ABSTRACT
Living plants have been found to produce bioelectricity by
turning sunlight into electricity based on the photosynthesis theory. This
technology has the potential to provide a continuous, clean energy supply
without relying on traditional means of generating electricity. In this study,
natural dyes was extracted from ubengba leaf (Canarium schweinfurthii), pumpkin
leaf (Telfairia occidentalis), and turmeric leave (Curcuma longa) respectively,
and were analyzed as a potential sensitizer for the development of dye
sensitized solar cell. The optical characteristics of the extracted dyes were
studied using UV-VIS spectrophotometer 1601 PC. The extracted dyes showed a
broad range of absorption within the visible region between 340nm to 550nm
wavelengths. Absorption peaks were found at 422nm wavelength for ubengba leaf,
37mm and 522nm wavelength for pumpkin leaf and 457nm wavelength for turmeric
leaf The natural dyes showed good transmittances between 470nm to 800nm, hence
complete visible spectrum is available for the dyes to absorb photon energy.
The absorption and extinction coefficients of the dyes showed a wide range of
absorption from 300nm to 550nm wavelength. Above 550nm wavelength, the absorption
and extinction coefficient is almost zero indicating that dye absorbs very
little light above 550nm wavelength. From tauc plot, the natural dye from
pumpkin leaf showed a higher bandgap of 3.13 eV, while that of ubengba and
turmeric showed bandgap of 2.48eV and 2.41eV.
ODILI, P (2021). Optical Characteristics And Bandgap Analysis Of Selected Natural Dyes For Dye Sensitized Solar Cell (Dssc) Application. Mouau.afribary.org: Retrieved Dec 23, 2024, from https://repository.mouau.edu.ng/work/view/optical-characteristics-and-bandgap-analysis-of-selected-natural-dyes-for-dye-sensitized-solar-cell-dssc-application-7-2
PASCAL, ODILI. "Optical Characteristics And Bandgap Analysis Of Selected Natural Dyes For Dye Sensitized Solar Cell (Dssc) Application" Mouau.afribary.org. Mouau.afribary.org, 29 Nov. 2021, https://repository.mouau.edu.ng/work/view/optical-characteristics-and-bandgap-analysis-of-selected-natural-dyes-for-dye-sensitized-solar-cell-dssc-application-7-2. Accessed 23 Dec. 2024.
PASCAL, ODILI. "Optical Characteristics And Bandgap Analysis Of Selected Natural Dyes For Dye Sensitized Solar Cell (Dssc) Application". Mouau.afribary.org, Mouau.afribary.org, 29 Nov. 2021. Web. 23 Dec. 2024. < https://repository.mouau.edu.ng/work/view/optical-characteristics-and-bandgap-analysis-of-selected-natural-dyes-for-dye-sensitized-solar-cell-dssc-application-7-2 >.
PASCAL, ODILI. "Optical Characteristics And Bandgap Analysis Of Selected Natural Dyes For Dye Sensitized Solar Cell (Dssc) Application" Mouau.afribary.org (2021). Accessed 23 Dec. 2024. https://repository.mouau.edu.ng/work/view/optical-characteristics-and-bandgap-analysis-of-selected-natural-dyes-for-dye-sensitized-solar-cell-dssc-application-7-2