This paper reports the novel efficiency achievement of black rice-based natural dyesensitized solar cells. The higher dye concentration, the longer dye extraction as well as dye immersion onto a TiO2 film, and the co-adsorption addition are key strategies for improved-cell performance compared to the highest previous achievement. The black rice dye containing 1.38 mM cyanidin-3-O-glucoside has been extracted without purification for 3 weeks at dark condition and room temperature. The anatase TiO2 photoanode was dipped into dye solution within 4 days. Its electrode was firmly sealed to be a cell and was filled by I-/I3- electrolyte using vacuum technique. As a result, the overall solar-to-energy conversion efficiency was 1.49% at AM 1.5 illumination (100 mW.cm-2). The voltametric analysis has reported the interfacial electronic band edges of TiO2-Dye-Electrolyte. Furthermore, electrochemical impedance spectroscopy has shown the kinetic of interfacial electron transfer dynamics among TiO2-dyeelectrolyte. The cell has the transfer resistance (Rt) of 12.5 Ω, the recombination resistance (Rr) of 266.8 Ω, effective electron diffusion coefficients (Dn) of 1.4 x 10-3 cm2/s, Dye-TiO2 effective electron transfer (τd) of 26.6 μs, effective diffusion length (Ln)of 33.78 μm, chemical capacitance (Cμ) of 12.43 μF, and electron lifetime (τn) of 3.32 ms.
(PDF) Charge Transfer Dynamics of Highly Efficient Cyanidin-3-O- Glucoside Sensitizer for Dye-Sensitized Solar Cells. Available from: https://www.researchgate.net/publication/308535253_Charge_Transfer_Dynamics_of_Highly_Efficient_Cyanidin-3-O-_Glucoside_Sensitizer_for_Dye-Sensitized_Solar_Cells [accessed Jun 26 2018].