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Trends in Applied Sciences Research

Year: 2012  |  Volume: 7  |  Issue: 7  |  Page No.: 558 - 564

Bitter Leaf (Vernonia amygdalin) for Dye Sensitized Solar Cell

A.O. Boyo, M.B.O. Shitta, T. Oluwa and S. Adeola

Abstract

Dye sensitized solar cells, are one of the most promising devices for solar energy conversion into electricity, due to their reduced production cost and low environmental impact especially those sensitized by natural Dyes. This study used bitter leaf extract as the natural dyes for a dye sensitized solar cell (DSSC). The Soxhlet ethanol extraction method was used to extract the dye from the bitter leaf. The energy conversion efficiency and fill factor of this solar cells sensitized by bitter leaf extract is 0.69 and 0.81%. A phytochemical screening was performed for flavonoids and anthraquinones test. The extract obtained indicates the presence of flavonoids and less anthraquinones. We notice that the pH of extract solution has a significant effect on the performance of DSSCs. The efficiency was found to increase with decreasing pH and reached a maximum at the optimum pH 1.0. This might be due the absorption of more light by photoanode made from the bitter leaf extract at pH 1.0 and there is better DSSC stability as pH decreases. The results show a possible conversion of visible light into electricity using locally source conducting glass (mirror).

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