Considerations about the determination of optical bandgap from diffuse reflectance spectroscopy using the tauc plot

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dc.authoridChahrour, Khaled M. N./0000-0002-8799-3468
dc.authoridJubu, Rex/0000-0002-5249-1273
dc.contributor.authorJubu, Peverga R.
dc.contributor.authorObaseki, O. S.
dc.contributor.authorAjayi, D. I.
dc.contributor.authorDanladi, E.
dc.contributor.authorChahrour, Khaled M.
dc.contributor.authorMuhammad, A.
dc.contributor.authorLandi Jr, S.
dc.date.accessioned2024-09-29T15:54:38Z
dc.date.available2024-09-29T15:54:38Z
dc.date.issued2024
dc.departmentKarabük Üniversitesien_US
dc.description.abstractThe optical diffuse reflectance data of a semiconductor material is usually converted into the Kubelka-Munk function before proceeding to process the conventional Tauc's plot from which optical bandgap energy can be determined. Firstly, it is conventional/ customary to convert the percentage reflectance (R-infinity(%)) data, which is obtained from UV-vis measurement into an equivalent reflectance (R-infinity) that range between 0 and 1 before processing the Tauc's plot. Secondly, the Kubelka-Munk function is usually multiplied by the incident photon energy, h nu, to produce an all-elements/ comprehensive Tauc's plot. Literature is scarce to convincingly demonstrate that a correct bandgap value can, alternatively be obtained from the Tauc's plot that is derived directly from the (R-infinity(%) data without having to convert to R-infinity. Also, publication is rarely available to demonstrate that a proper bandgap value can be determined without having to multiply the Kubelka-Munk function by the term h nu. The present investigation shows diminutive differences in the bandgap values estimated from the R-infinity(%)-based Tauc's plots and the equivalent R-infinity-based Tauc's plots. This suggests that either of the methods can be employed for a precise bandgap estimate. A comparison between the magnitudes of the bandgap energies determined from the comprehensive Tauc's plot and when the Kubelka-Munk function is not multiplied by h nu reveals insignificant differences in the estimated values. This suggests that either of the two methods can be employed to obtain a reliable bandgap for direct and indirect optical gap semiconductors.en_US
dc.description.sponsorshipUniversiti Sains Malaysia [FRGS/1/2020/STG05/USM/02/4]; Ministry of Higher Education Malaysia; Universiti Sains Malaysia (USM)en_US
dc.description.sponsorshipThe authors appreciate the Ministry of Higher Education Malaysia for the Fundamental Research Grant Scheme with Reference Code: (FRGS/1/2020/STG05/USM/02/4), and Universiti Sains Malaysia (USM) for the financial and technical support they provided for this work.en_US
dc.identifier.doi10.1007/s12596-024-01741-0
dc.identifier.issn0972-8821
dc.identifier.issn0974-6900
dc.identifier.scopus2-s2.0-85187293429en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.urihttps://doi.org/10.1007/s12596-024-01741-0
dc.identifier.urihttps://hdl.handle.net/20.500.14619/4197
dc.identifier.wosWOS:001171462400001en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherSpringer Indiaen_US
dc.relation.ispartofJournal of Optics-Indiaen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectTauc's ploten_US
dc.subjectBandgap energyen_US
dc.subjectKubelka-Munk functionen_US
dc.subjectUV-vis spectroscopyen_US
dc.subjectSemiconductorsen_US
dc.titleConsiderations about the determination of optical bandgap from diffuse reflectance spectroscopy using the tauc ploten_US
dc.typeArticleen_US

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