Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (06): 1368-1372.doi: 10.3866/PKU.WHXB201203161

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Fabrication of Nanosheet/Nestlike Nanoarray Hierarchical TiO2 Film for Dye-Sensitized Solar Cell

CHANG Meng-Lei1,2, LI Xin-Jun1   

  1. 1. Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2012-02-17 Revised:2012-03-14 Published:2012-05-17
  • Contact: LI Xin-Jun
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51172233) and National Key Basic Research Program of China (973) (2009CB220002).

Abstract: A hierarchical configuration of TiO2 nanoarray film, comprising a nestlike TiO2 nanoarray layer integrated with a nanosheet network overlayer, was constructed. The hierarchical TiO2 film was obtained by the post-hydrothermal treatment with NaOH solution on hydrothermally synthesized TiO2-derived nanostructured arrays grown on fluorine-doped tin oxide substrate (FTO). The TiO2 films were characterized by field-emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopy, and absorbance spectroscopy. FE-SEM shows that the hierarchical TiO2 film with a thickness of 1.5 μm is composed of a nanosheet overlayer (~0.2 μm height) and the nestlike nanoarray layer (~1.3 μm height). XRD patterns display that the TiO2 films have pure anatase phase structure. UV-Vis spectra reveal enhanced light scattering and dye adsorption ability of the hierarchical TiO2 film. For the dye-sensitized solar cell (DSSC) based on the nanosheet/nestlike nanoarray hierarchical TiO2 film, a short-circuit current (Jsc) of 7.79 mA·cm-2, open-circuit voltage (Voc) of 0.80 V, fill factor (FF) of 0.40, and photoelectric conversion efficiency (η) of 2.48% are achieved. Within the dye-sensitized solar cell, the photoelectric conversion efficiency of the hierarchical TiO2 film was nearly ten times higher than that of nanostructured array film.

Key words: TiO2, Nanosheet/nestlike nanoarray, Hydrothermal synthesis, Dye-sensitized solar cell, Photoelectric conversion


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