Please use this identifier to cite or link to this item: http://ir.juit.ac.in:8080/jspui/jspui/handle/123456789/5126
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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