Effects of an Al-Incorporated TiO2 Layer on the Photovoltaic Properties of Dye-Sensitized Solar Cells Based on a Co Complex Redox Electrolyte
The influences of a mixed overlayer composed of both TiO2 and Al2O3 on the performance of dye-sensitized solar cells (DSSCs) based on a Co complex redox electrolyte were investigated. The surface of TiO2 films formed on F-doped SnO2(FTO) glass substrates was modified by soaking them in a TiCl4:AlCl3 mixed aqueous solution at various molar ratios, and calcining them to produce the surface-modified photoelectrodes (Ti:Al-TiO2/FTO). Significant improvement in the power conversion efficiency (2.81%) of the resulting DSSCs with Ti:Al (9:1)-TiO2/FTO, which was prepared from the mixed solution at a molar ratio of 9:1 (TiCl4:AlCl3), was achieved compared to that (1.05%) of the reference cell with the bare TiO2/FTO. A series of measurements, such as the Bode/Nyquist plots of the impedance spectroscopy, dark current and incident photon-to-current conversion efficiency, showed that the incorporation of a mixed overlayer onto the TiO2 film led to the retardation of the charge recombination between the photo-injected electrons and Co complex redox electrolyte, resulting in an enhanced short-circuit current and open-circuit current, compared to those of the reference device without surface modification.
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Document Type: Research Article
Publication date: April 1, 2016
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