期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 117, 期 6, 页码 2574-2583出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp304607f
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资金
- European project ESCORT - Efficient Solar Cells based on Organic and hybrid Technology (seventh FWP) [261920]
- Italian Ministry of Education, University and Research through the project AEROCOMP (contract MIUR) [DM48391]
Three families of linear shaped TiO2 anatase nanocrystals with variable aspect ratio (4, 8, 16) and two sets of branched TiO2 anatase nanocrystals (in the form of open-framework sheaf-like nanorods and compact braid-like nanorod bundles, respectively) were employed to fabricate high-quality mesoporous photoelectrodes and then implemented into dye-sensitized solar cells to elucidate the intrinsic correlation holding between the photovoltaic performances and the structure of the nanocrystal building blocks. To this aim, the chemical capacitance and the charge-transfer resistance of the photoelectrodes were extrapolated from electrochemical impedance spectroscopy measurements and used to draw a quantitative energy diagram of the dye-sensitized solar cells realized, on the basis of which their photovoltaic performances have been discussed. It has thus been revealed that photoanodes made from braid-like branched-nanorod bundles exhibited the most favorable conditions to minimize recombination at the interface with the electrolyte due to their deep distribution of trap states, whereas linear-shaped nanorods with higher aspect-ratios result in more remarkable downshift of the conduction band edge.
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