Effects of substituents of imidazolium cations on the performance of dye-sensitized TiO2 solar cells

Imidazolium iodides (Im + I − s) were synthesized with different substituents of the cation and used as electrolytes in dye-sensitized solar cells (DSSCs), and the effects of such substituents were investigated in terms of the photovoltaic performance of the cells. Synthesized iodides were verified...

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Veröffentlicht in:Journal of applied electrochemistry 2008-12, Vol.38 (12), p.1647-1652
Hauptverfasser: Son, Kyung Mo, Kang, Man Gu, Vittal, R., Lee, Jiwon, Kim, Kang-Jin
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Sprache:eng
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Zusammenfassung:Imidazolium iodides (Im + I − s) were synthesized with different substituents of the cation and used as electrolytes in dye-sensitized solar cells (DSSCs), and the effects of such substituents were investigated in terms of the photovoltaic performance of the cells. Synthesized iodides were verified by 1 H-NMR. Among the iodides, 1,3-diethylimidazolium iodide enabled a solar energy conversion efficiency of 4.8% for its DSSC, while 1-(4-acetophenyl)-3-ethylimidazolium iodide rendered an efficiency of 3.1% for its cell. In all cases the short-circuit photocurrent ( J sc ) was found to increase with decrease in size of the substituent, which was also verified to be valid in the case of a quasi-solid state DSSC. Results are explained by the electrostatic interactions between solvated Im + and negatively charged species based on the correlation between diffusion coefficients of I − and I 3 − and J sc values. These explanations are supported by steady-state voltammetry and electrochemical impedance spectroscopy (EIS).
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-008-9611-6