Hydrothermal Synthesis of One-Dimensional Single-Crystalline Rutile TiO2 Nanostructures and Their Application in Dye-Sensitized Solar Cells
One-dimensional (1D) TiO2 nanowire arrays are fabricated on transparent conducting substrates via a low temperature hydrothermal route for application in dye-sensitized solar cells (DSSCs). The as-prepared sample on fluorine-doped tin oxide (FTO) substrate is found to be single-crystalline rutile TiO2 structures from X-ray and electron diffractions. The length and diameter of the nanowires depend mainly on the growth time and temperature. With increasing the reaction time, the growth rate becomes slower and the interface adhesion between the growth nanowires and the substrate becomes weaker. In the same time the adjacent nanowires aggregate to larger the apparent diameter of the nanowire making the gaps among the nanowires to disappear at last. The nanowires exhibit flower-like morphology on the non-conducting surface of FTO substrate. By using TiO2 nanowire arrays with 2 μm long on FTO substrate as the photoanode in DSSCs, an overall light conversion efficiency of 1.58% is achieved with an open circuit voltage of 0.714 V, a short circuit current density of 4.68 mA cm−2, and a fill factor of 0.472.
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Document Type: Research Article
Publication date: 2011-11-01
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