Optical Properties and Analysis of OJL Model’s Electronic inter-band Transition Parameters of TiO2 Films

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dc.contributor.authorMusila, Nicholas
dc.contributor.authorMunji, Mathew
dc.contributor.authorSimiyu, Justus
dc.contributor.authorMasika, Eric
dc.contributor.authorNyenge, Raphael
dc.date.accessioned2023-07-05T09:21:32Z
dc.date.available2023-07-05T09:21:32Z
dc.date.issued2018
dc.descriptionarticleen_US
dc.description.abstractTitanium dioxide is a wide band gap semiconductor responsible for the bright white appearance in most substances. This material has many unique properties due to its extra-ordinary chemical stability. TiO2 has a conduction band that closely matches the excited energy level of organic dyes hence it is used in fabrication of photo-anode electrode of dye sensitized solar cell. However, the optical properties and the density of states of TiO2 thin films determine the performance of dye sensitized solar cell fabricated from TiO2 photo-anode electrode. For this reason, the purpose of this study was to investigate the optical properties and the OJL electronic inter-band transition analysis of TiO2 nanoparticle thin films. Under the OJL model, the expressions of density of states were specified for the optical transition from the valence band to the conduction band. The TiO2 nanoparticles were prepared using sol-gel and hydrothermal methods and deposited on a conductive glass substrate by screen printing and spray pyrolysis techniques. SEM analysis revealed that TiO2 nanoparticles were spongy and had unevenly sphere-shaped profile while TiO2 nanotubes had a skein-like morphology with abundant number of nanotubes intertwined together. This study showed that TiO2 thin films have both direct and indirect band-gaps. The OJL Gap energy (E0) values were observed to be between 30273.2356 and 31072.0000 wavenumbers which translated to band-gap energies between 3.744 and 3.843 eV. From these findings showed that TiO2 films prepared could be used in the fabrication of high performing dye-sensitized solar cell.en_US
dc.identifier.citationMusila, N., Munji, M., Simiyu, J., Masika, E., & Nyenge, R. (2018). Optical Properties and Analysis of OJL Model’s Electronic inter-band Transition Parameters of TiO2 Films. Traektoriâ Nauki= Path of Science, 4(7), 3001-3012.en_US
dc.identifier.otherDOI: 10.22178/pos.36-5
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/26081
dc.language.isoenen_US
dc.subjectTiO2 nanotube thin filmsen_US
dc.subjectdensity of statesen_US
dc.subjectOJL model parametersen_US
dc.subjectOJL Gap energyen_US
dc.subjectspray pyrolysisen_US
dc.titleOptical Properties and Analysis of OJL Model’s Electronic inter-band Transition Parameters of TiO2 Filmsen_US
dc.typeArticleen_US
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