Characterization by electrochemical impedance spectroscopy of a dye-sensitized solar cell using a natural anthocyanin pigment extracted from Sorghum spp
DOI:
https://doi.org/10.13171/mjc02410141804mahamaneAbstract
A natural dye solar cell is a low-cost, environmentally friendly device that converts sunlight into electricity. Charge transport, charge transfer, and charge recombination are the main processes in the dye-sensitized solar cell. However, these processes in these types of cells are still poorly understood. This work aims to characterize the natural dye-sensitized solar cell of Sorghum spp using electrochemical impedance spectroscopy. A liquid-liquid dye separation of an aqueous crude extract of Sorghum spp was carried out with four organic solvents of increasing polarity to identify the most effective extract. Dye-sensitized solar cells with an active surface area of 1 cm2 were fabricated and characterized using the current density-voltage method and electrochemical impedance spectroscopy (EIS) under illumination of 1000 W.m-2. The energy conversion efficiency of the cells from the different extracts ranged from 0.13 to 0.19%. The electron recombination resistance at the TiO2/dye/electrolyte interface varied from 316.59 Ω to 532.27 Ω, and the electron lifetime in TiO2 varied from 24.843 to 49.575 ms. Among the cells studied, those with dyes from dichloromethane (Dcm-Ex) and ethyl acetate (Ea-Ex) extracts had the best performance despite the high electron recombination, compensated by the longer electron lifetime observed in those cells.References
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