Charge Transfer Dynamics of Highly Efficient Cyanidin-3-O- Glucoside Sensitizer for Dye-Sensitized Solar Cells

6th Asian Physics Symposium

Prima, E.C.^1,2,3 ; Yuliarto, B.^1 ; Suyatman^1 ; Dipojono, H.K.^2

Advanced Functional Material Laboratory, Department of Engineering Physics, Institut Teknologi, Bandung, Indonesia^1

Computational Material Design and Quantum Engineering Laboratory, Department of Engineering Physics, Institut Teknologi, Bandung, Indonesia^2

Science Laboratory, Department of Science Education, Universitas Pendidikan Indonesia, Indonesia^3

关键词: Charge-transfer dynamics;    Chemical capacitance;    Effective diffusion length;    Effective electrons;    Electron lifetime;    Interfacial electron transfer dynamics;    Transfer resistance;    Vacuum techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/739/1/012031/pdf
DOI  :  10.1088/1742-6596/739/1/012031

来源: IOP

【 摘 要 】

This paper reports the novel efficiency achievement of black rice-based natural dye- sensitized solar cells. The higher dye concentration, the longer dye extraction as well as dye immersion onto a TiO2film, 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 TiO2photoanode 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-dye-electrolyte. 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 × 10-3cm2/s, Dye-TiO2effective 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.