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

作者：DeVries Michael J; Pellin Michael J; Hupp Joseph T^*

来源：Langmuir, 2010, 26(11): 9082-9087.

DOI：10.1021/la904643t

A series of cobalt-containing redox couples, based on [Co(1,10-phenanthroline)(3)](ClO(4))(2) and its derivatives, were prepared for use as regenerators/shuttles in dye-sensitized solar cells featuring modified TiO(2) photoelectrodes. Surface modification and trap-state passivation of the TiO(2) 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 TiO(2) photoanode to these compounds.

• 出版日期2010-6-1
• 单位西北大学