Effects of substituents of imidazolium cations on the performance of dye-sensitized TiO2 solar cells
- Authors
- Son, Kyung Mo; Kang, Man Gu; Vittal, R.; Lee, Jiwon; Kim, Kang-Jin
- Issue Date
- 12월-2008
- Publisher
- SPRINGER
- Keywords
- Solvated imidazolium cation; Dye-sensitized solar cells; Solar energy conversion efficiency; Short-circuit photocurrent; Electrostatic interaction
- Citation
- JOURNAL OF APPLIED ELECTROCHEMISTRY, v.38, no.12, pp.1647 - 1652
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF APPLIED ELECTROCHEMISTRY
- Volume
- 38
- Number
- 12
- Start Page
- 1647
- End Page
- 1652
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/122261
- DOI
- 10.1007/s10800-008-9611-6
- ISSN
- 0021-891X
- Abstract
- Imidazolium iodides (Im+sI) 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-s I-3 and J (sc) values. These explanations are supported by steady-state voltammetry and electrochemical impedance spectroscopy (EIS).
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