期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 41, 页码 16448-16452出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm12710a
关键词
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资金
- Natural Science Foundation of China [20871096, 21001084]
- Fundamental Research Funds for the Central Universities, China [2081003, 203275119]
A novel iodine-free quasi solid-state electrolyte employing an ionic liquid (1, 2-dimethyl-3-propylimidazolium iodide, DMPII) as charge transfer intermediate was developed for dye-sensitized solar cells (DSSCs). Simultaneously, potassium iodide (KI) was incorporated into the electrolyte as charge transfer auxiliary agent. The dependences of photovoltaic performances and ionic conductivities on the iodine-free quasi solid-state electrolyte containing different KI concentrations were investigated. The strong interactions between the potassium cations and polyethylene oxide (PEO, MW = 100,000) can prevent the crystallization of the electrolyte and enhance its ionic conductivity. An optimal photoelectric conversion efficiency (eta) of 5.87% can be obtained for the DSSC fabricated with the iodine-free electrolyte containing 5 wt% KI, and the corresponding value without KI is 4.05%, indicating the remarkable progress made by addition of KI into electrolyte.
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