Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The stability of solar cells is a critical aspect for commercialisation; however, the amount of literature focused on stability, especially in regards to the relatively new cobalt polypyridine electrolyte systems, is severely lacking. The long-term stability benchmark, used accessing iodine electrolyte DSSCs, commonly includes a minimum of 1000 hours of continuous illumination at “1 sun”. Recently, we have demonstrated that DSSCs using cobalt bipyridine complex (Co II / III (Bpy)3) redox couples have promising photostability under one sun equivalent illumination for 2000 hours.1
In this work, we tested cobalt electrolyte cells, under MPP and intermittent illumination, which shows significantly greater stability than under MPP and continuous illumination; both test conditions have equivalent cumulative illumination time. We have also tested the effect of different electrolyte compositions, different dyes and stability testing conditions on the long-term stability. Furthermore, we give new insight into the degradation mechanisms in ageing cobalt electrolyte DSSCs, and propose new strategies to circumvent this.
1. R. Jiang, A. Anderson, P. R. F. Barnes, L. Xiaoe, C. Law, and B. C. O’Regan, J. Mater. Chem. A, 2014, 2, 4751.
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