Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Faster dye regeneration kinetics can significantly improve dye-sensitized solar cell (DSC) performance. In a system with the organic triphenylamine based sensitizer LEG4 and cobalt(II/III)trisbipyridine redox electrolyte, addition of a simple organic reductant was found to lead to higher photocurrent (by 10%) , photovoltage (by 100 mV) and solar cell performance (by more than 1% unit). This improvement is attributed to ultrafast reduction of the oxidized dye. In the standard Co(II)(bpy)3 electrolyte the oxidized dye is regenerated on the microsecond time scale, while the kinetics using the organic reductant is much faster, by more than one order of magnitude.
The remarkable improvement of DSC performance by the intermediate redox component gives evidence for significant recombination of electrons in the mesoporous TiO2 to the oxidized dye when regeneration is “slow”, especially in the maximum power point (MPP). This recombination mechanism has been largely ignored or underestimated in previous studies.
Good stability was found for solar cells with Co(II)(bpy)3 plus reductant as electrolyte under 1 sun illumination and under MPP tracking conditions.
Implications of this finding on dye-sensitized solar cells will be discussed.
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