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Title: | An Optical study of Vacuume Vaporated Se85 xTe15Bix Chalcogenide Thin Films |
Authors: | Ambika Barman, P.B. |
Keywords: | Chalcogenide glasses Refractive index Cohesive energy Optical band gap |
Issue Date: | 2010 |
Publisher: | Jaypee University of Information Technology, Solan, H.P. |
Abstract: | Thin filmsofSe85 xTe15Bix (x ¼ 0, 1,2,3,4,5)glassyalloyspreparedbymeltquenchingtechnique,are depositedonglasssubstrateusingthermalevaporationtechniqueundervacuum.Theanalysisof transmission spectra,measuredatnormalincidence,inthespectralrange400–1500nmhelphelpsusin the opticalcharacterizationofthinfilmsunderstudy.Well-knownSwanepoel’smethodisemployedto determine therefractiveindex(n) andfilmthickness(d). Theincreasein n with increasingBicontent overtheentirespectralrangeisrelatedtotheincreasedpolarizabilityofthelargerBiatom(atomic radius 1.46 A˚ ) comparedwiththeSeatom(atomicradius1.16 A˚ ). Dispersionenergy(Ed), averageenergy gap (E0) andstaticrefractiveindex(n0) isarecalculatedusingWemple–DiDomenicomodel(WDD). The valueofabsorptioncoefficient(a) andhenceextinctioncoefficient(k) hashavebeendetermined from transmissionspectra.Opticalbandgap(Eg) isestimatedusingTauc’sextrapolationandisfoundto decrease from1.46to1.24eVwiththeBiaddition.Thisbehaviorofopticalbandgapisinterpretedin terms ofelectronegativitydifferenceoftheatomsinvolvedandcohesiveenergyofthesystem. |
Description: | Physica B 405(2010) 822–827 |
URI: | http://ir.juit.ac.in:8080/jspui//xmlui/handle/123456789/5126 |
Appears in Collections: | Journal Articles |
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An Optical study of Vacuume Vaporated Se85 xTe15Bix Chalcogenide Thin Films.pdf | 504.74 kB | Adobe PDF | View/Open |
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