期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 16, 页码 7910-7918出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm16148f
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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]
- Key Laboratory of Photochemical Conversion and Optoelectronic materials (Technical Institute of Physics and Chemistry, Chinese Academy of Science)
Different morphologies of anatase TiO2 from nanoparticles, nanofibers, and hierarchical spheres to ellipsoid spheres are successfully fabricated via solvothermal reactions of titanium n-butoxide and acetic acid. The variations of morphology, size and crystal phase of TiO2 micro-/nanostructures are investigated in detail by XRD, FTIR, SEM and TEM. Effects of different TiO2 morphologies on the photovoltaic performance of dye-sensitized solar cells (DSSCs) are also discussed based on I-V, IPCE, IMPS, IMVS and UV-vis absorption and diffuse spectra. The DSSC based on the hierarchical anatase TiO2 sphere photoelectrode shows an overall light-to-electricity conversion efficiency of 9.35% accompanying a short-circuit current density of 17.94 mA cm(-2), an open-circuit voltage of 803 mV and fill factor of 0.65, which is much higher than that of nanoparticles (7.37%), nanofibers (8.15%) and ellipsoid TiO2 spheres (7.93%). The significant enhancement of short-circuit current density and power conversion efficiency for the hierarchical sphere-based DSSC compared to other nanostructures is mainly attributed to the larger dye loading, superior light scattering ability, and/or faster electron transport and longer electron lifetime.
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