Abstract
We herein present a useful technique to design photo-anode films by composing P25 nanoparticles (NPs) with TiO2 nanorod or TiO2 nanotube arrays to optimize the photocatalysis property and overall property of dye-sensitized solar cells (DSSCs). After solvothermal and spin-coating process, an interesting hierarchical film containing one-dimensional (1D) TiO2 film and P25 NPs (1D TiO2/P25) was obtained on a fluorine-doped tin oxide substrate. In our study, P25 NPs with high specific surface area can potentially adsorb large numbers of dye molecules when 1D TiO2 arrays provide a straight path for rapid transmission of photo-generated electrons. From the experiment results, the hierarchical photo-anodes indeed exhibit superior properties than that of pristine 1D films. The photoelectric conversion efficiency improves up to 3.96 and 3.69% based on 1D TiO2/P25 DSSCs, which are significantly higher than those of 3.21 and 2.70% of the DSSCs based on 1D TiO2 photoanodes.
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