Fizika Nizkikh Temperatur: Volume 44, Number 8 (August 2018), p. 1095-1100    ( to contents , go back )

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

Abstract

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.

Key words: thin films, absorption spectra, excitons.

Published online: June 27, 2018

Download 358616 byte View Contents