Hierarchical multilayer-structured TiO2 electrode for dye-sensitized solar cells

作者：Subramanian Alagesan; Wang Hong Wen^*

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2014, 279: 32-37.

DOI：10.1016/j.jphotochem.2014.01.011

• Hierarchical structure
• Multilayer structure
• TiO2 electrode
• Dye sensitized solar cell

A hierarchal multilayer-structured photoelectrode was prepared and the performance of dye-sensitized solar cell was compared with the standard P25 electrodes in different thickness and bilayer-structured TiO2 electrode. Scanning electron microscope and X-ray diffraction patterns were used to analyze the morphology and crystal phases of these electrodes. The multilayer-structured photoelectrode showed a superior performance compared to those of the other three electrodes. The enhancement was attributed to higher amount of dye adsorption, large incident photon-to-current conversion yield due to greater fraction of light scattering and the good charge transportation because of the optimized structure of the TiO2 electrode. The UV-vis measurement confirmed the higher dye loading capacity of the multilayered-structure. Electrochemical spectra (EIS) were used to analyze the charge transport kinetic in these electrodes. The EIS analysis showed large electron injection rate, the suppression of recombination rate and longer electron lifetime in the multilayer-structured photoelectrode due to the optimized structure. The incident photon-to-current conversion efficiency measurement revealed the greater light harvesting efficiency of the multilayer-structured photo-electrode.

• 出版日期2014-4-1