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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 5
BKCSDE 33(5)
May 20, 2012 

A Series of N-Alkylimidazolium Propylhexanamide Iodide for Dye-Sensitized Solar Cells
Sung-Su Lim, Subrata Sarker, Sunyoung Yoon, Narayan Chandra Deb Nath, Young Jun Kim, Heung Bae Jeon,* Jae-Joon Lee*
Imidazolium iodide, Electrolyte, Gel electrolyte, Binary ionic liquid, Dye-sensitized solar cells
We report a series of novel imidazolium iodides based ionic liquids (NMIPHI, NAIPHI, and NBIPHI) with different functional groups for the development of a quasi-solid type electrolyte for dye-sensitized solar cells (DSSCs). The diffusion coefficients of redox ions (I− and I3 −) are dependent on the molecular weight and it was higher for lighter salts. Among the three ionic liquids, NMIPHI showed highest efficiency of 4.18% when it was used in a liquid electrolyte of a DSSC with ca. 6 μm thick TiO2 mesoporous film. Even though the efficiency was ca. 19% lower than that obtained from a liquid electrolyte composed of PMII. When NMIPHI was mixed with PMII with a molar ratio of 1:1 in a solvent free electrolyte, the efficiency of the DSSCs was enhanced compared to that based on pristine PMII.
1480 - 1484
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