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Proceedings Paper

Optical properties of GexAsxSe1-2x glasses
Author(s): Vasile Benea; Mihail Iovu; Eduard Colomeico; Maria Iovu; Ion Cojocaru; Oleh Shpotyuk
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Paper Abstract

The optical properties of amorphous GexAsxSe2-x (x=0.05÷0.30) thin films prepared by thermal evaporation on the glass substrates held at Tsubstr=100°C are reported. The transmission spectra was used for calculation of the absorption coefficient α, optical band gap Eg, and the values of the refractive index n. The dependences of α, Eg, and n on the film composition in the GexAsxSe2-x glassy system were determined. It was established that the optical band gap Eg decreases, while the refractive index n increases with the increasing of the concentration of Ge and As in the GexAsxSe2-x glassy system. The time dependence of the transmission T(t) during the light exposure for the above band gap illumination (photodarkening) is described by a strength exponential behaviour T(t)/T(0) = A0+Aexp[-(t-t0)/τ](1-β), where t is the exposure time, τ is the apparent time constant, A characterizes the exponent amplitude, t0 and A0 are the initial coordinates, and β is the dispersion parameter (0<β<1).

Paper Details

Date Published: 3 December 2010
PDF: 6 pages
Proc. SPIE 7821, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies V, 782109 (3 December 2010); doi: 10.1117/12.882071
Show Author Affiliations
Vasile Benea, Institute of Applied Physics (Moldova)
Mihail Iovu, Institute of Applied Physics (Moldova)
Eduard Colomeico, Institute of Applied Physics (Moldova)
Maria Iovu, Institute of Applied Physics (Moldova)
Ion Cojocaru, Institute of Applied Physics (Moldova)
Oleh Shpotyuk, Lviv Scientific Research Co. (Ukraine)

Published in SPIE Proceedings Vol. 7821:
Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies V
Paul Schiopu; George Caruntu, Editor(s)

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