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Performance Improvement of Dye-Sensitized Solar Cells Using Room-Temperature-Synthesized Hierarchical TiO2 Honeycomb Nanostructures
- Chu, Fei, Li, Wei, Shi, Chunsheng, Liu, Enzuo, He, Chunnian, Li, Jiajun, Zhao, Naiqin
- ACS Applied Materials & Interfaces 2013 v.5 no.15 pp. 7170-7175
- combs (social insects), foil, nanoparticles, nanotubes, nanowires, photovoltaic cells, surface area, titanium dioxide
- Highly ordered hierarchical TiO₂ nanostructures involving primary honeycomb and secondary nanoparticles and nanowires are prepared by a two-step facile process. The TiO₂ nanotube arrays grow first on Ti foil through anodization. After the wet-chemical reaction of the TiO₂ nanotube arrays with alkaline and acid solution in turn, the hierarchical nanostructures wire-in-honeycomb and porous honeycomb are obtained by a dissolution–coagulation and dissolution–adsorption mechanism, respectively. The power conversion efficiency of the hierarchical TiO₂ honeycomb nanostructures for the dye-sensitized solar cells (DSCs) shows a significant improvement, as high as 5.73%, increased by 1.42 times compared with that of TiO₂ nanotube arrays. The performance improvement of DSCs based on the hierarchical nanostructures is attributed to the increase in the specific surface area.