Archive: 2011 - Moldavian Journal of the Physical Sciences

05 Feb 2011

2011
V. 10
1
(p.59 - 64)

The dependence of optical parameters on composition in the GexAsxSe1-2x glassy system

Authors:

Benea, Vasile; Iovu, Maria; Cojocaru, Ion; Iovu, Mihail; Colomeico, Eduard; Tăzlăvan, Victor

Summary:

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 , 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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<meta name="citation_title" content="The dependence of optical parameters on composition in the GexAsxSe1-2x  glassy system">
<meta name="citation_author" content="Benea, Vasile">
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oC  are  reported. The  transmission 
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BibTeX

@article{ibn_4306,
author = {Benea, V.G. and Iovu, M.A. and Cojocaru, I.A. and Iovu, M.S. and Colomeico, E.P. and Tăzlăvan, V.E.},
title = {The dependence of optical parameters on composition in the GexAsxSe1-2x  glassy system},
journal = {Moldavian Journal of the Physical Sciences},
year = {2011},
volume = {10 (1)},
pages = {59-64},
month = {Feb},
abstract = {(EN) 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 , 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<<1). 
 },
url = {https://ibn.idsi.md/vizualizare_articol/4306},
}

DataCite

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<title xml:lang='en'>The dependence of optical parameters on composition in the GexAsxSe1-2x  glassy system</title>
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<description xml:lang='en' descriptionType='Abstract'>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 , 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<<1). 
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<dc:date>2011-02-05</dc:date>
<dc:description xml:lang='en'>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 , 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<<1). 
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<dc:source>Moldavian Journal of the Physical Sciences 10 (1) 59-64</dc:source>
<dc:title>The dependence of optical parameters on composition in the GexAsxSe1-2x  glassy system</dc:title>
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“ ... ”

SM ISO690:2012

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. In: Moldavian Journal of the Physical Sciences. 2011, nr. 1(10), pp. 59-64. ISSN 1810-648X.