A Composite Photoanode Based on P25/TiO2 Nanotube Arrays/Flower-Like TiO2 for High-Efficiency Dye-Sensitized Solar Cells

doi:10.1007/s40195-016-0460-8

Abstract

Abstract:

In this work, a three-layer TiO₂ composite film consisting of flower-like TiO₂ (Flo-TiO₂) as overlayer, TiO₂ nanotube arrays as interlayer and TiO₂ nanoparticle (P25) as underlayer was fabricated as the photoelectrode of dye-sensitized solar cells (DSSCs). Due to the introduction of Flo-TiO₂, the three-layer composite film has strong light-scattering ability. Then, we have investigated and compared the photoelectric conversion properties of DSSCs based on three-layer structure (P25/TNT arrays/Flo-TiO₂) photoelectrode and double-layer film (P25/TNT arrays) photoelectrode. It is found that DSSCs based on three-layer structure exhibit a high power conversion efficiency of 6.48% compared with the DSSCs composed of double-layer film (5.11%).

Key words: Dye-sensitized solar cells (DSSCs), Flower-like TiO₂, Composite films, Photoanodes, Photoelectric conversion performances

Jing-Hua Hu,Sheng-Qiang Tong,Ying-Ping Yang,Jie-Jie Cheng,Li Zhao,Jin-Xia Duan. A Composite Photoanode Based on P25/TiO₂ Nanotube Arrays/Flower-Like TiO₂ for High-Efficiency Dye-Sensitized Solar Cells[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(9): 840-847.

Figures/Tables 9

Fig. 1 XRD patterns of TiO2 nanotube (TNT) arrays a and flower-like TiO2b

Fig. 2 SEM images of TiO2 nanotube arrays in top view a, in bottom view b, in cross-sectional view c and cross-sectional SEM image of P25/TNT composite film d

Fig. 3 Schematic illustrating the fabrication process of P25/TNT double-layer film and P25/TNT/Flo-TiO2 three-layer film

Fig. 4 SEM image of the surface of flower-like TiO2a, TEM image of flower-like TiO2b, the selected area TEM image of flower-like TiO2c and cross-sectional SEM image of three-layer composite film d

Fig. 5 Diffused reflectance spectra of DSSCs based on P25/TNT double-layer film and P25/TNT/Flo-TiO2 three-layer composite film

Fig. 6 I-V performance of the DSSCs based on P25/TNT/Flo-TiO2 three-layer composite film and P25/TNT double-layer film in the dark a and under AM 1.5 illuminations b

Fig. 7 EIS spectra of the DSSCs based on P25/TNT/Flo-TiO2 three-layer composite film and P25/TNT double-layer film: a Nyquist plots and b Bode phase plots

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A Composite Photoanode Based on P25/TiO₂ Nanotube Arrays/Flower-Like TiO₂ for High-Efficiency Dye-Sensitized Solar Cells

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