cl5 and three-dimensional (3D) in Rb6Pb5Cl16.

Keywords: 
Thin RbPb<sub>2</sub>Cl<sub>5</sub> and Rb<sub>6</sub>Pb<sub>5</sub>Cl<sub>16</sub> films, absorption spectra, crystal structure, exciton.
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