Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
As one of the most important functional metal oxides, titanium dioxide (TiO2), especially anatase TiO2, has promising applications in a wide range of fields including electronics, optics, catalysis, energy storage and ceramics. Recently, Yang et al. has first demonstrated anatase TiO2 single crystals with 47% {001} facets synthesized in a fluorine system[1]. Through it has been widely investigated, it is still an intense problem to prepare stable and durable TiO2 films with favorable performance. However, the presence of cement among the TiO2 nanoparticles, forming stable cemented networks, which is a homogeneous porous material, may provide a feasible approach toward these problems.
In this work, we employ the metastable anatase TiO2 nanosheets[2]as cement and the TiO2 nanoparticles as aggregates, the porous concrete of stable nanoparticles can be obtained which can be assembled as photoanode after heat treatment. Interestingly, we found the metastable anatase TiO2 nanosheets disappeared after heat treatment and ultrathin coating can be observed coated on the particles uniformly. In this system, the cement can provide considerable adhesion stress and toughness between the aggregates and the TiO2 particles act as the backbone of the electrode.
Finally, such cemented structure not only exhibits high specific surface area, but also has firm connection between each nanoparticle which can provide rapid electron transfer pathway and enhance the stability of photoanode. Indeed, dye-sensitized solar cells based on these photoanodes have yielded much improved efficiency compared to cells prepared with standard Degussa P25 TiO2 photoanodes. This method of cementing mesoscopic TiO2 films may open up an alternative avenue for the development of high-performance photovoltaic devices including dye-sensitized solar cells and perovskite-based hybrid solar cells.
[1] H. G. Yang, et al. Nature. 453, 638-641 (2008) [2] H. G. Yang, et al. CrystEngComm. 13, 1378-1383 (2011)
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