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Effects of substituents of imidazolium cations on the performance of dye-sensitized TiO2 solar cells
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- Authors
- Kyung Mo Son, Man Gu Kang, R. Vittal, Jiwon Lee, Kang-Jin Kim
- Issue Date
- 2008-12
- Citation
- Journal of Applied Electrochemistry, v.38, no.12, pp.1647-1652
- ISSN
- 0021-891X
- Publisher
- Springer
- Language
- English
- Type
- Journal Article
- Abstract
- 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 1H-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). © 2008 Springer Science+Business Media B.V.
- KSP Keywords
- 1H NMR, Charged species, Conversion efficiency(C.E.), Diffusion coefficient(D0), Dye-sensitized solar cells(DSCs), Effects of substituents, Electrostatic interaction, Imidazolium cations, Impedance spectroscopy(IS), J sc, Negatively charged