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Effects of an Al-Incorporated TiO2 Layer on the Photovoltaic Properties of Dye-Sensitized Solar Cells Based on a Co Complex Redox Electrolyte

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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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Keywords: AL2O3; DYE-SENSITIZED SOLAR CELLS; PHOTOELECTRODE; SURFACE TREATMENT; TIO2

Document Type: Research Article

Publication date: April 1, 2016

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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