Abstract
Power conversion efficiency (PCE) of SnO2-based dye-sensitized solar cells (DSSCs) increases slowly over a period of days after the fabrication in the reported work. The slow increase in PCE is indirectly interpreted as the oxygen adsorption effect on the surface of SnO2 photoanode. In this work, therefore, SnO2 films were annealed again under air, pure oxygen and 5% hydrogen/nitrogen atmosphere, respectively, to verify oxygen effect on the performance of SnO2-based DSSCs. Compared to 5% H2/N2, the grain size of the SnO2 film annealed under air and O2 decreased from 38.45 to 30.14 and 27.90 nm respectively, based on X-ray diffraction (XRD) results. X-ray photoelectron spectroscopy (XPS) results indicate that the Sn 3d and O 1 s binding energy of SnO2 film annealed under air or O2 shifts toward low binding energy compared with 5% H2/N2. The conduction band (CB) values of the film annealed under air, O2 and 5% H2/N2 are − 4.527, − 4.372 and − 4.689 eV, respectively, obtained by UV–vis absorption spectra and ultraviolet photoelectron spectroscopy (UPS). Reduced energy band offset between dye and SnO2 photoanode accelerates the electron injection rate resulting in the improvement of open-circuit voltage Voc. Compared with 5% H2/N2, chemical capacitance Cμ of devices based on photoanode annealed under air and O2 decreases, while transfer resistor Rct increases by electrochemical impedance spectroscopy (EIS) measurement, improving a facilitated charge extraction and suppressing charge recombination of photogenic electron on the SnO2/electrolyte (EL) interface. Our results verify that oxygen effect plays a critical role in the improvement of Voc and PCE for DSSCs based on SnO2 photoanode.
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This work was supported by National Natural Science Fund of China (11964019, 62065014).
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Wang, D.Y., Xiao, W., Duan, J.H. et al. Oxygen effect on the slow increase of power conversion efficiency of dye-sensitized solar cells via SnO2 photoanode post-annealed under different atmosphere. Indian J Phys 98, 1611–1621 (2024). https://doi.org/10.1007/s12648-023-02924-4
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DOI: https://doi.org/10.1007/s12648-023-02924-4