Naslov
Fundamental optical absorption edge and exciton-phonon interaction in Cu6PS5Br superionic ferroelastic

Autori
Studenyak, Igor P. ; Kranjčec, Mladen ; Kovacs, G.S. ; Panko, V.V. ; Desnica, Dunja Ida ; Čelustka, B. ; Borets, O.M. ; Voroshilov, Y.V.

Izvornik
Materials science & engineering. B, Solid-state materials for advanced technology (0921-5107) 52 (1998); 202-207

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ferroelastics; optical absorption; excitonsferroelastics; optical absorption; excitons
(ferroelastics; optical absorption; excitons)

Sažetak
The absorption edge of monocrystalline Cu/sub 6/PS/sub 5/Br was studied in the 4.2-505 K temperature range. At low temperature (T<180 K), Wannier-Mott s-excitons were detected at the absorption edge as well as in the photoluminescence spectra and, their basic parameters at 77 K were estimated. The mechanisms of exciton-photon interaction resulting in exponential absorption edge and Urbach's tail at temperatures T>200 K were analyzed and interpreted in the framework of the Dow-Redfield theory. Two types of structural disorder affecting the optical absorption tail were studied.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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