The optical properties of anthocyanin-doped nanocrystalline-TiO2 and the photovoltaic efficiency on DSSC

This research work is an investigation of the optical characteristics of nanocrystalline titanium dioxide doped with anthocyanin local dye. Anthocyanin local dye was extracted from hibiscus sabdariffa which is an edible plant called zobo by Nigerians. The sensitized nanocrystalline titanium (iv) oxide was discovered to have a reduced band gap energy and hence could absorb incident solar radiation beyond the ultraviolet region. Avaspec 2.1 Spectrophotometer was employed to determine the optical spectrum, while the Tauc model was used to obtain the optical band gap. The transmittance spectrum was shown, while the nature of the refractive index was studied using the Moss Rule. The behaviour of the extinction coefficient was also investigated. The current-voltage characteristics of a dye sensitized solar cell fabricated with the sensitized nc-TiO2 working electrode was analyzed. The optical band gap of the sensitized nanocrystalline titanium dioxide was 2.59eV, while the conversion efficiency of the dye sensitized solar cell was 0.58%.

Author(s): Laeticia U. Ugwu, Jude O. Ozuomba, Peter I. Ekwo and Azubuike J. Ekpunobi

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