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 |
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Format: | Artikel |
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). |
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ISSN: | 0021-891X 1572-8838 |
DOI: | 10.1007/s10800-008-9611-6 |