期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 16, 期 29, 页码 8757-8761出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201000264
关键词
dye-sensitized solar cells; hollow spheres; nanoparticles; sonochemistry; zinc oxide
资金
- Natural Science Foundations of China [20873183, U0934003]
- Natural Science Foundations of Guangdong Province [8151027501000030]
- Sun Yat-Sen University
Hierarchical ZnO hollow spheres (400-500 nm in diameter) consisting of ZnO nanoparticles with a diameter of approximately 15 nm have been successfully prepared by a facile and rapid sonochemical process. The formation of hierarchical ZnO hollow spheres is attributed to the oriented attachment and subsequent Ostwald ripening process according to time-dependent experiments. The as-prepared ZnO hollow spheres are used as a photoanode in dye-sensitized solar cells and exhibit a highly efficient power conversion efficiency of 4.33%, with a short-circuit current density of 9.56 mA cm(-2), an open-circuit voltage of 730 mV, and a fill factor of 0.62 under AM 1.5 G one sun (1.00 mW cm(-2)) illumination. Moreover, the photovoltaic performance (4.33%) using the hierarchical ZnO hollow spheres is 38.8% better than that of a ZnO nanoparticle photoelectrode (3.12%), which is mainly attributed to the efficient light scattering for the former.
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