The dependence of optical parameters on composition in the GexAsxSe1-2x glassy system
The optical properties of amorphous GexAsxSe2-x (x = 0.050.30) 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 , optical band gap Eg, and...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
D.Ghitu Institute of Electronic Engineering and Nanotechnologies
2011
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/9fd40e8f0401434e929264d4e16c99bb |
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| Sumario: | The optical properties of amorphous GexAsxSe2-x (x = 0.050.30) 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 , optical band gap Eg, and the
values of the refractive index n. The dependences of , 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 is the dispersion parameter (0 |
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