Electrical and optical characterization of CdxZn1-xs thin films deposited by chemical bath deposition in alkaline conditions

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dc.contributor.authorJohn, Okumu
dc.contributor.authorNjoroge, Walter N.
dc.contributor.authorMosiori, Cliff Orori
dc.date.accessioned2015-02-23T12:40:55Z
dc.date.available2015-02-23T12:40:55Z
dc.date.issued2014-04
dc.descriptionJournal articleen_US
dc.description.abstractIn this work ternary CdZnS thin films were prepared by chemical bath deposition by doping CdS with different concentrations of Zn ions. The chemical bath comprised of cadmium nitrate [Cd(NO3)2], as a source of Cd2+, zinc nitrate [ZnNO3)2]as source of Zn2+, thiourea [(NH2)2CS] as a source of sulphide ions [S2-]in the presence of ammonia [NH3] as a complexing agent. The competition mechanisms of Cd2+ and Zn+2 with the complexing agent [NH3] to form complex ions usually plays a critical role in the formation of CdxZn1-xS thin films and therefore the influence of Zn2+ on the formation mechanisms of the CdxZn1-xS was discussed. Optical and electrical properties of these samples were analysed. Parameters like band gap (Eg), extinction coefficient (k), absorption coefficient (α), dielectric constant (ε), refractive index, (n)and resistivity (ρ) were calculated using the data obtained from different measurements. Optical band gap tunability of the deposited films for various Zn2+ concentrations was successfully demonstrated by UV-VIS-NIR spectroscopy. Transmittance inCdxZn1-xSwas found to be above 80%, optical band gap of 2.47-2.72 eV, refractive index of 2.58 – 2.39, and sheet resistivity of 1.09– 1.36 × 102 -cm for x = 1.0 – 0.6.en_US
dc.description.sponsorshipUniversity of Nairobi department of Material Science [Chiromo Campus] for kindly providing the UV-VIS-NIR spectrophotometer 3700 for the spectral analysis of the thin filmsen_US
dc.identifier.citationDirect Research Journal of Chemistry and Material Science (DRCMS) Vol.2 (1), pp. 13-20, April 2014 ISSN 2354-4163en_US
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/12273
dc.language.isoenen_US
dc.publisherDirect Research Journals Publisheren_US
dc.subjecttransmittanceen_US
dc.subjectrefractive indexen_US
dc.subjectelectrical and optical propertiesen_US
dc.subjectChemical bath depositionen_US
dc.subjectCdxZn1-xSen_US
dc.subjectZnSen_US
dc.subjectCdSen_US
dc.titleElectrical and optical characterization of CdxZn1-xs thin films deposited by chemical bath deposition in alkaline conditionsen_US
dc.typeArticleen_US
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