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Ujoatuonu, A. I.
Department of Physics, Michael Okpara University of Agriculture, Umudike, Nigeria
Efurumibe, E. L.
Department of Physics, Michael Okpara University of Agriculture, Umudike, Nigeria
Asiegbu, A. D.
Department of Physics, Michael Okpara University of Agriculture, Umudike, Nigeria
ABSTRACT
This paper optically
characterized nanocrystalline titanium
dioxide (TiO2 ) using natural dyes obtained from dacryodes edulis,
mimosa pudica, delonyx regia and xanthosoma saggittifolium leaves to function as dye sensitizers
in dye-sensitized solar cell (DSSC). Solvent extraction method was employed, UV-VIS spectrophotometer was
used to obtain the optical absorbance spectra of the sensitized films while
Tauc model was employed to determine the optical band gaps. From UV-Vis
absorption spectra, nc-TiO2 sensitized
with these natural dyes have absorbance at wavelength 200-720nm but low
transmittance and reflectance in the visible region. This indicated that the
dyes absorb visible light, which improves the optical properties of TiO2 when
sensitized with these natural dyes and have been found to be suitable for the
use as sensitizers in solar cells. Also, their optical band gaps were obtained
using Tauc relation, result showed approximate value of 1.30x10-9eV
Keywords: DSSC, Titanium dioxide, efficient sensitizers, optical band gap.
https://doi.org/10.33922/j.ujet_v9i1_1
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View: 95 | Download: 21
Published
Tuesday, June 27, 2023
Issue
Vol. 9 No. 1, June 2023
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
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