Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The most commonly used redox mediators in dye-sensitized solar cells (DSCs)1, iodide/triiodide and cobalt trisbipyridine, were successfully replaced by copper complex based electrolytes.2 The use of series of copper complexes based electrolytes led to an exceptionally high photovoltaic performance over 10 % for Y123-sensitized TiO2 solar cells, with a remarkably high open-circuit potential of above 1.0 V at 1000 Wm2 under AM1.5G conditions. The copper complex based redox electrolyte has higher diffusion coefficients and is considerably faster in dye regeneration than comparable cobalt trisbipyridine-based electrolytes.3 A driving force for dye regeneration of only 0.2 eV is sufficient to obtain unit yield, pointing to new possibilities for improvement in DSC efficiencies. The interaction of the excited dye with components of the electrolyte was monitored using steady state emission measurements and time-correlated single photon counting (TC-SPC).4 Our results indicate bimolecular reductive quenching of the excited dye by the copper complex through a dynamic mechanism. Quenching competes with electron injection and results in a lower photocurrent.
(1) Feldt, S. M.; Lohse, P. W.; Kessler, F.; Nazeeruddin, M. K.; Grätzel, M.; Boschloo, G.; Hagfeldt, A. Phys. Chem. Chem. Phys. 2013, 15 (19), 7087.
(2) Zhou, D.; Yu, Q.; Cai, N.; Bai, Y.; Wang, Y.; Wang, P. Energy Environ. Sci. 2011, 4 (6), 2030.
(3) Freitag, M.; Daniel, Q.; Pazoki, M.; Sveinbjornsson, K.; Zhang, J.; Sun, L.; Hagfeldt, A.; Boschloo, G. Energy Environ. Sci. 2015.
(4) Clark, C. C.; Marton, A.; Srinivasan, R.; Narducci Sarjeant, A. A.; Meyer, G. J. Inorg. Chem. 2006, 45 (12), 4728
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