Dye-Sensitized Solar Cells: Driving-Force Effects on Electron Recombination Dynamics with Cobalt-Based Shuttles

被引:110
作者
DeVries, Michael J.
Pellin, Michael J.
Hupp, Joseph T. [1 ]
机构
[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
关键词
CHARGE-TRANSFER; PERFORMANCE ENHANCEMENT; MOLECULAR-STRUCTURE; TRANSFER KINETICS; RATE CONSTANTS; TIO2; SEMICONDUCTOR; PHOTOSENSITIZATION; COMPLEXES; RUTHENIUM;
D O I
10.1021/la904643t
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A series of cobalt-containing redox couples, based on [Co(1,10-phenanthroline)(3)](ClO4)(2) and its derivatives, were prepared for use as regenerators/shuttles in dye-sensitized solar cells featuring modified TiO2 photoelectrodes. Surface modification and trap-state passivation of the TiO2 nanoparticle film electrodes were accomplished via atomic layer deposition of an ultrathin alumina coating. Electron lifetimes were then extracted from open-circuit voltage decay measurements. Cells employing alumina barrier/passivation layers exhibited higher open-circuit voltages as shuttles with more positive redox potentials were used, with the Co(5-nitro-phen)(3)(3+ 2+) couple exhibiting the highest V-oc (0.844 V). Analysis of the open-circuit voltages and electron lifetimes indicate Marcus normal-region behavior for back electron transfer front the TiO2 photoanode to these compounds.
引用
收藏
页码:9082 / 9087
页数:6
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