The exciton absorption spectrum of thin films of ternary compounds in the AgBr

The exciton absorption spectrum of thin films of ternary compounds in the AgBr–PbBr₂ system

E.N. Kovalenko

Kharkov National University of Radio Electronics ave. Nauky, 14, Kharkov, 61166, Ukraine
E-mail: olena.kovalenko@nure.ua

O.N. Yunakova, and N.N. Yunakov

V.N. Karazin Kharkiv National University, 4 Svobody Sq., Kharkiv 61022, Ukraine
E-mail: o.n.yunakova@gmail.com
nnyunakov@ukr.net

Received January 21. 2018, revised February 16, 2018

Exciton absorption spectra in the photon energy range 2–6 eV were studied for thin films of complex compounds AgPbBr₃, AgPb₂Br₅ and AgPb₃Br₇. It is established that the compounds belong to the direct-band dielectrics, low-frequency excitons are localized in the structural layers (PbBr8)^6– of the crystal lattice and are quasi-two-dimensional in nature.

PACS: 78.20.–e Optical properties of bulk materials and thin films;
PACS: 78.40.–q Absorption and reflection spectra: visible and ultraviolet.

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The exciton absorption spectrum of thin films of ternary compounds in the AgBr–PbBr2 system

The exciton absorption spectrum of thin films of ternary compounds in the AgBr–PbBr₂ system