Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 8, Pages 3356-3361Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am400337d
Keywords
triiodide/iodide redox couple; bis(imidazolium) iodide; low-volatility electrolyte; electrostatic interaction; dye-sensitized solar cells
Funding
- National Basic Research Program of China [2011CB933300]
- National Science Fund for Talent Training in Basic Science [J1210061]
- National Natural Science Foundation of China [51132001, 51272184]
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Bis(imidazolium) iodides (bis-Im(+)I(-)s) are synthesized with different substituents and used as electrolytes in dye-sensitized solar cells (DSSCs). Three kinds of low-volatility electrolytes are prepared by using 1,1'-methylene bis(3-imidazolium) diiodide (MIDI), 1,1'-methylene bis(3-n-methylimidazolium) diiodide (MMIDI), and 1,1'-methylene-bis(3-n-ethylimidazolium) diiodide (MEIDI) as the iodide sources. The effects of these substituents on, the photovoltaic performance of the cells are investigated. It is found that the device shows a lower short-circuit photocurrent (J(sc)), higher open-voltage (Voc) and fill factor (FF) with the increased cation size in electrolyte. These results are explained by electrostatic interactions between the solvated Im+ and the negatively charged species. Meanwhile, the explanation is supported by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), open circuit voltage decay (OCVD), and dark current measurements.
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