·         Temperature studies of absorption edge for Cu_0.1As_2.1S_3.1 thin films deposited using the thermal evaporation technique have shown the Urbach behavior of absorption edge defined by the strong electron-phonon interaction.

·         Compositional dependences of optical parameters in Cu-As-S thin films have demonstrated decrease of the energy pseudogap and increase in the Urbach energy with the copper content increase.

·         Influence of disordering processes on optical properties of Cu-As-S thin films is mainly defined by the influence of compositional disordering caused by the increase of copper content.

Semiconductor Physics, Quantum Electronics & Optoelectronics, 21 (2), P. 167-172 (2018).
DOI: https://doi.org/10.15407/spqeo21.02.167

Deposition and optical absorption studies of Cu–As–S thin films
I.P. Studenyak¹, Z.R. Molnar¹, I.I. Makauz¹, M.M. Pop¹, L. DarГіci², S. KГ¶kГ©nyesi², I. Szabo², A. Csik³

¹Faculty of Physics, Uzhhorod National University, 3, Narodna Sq., 88000 Uzhhorod, Ukraine, E-mail:studenyak@dr.com
^{2Faculty of Science and Technology, University of Debrecen, 18/a Bem Sq., 4026 Debrecen, Hungary
3ATOMKI, 18/c Bem Sq., 4026 Debrecen, Hungary}

^{Abstract. Cu–As–S thin films were deposited using the thermal evaporation technique. Optical transmission spectra of Cu 0.1 As 2.1 S 3.1 thin films were measured within the temperature range 77...300 K. Temperature behaviour of absorption edge inherent to Cu 0.1 As 2.1 S 3.1 thin films was studied. Temperature and compositional dependences of optical parameters in Cu–As–S thin films have been analyzed. It has been revealed that the energy pseudogap decrease and Urbach energy increase with the copper content increase take place in Cu–As–S thin films. The influence of or}

^{Keywords: thin film, thermal evaporation, optical absorption, energy pseudogap, Urbach energy.}

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