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Ultima descărcare din IBN: 2020-10-18 16:12 |
SM ISO690:2012 BENEA, Vasile, IOVU, Maria, COJOCARU, Ion, YOVU, M., KOLOMEYKO, Eduard, TĂZLĂVAN, Victor. The dependence of optical parameters on composition in the GexAsxSe1-2x glassy system. In: Moldavian Journal of the Physical Sciences, 2011, nr. 1(10), pp. 59-64. ISSN 1810-648X. |
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Moldavian Journal of the Physical Sciences | ||||||
Numărul 1(10) / 2011 / ISSN 1810-648X /ISSNe 2537-6365 | ||||||
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Pag. 59-64 | ||||||
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The optical properties of amorphous GexAsxSe2-x (x = 0.05-0.30) thin films prepared by thermal evaporation on glass substrates held at Tsubstr = 100 oC are reported. The transmission spectra was used for the 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 GexAsxSe1-2x glassy system were determined. It was established that the optical band gap Eg decreases, while the refractive index n increases with increasing 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 behavior T(t)/T(0) = A0 Aexp[-(t-t0)/τ] (1-) , 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). |
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