Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Previously, several reports have focused on the stability concerning the future commercial potential of Co(II/III)-based, liquid dye-sensitized solar cells (DSCs); most of them reported on solvent alternatives with high boiling point and less labile cobalt complex redox systems.[1-4] In this work, the long-term efficient performance of [Co(bpy)3]3+/2+-mediated DSCs has been achieved by a simple optimization on the composition of a acetonitrile-based electrolyte. Concentrations of the cobalt complex redox couple have been demonstrated crucial for the long-term device stability; relatively high concentrations were preferred in this regard. Effects of necessary additives for cobalt-based DSCs were also investigated, including lithium salts and Lewis bases. A significant degradation of DSCs was observed upon increasing the amount of 4-tert-butyl pyridine (TBP) gradually from 0 M to 0.7 M, which as proposed is attributed to the inordinate Lewis basicity of TBP. The adverse influence of Li+ on the device durability, especially in the terms of the open-circuit voltage, was revealed by the comparison with lithium-free devices, which as well exhibited a comparable efficiency after activated by a prior light soaking treatment. Relevant cation additive effect was further examined based on this observation.
Fig. 1 Efficiency variation of DSCs under full sun irradiation (>400 nm), 60 °C. Higher (Hi-) and normal (Lo-) concentrations of [Co(bpy)3]3+/2+ were respectively used; the formal was also used in lithium-free electrolyte (AN-Hi).
[1] M. K. Kashif; M. Nippe; N. W. Duffy; C. M. Forsyth; C. J. Chang; J. R. Long; L. Spiccia; U. Bach. Stable Dye-Sensitized Solar Cell Electrolytes Based on Cobalt(II)/(III) Complexes of a Hexadentate Pyridyl Ligand. Angew. Chem. Int. Ed. 2013, 52, 5527-5531. [2] W. Xiang; F. Huang; Y.-B. Cheng; U. Bach; L. Spiccia; Aqueous dye-sensitized solar cell electrolytes based on the cobalt(II)/(III) tris(bipyridine) redox couple. Energy & Environ. Sci. 2013, 6, 121-127. [3] D. Xu; H. Zhang; X. Chen; F. Yan; Imidazolium functionalized cobalt tris(bipyridyl) complex redox shuttles for high efficiency ionic liquid electrolyte dye-sensitized solar cells. J. Mater. Chem. A. 2013, 1, 11933-11941. [4] W. Xiang; W. Huang; U. Bach; L. Spiccia. Stable high efficiency dye-sensitized solar cells based on a cobalt polymer gel electrolyte. Chem. Comm. 2013, 49, 8997-8999.
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