International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 9, September 2017

International Journal of Science and Technology

Extract from cynodon dactylon: A viable alternative to ruthenium based complexes for dye sensitized solar cells

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Author Jude O. Ozuomba, Azubuike J. Ekpunobi
Volume No. 5
Issue No. 7
Issue Date July 01, 2015
Publishing Date July 01, 2015
Keywords Ruthenium, bahama grass, photovoltaic performance, dye sensitized cell


Dye sensitized solar cells (DSSCs) are devices that convert visible light into electricity based on the photosensitization of wide band-gap semiconductors, such as TiO2, SnO or ZnO. Most of the efficient DSSCs are sensitized with the dyes having ruthenium based complexes. We have compared the performance of a dye sensitized solar cell based on chlorin dye with that of a ruthenium based DSSC and a plain cell. Chlorin dye was extracted from cynodon dactylon which is popularly called bahama grass and titanium (iv) oxide was our wide band-gap semiconductor. The absorption spectrum revealed that the ruthenium dye peaked at 264nm, while the chlorin dye peaked at 355nm and 505nm. Meanwhile, both dyes showed appreciable absorbance beyond the ultraviolet region. The conversion efficiency for the cells were 1.7%, 1.008% and 0.03% for the ruthenium, chlorin and plain cells respectively. A diurnal study of their electrical characteristics showed that the local dye from cynodon dactylon is a viable sensitizer for TiO2. Avaspec 2.1 spectrophotometer was used to obtain the optical absorption spectrum, while an Oriel class A solar simulator was used for current-voltage characterization.

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