Kovalenko, E. N.Kovalenko, V. V.Yunakova, O. N.Yunakov, N. N.2018-05-292018-05-292016Kovalenko E. N. Exciton absorption spectra of KPb2Br5 thin films / V. V. Kovalenko, E. N. Kovalenko, O. N. Yunakova, N. N. Yunakov // Functional Materials. – 2016. – V, 23, №4. – p. 570-575.1027-5495http://openarchive.nure.ua/handle/document/5556The absorption spectrum of KPb2Br5 thin film of tetragonal (I) and monoclinic (II) structures were investigated in the spectral region of 2-6 eV and the temperature range 90-440K. It was found that KPb2Br5 (I) of the tetragonal structure irreversibly becomes in KPb2Br5(II) of the monoclinic structure when T = 293 K. It is found that low-frequency exciton excitations of KPb2Br5 (I, II) are localized in the sublattice, which contains ions Pb2+, and its are two-dimensional nature.enthin filmsabsorption spectraexitonsphase transitionArticle