Synthesis of Mesoporous Anatase TiO2 Nanotubes by a Hydrothermal Treatment and Their Use in Solid-State Dye-Sensitized Solar Cells
Mesoporous anatase TiO2 nanotubes (NTs) with the diameter of about 7∼12 nm and the length of several hundred nanometers were synthesized by a hydrothermal method on commercial TiO2 particles in NaOH followed by HCl washing. The samples were characterized by X-ray diffraction (XRD), transmitting electron microscopy (TEM), and Brunauer-Emmet-Teller (BET) measurements. The hydrothermal treatment temperature at 130 °C was shown to affect not only the extent of particle-to-sheet conversion, and thus the resulting structures of the NTs, but also the anatase-to-rutile transformation. The surface area of the NTs was ∼200 m2g−1. This value was much higher in comparison to TiO2 nanoparticles of ∼50 m2g−1. It was also found that the NT photoelectrodes had a pronounced impact on the performance of solar cells as compared to nanoparticle ones. This was probably due to lead to a significantly higher specific dye loading and, for certain hydrothermal treatments, resulting in a doubling of the solar cell efficiency (in our case from 2.84% to 4.03% of AM 1.5 conditions).
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Document Type: Research Article
Publication date: 2011-05-01
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