Bis(1,1-bis(2-pyridyl)ethane)copper(i/ii) as an efficient redox couple for liquid dye-sensitized solar cells
2016
Cong, Jiayan | Kinschel, Dominik | Daniel, Quentin | Safdari, Majid | Gabrielsson, Erik | Chen, Hong | Svensson, Per H. | Sun, Licheng | Kloo, Lars
A new redox couple, [Cu(bpye)₂]⁺/²⁺, has been synthesized, and applied in dye-sensitized solar cells (DSSCs). Overall efficiencies of 9.0% at 1 sun and 9.9% at 0.5 sun were obtained, which are considerably higher than those obtained for cells containing the reference redox couple, [Co(bpy)₃]²⁺/³⁺. These results represent a record for copper-based complex redox systems in liquid DSSCs. Fast dye regeneration, sluggish recombination loss processes, faster electron self-exchange reactions and suitable redox potentials are the main reasons for the observed increase in efficiency. In particular, the main disadvantage of cobalt complex-based redox couples, charge-transport problems, appears to be resolved by a change to copper complex redox couples. The results make copper complex-based redox couples very promising for further development of highly efficient DSSCs.
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