期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 4, 页码 1627-1633出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm14489h
关键词
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资金
- National Natural Science Foundation of China [20873183, 21073239, U0934003]
- Fundamental Research Funds for the Central Universities
- Research Fund for the Doctoral Program of Higher Education [20100171110014]
Yolk-shell TiO2 beads consisting of nanoparticles are synthesized by using a facile hydrothermal method. The influences of hydrothermal reaction temperature on the size of TiO2 particles and the photovoltaic performance of dye-sensitized solar cells (DSSCs) have been investigated in detail. A DSSC based on the yolk-shell TiO2 bead photoelectrode (similar to 15 mu m) exhibits an energy conversion efficiency of 9.05%, which is much higher than that of P25 (7.56%). This can be mainly attributed to the fast electron transport and long electron lifetime resulting in a larger electron diffusion coefficient and higher charge collection efficiency for the former, which are confirmed by intensity-modulated photocurrent spectroscopy (IMPS), intensity-modulated photovoltage spectroscopy (IMVS), and electrochemical impedance spectroscopy (EIS). In addition, the superior light scattering ability of hierarchical yolk-shell TiO2 beads compared to P25 film measured by UV-vis diffuse spectrum also contributes to higher photocurrent and photovoltaic performance.
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