Semiconductor Physics, Quantum Electronics & Optoelectronics. 2012. V. 15, N 3. P. 227-231.
DOI: https://doi.org/10.15407/spqeo15.03.227

Influence of cation substitution on electrical conductivity and optical absorption edge in Cu7(Ge1–xSix)S5I mixed crystals
I.P. Studenyak1, M. Kranjčec2, V.V. Bilanchuk1, A. Dziaugys3, J. Banys3, A.F. Orliukas3

1Uzhhorod National University, Physics Faculty,46, Pidhirna str. 88000 Uzhhorod, Ukraine
2University of Zagreb, Geotechnical Faculty, Hallerova Aleja 7, 42000 Varaždin, Croatia
3Vilnius University, Physics Faculty, Saulėtekio al. 9, LT-10222 Vilnius, Lithuania, e-mail: studenyak@dr.com

Abstract. Electrical conductivity of Cu7(Ge1–xSix)S5I mixed crystals was measured in the frequency range 1.0·106–1.2·109 Hz and in the temperature interval 100–300 K. The frequency and temperature behaviour of the electrical conductivity were analyzed. The optical absorption edge of mixed crystals within the temperature range 77–300 K was studied. The compositional dependences of the electrical conductivity, activation energy, optical pseudogap and Urbach energy were obtained. The influence of Ge→Si cation substitution on the optical absorption processes in the Cu7(Ge1–xSix)S5I mixed crystals is investigated.

Keywords: mixed crystals, electrical conductivity, activation energy, absorption edge, Urbach rule.

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