Formulation of water to ethanol ratio as extraction solvents of Ixora coccinea and Bougainvillea glabra and their effect on dye aggregation in relation to DSSC performance
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Natural dye sensitizers from Ixora coccinea (anthocyanin) and Bougainvillea glabra (betalain) flowers were prepared in five different ratios of ethanol to water (0, 30, 50, 70, and 90 % ethanol), and the effect of dye aggregation toward dye sensitized solar cell (DSSC) performance was evaluated. As the concentration of ethanol increases, the tendency of dye molecules to aggregate increased in Ixora dye extracts while no definite trend was observed in Bougainvillea dye extracts. The best DSSC performances of Ixora and Bougainvillea dyes exhibited by extracts in 70 % ethanol and 0 % ethanol are 0.58 ± 0.02 and 0.25 ± 0.02 %, respectively. Both high conversion efficiencies were ascribed to high electron density and low charge transfer resistance. From this study, it was revealed that the performances of DSSC could be affected by the formulation of dye aggregation on the TiO2 surface.
KeywordsAnthocyanins Betalains Aggregation Natural dye-sensitized solar cells
The authors thank Associate Professor Dr. Jose Hernandez Santos, Universiti Brunei Darussalam (UBD), for his assistance in cyclic voltammetry measurement. The authors also acknowledge Nur Hidayah binti Haji Annuar for her contribution in the experiment. The Brunei Research Council (BRC) Science and Technology Research Grant S&T 17 is acknowledged for the financial support.
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Conflict of interest
The authors declare that they have no conflict of interest.
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