期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 -, 期 30, 页码 4730-4737出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201100395
关键词
Solar cells; Mesoporous materials; Nanoparticles; Photovoltage transient; Interfacial electron transfer; Electrolyte percolation; Adsorption
资金
- National Natural Science Foundation of China [21031001, 20971040, 21001042, 20703015]
- Ministry of Education of China [708029]
- Program for New Century Excellent Talents in Heilongjiang Provincial University of China [1154-NCET-010]
- Excellent Youth of Common Universities of Heilongjiang Province of China [1154G24]
- Harbin Youth Foundation [2009RFQXG202]
- Heilongjiang Provincial Education Department [11541283, 12511376]
Mesoporous TiO2 (meso-TiO2) is a promising photoelectrical nanomaterial for high dye-sensitised solar cell (DSSC) performance, because its nanochannels offer a large internal surface area to allow for more dye adsorption. The interconnected grains facilitate rapid electron transport both within the meso-TiO2 film and at the film electrode dye/redox shuttle electrolyte interfaces. In this work, a series of DSSCs has been fabricated on the basis of meso-TiO2 with large controllable pore sizes (6.5, 8.2 and 11.0 nm). It was found that the DSSC with the 8.2 nm meso-TiO2 photoelectrode has the highest photoelectrical conversion efficiency, which is higher than that of the conventional P25 nanoparticulate DSSC under the same conditions. The measurements of the N-2 sorption isotherms and the photovoltage transient demonstrates that such improved efficiency can be ascribed to the larger surface area and the fastest interfacial charge transfer. Meanwhile, the effect of different pore sizes on the photoelectrical conversion efficiency has been systematically investigated, and a possible model for the efficient electrolyte percolation in the dye-sensitised mesoporous photoelectrode has been proposed.
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