The exponential increase of the absorption coefficient near the absorption edge is usually explained by existence of the density-of-states tails. Among the quoted theoretical models which are widely used to explain the manifestations of the Urbach rule in semiconductors, are the Sumi–Toyozava and the Dow–Redfield models and ab initio (from begining) theory. Our barrier-cluster-heating model assumes the different creating mechanism of exponential tails. The energy by optical transition is provided to electrons except from photons also from vibration of microregion. It deals about the replenishment of absented photons energy, which is smaller as gap width. Absented energy needed for the transition by light absorption is acumulated in certain microregions of material in the form of vibrational energy. At absorption sufficiently big package of accumulated energy can be used. Energy of emptied microarea is filled by phonons from surrounding of microarea (as result of temperature status of surrounding), resp. phonons of optical background wich are created in given microarea at non radiative recombination of carriers. In this work simplified process at derivating of Urbach rule is listed.
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7 July 2016
THERMOPHYSICS 2016: 21st International Meeting
12–14 October 2016
Terchova, Slovakia
Research Article|
July 07 2016
Order and disorder and their influences on optical absorption of glasses in the gap region Available to Purchase
Ivan Baník;
Ivan Baník
a)
1Faculty of Civil Engineering,
Slovak University of Technology
, Radlinského 11, 81005 Bratislava, Slovakia
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Marian Kubliha;
Marian Kubliha
b)
1Faculty of Civil Engineering,
Slovak University of Technology
, Radlinského 11, 81005 Bratislava, Slovakia
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Vladimír Labaš;
Vladimír Labaš
c)
2Faculty of Materials and Technology,
Slovak University of Technology
, J.Bottu 25, 91724 Trnava, Slovakia
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Jozefa Lukovičová;
Jozefa Lukovičová
d)
1Faculty of Civil Engineering,
Slovak University of Technology
, Radlinského 11, 81005 Bratislava, Slovakia
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Gabriela Pavlendová;
Gabriela Pavlendová
e)
1Faculty of Civil Engineering,
Slovak University of Technology
, Radlinského 11, 81005 Bratislava, Slovakia
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Ivan Baník
1,a)
Marian Kubliha
1,b)
Vladimír Labaš
2,c)
Jozefa Lukovičová
1,d)
Gabriela Pavlendová
1,e)
Peter Šín
1,f)
1Faculty of Civil Engineering,
Slovak University of Technology
, Radlinského 11, 81005 Bratislava, Slovakia
2Faculty of Materials and Technology,
Slovak University of Technology
, J.Bottu 25, 91724 Trnava, Slovakia
AIP Conf. Proc. 1752, 040001 (2016)
Citation
Ivan Baník, Marian Kubliha, Vladimír Labaš, Jozefa Lukovičová, Gabriela Pavlendová, Peter Šín; Order and disorder and their influences on optical absorption of glasses in the gap region. AIP Conf. Proc. 7 July 2016; 1752 (1): 040001. https://doi.org/10.1063/1.4955232
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