Abstract
Hierarchically structured TiO2 photo-anodes with ordered macropores and mesopores are prepared by two steps of self-assembling process. Scanning electron microscopy, transmission electron microscopy and small angle X-Ray diffraction measurements show that the samples were of 3D ordered macroporous structure and the ordered framework possessed numerous mesopores. In addition, the obtained TiO2 samples are systematically investigated by Ultraviolet-Visible spectrum, Brunauer-Emniett-Teller analysis. The Dye-Sensitized Solar Cells (DSCCs) fabricated with the 3D ordered macro-/mesoporous (3DOM/m) TiO2 photo-anode achieve a photoelectric conversion efficiency (PCE) of 9.20%, significantly higher than that of the DSSCs assembled with reference TiO2 photo-anodes without hierarchical structures. The enhanced PCE can be attributed to the unique morphology of 3DOM/m TiO2. This study demonstrates high potential of the TiO2 photoanode with hierarchical morphology for DSSC applications.
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