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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D.Ghitu Institute of Electronic Engineering and Nanotechnologies
2011
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oai:doaj.org-article:9fd40e8f0401434e929264d4e16c99bb2021-11-21T12:02:53ZThe dependence of optical parameters on composition in the GexAsxSe1-2x glassy system2537-63651810-648Xhttps://doaj.org/article/9fd40e8f0401434e929264d4e16c99bb2011-02-01T00:00:00Zhttps://mjps.nanotech.md/archive/2011/article/4306https://doaj.org/toc/1810-648Xhttps://doaj.org/toc/2537-6365The 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 (0Benea, VasileIovu, MariaCojocaru, IonIovu, MihailColomeico, EduardTăzlăvan, VictorD.Ghitu Institute of Electronic Engineering and NanotechnologiesarticlePhysicsQC1-999ElectronicsTK7800-8360ENMoldavian Journal of the Physical Sciences, Vol 10, Iss 1, Pp 59-64 (2011) |
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DOAJ |
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DOAJ |
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EN |
| topic |
Physics QC1-999 Electronics TK7800-8360 |
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Physics QC1-999 Electronics TK7800-8360 Benea, Vasile Iovu, Maria Cojocaru, Ion Iovu, Mihail Colomeico, Eduard Tăzlăvan, Victor The dependence of optical parameters on composition in the GexAsxSe1-2x glassy system |
| description |
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 |
| format |
article |
| author |
Benea, Vasile Iovu, Maria Cojocaru, Ion Iovu, Mihail Colomeico, Eduard Tăzlăvan, Victor |
| author_facet |
Benea, Vasile Iovu, Maria Cojocaru, Ion Iovu, Mihail Colomeico, Eduard Tăzlăvan, Victor |
| author_sort |
Benea, Vasile |
| title |
The dependence of optical parameters on composition in the GexAsxSe1-2x glassy system |
| title_short |
The dependence of optical parameters on composition in the GexAsxSe1-2x glassy system |
| title_full |
The dependence of optical parameters on composition in the GexAsxSe1-2x glassy system |
| title_fullStr |
The dependence of optical parameters on composition in the GexAsxSe1-2x glassy system |
| title_full_unstemmed |
The dependence of optical parameters on composition in the GexAsxSe1-2x glassy system |
| title_sort |
dependence of optical parameters on composition in the gexasxse1-2x glassy system |
| publisher |
D.Ghitu Institute of Electronic Engineering and Nanotechnologies |
| publishDate |
2011 |
| url |
https://doaj.org/article/9fd40e8f0401434e929264d4e16c99bb |
| work_keys_str_mv |
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