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An ionic liquid-based polymer with π-stacked structure as all-solid-state electrolyte for efficient dye-sensitized solar cells



An ionic liquid based polymer, poly(1-ethyl-3-(acryloyloxy)hexylimidazolium iodide) (PEAI), was synthesized and employed as electrolyte to fabricate all-solid-state dye-sensitized solar cells. The photophysical properties of PEAI were studied by UV–vis absorption spectroscopy and photoluminescence spectroscopy. PEAI exhibited significant hypochromism and red shift in UV–vis absorption spectra and large Stokes shifts in photoluminescence spectra, indicating the formation of a novel π-stacked structure in which the imidazolium rings in the side chain were stacked. Without iodine in its preparation, DSC with PEAI electrolyte achieved a conversion efficiency of 5.29% under AM 1.5 simulated solar light irradiation (100 mW cm−2). The side-chain imidazolium π-π stacking in PEAI played a key role in the holes transport from the photoanode to the counter electrode. Both the open-circuit voltage and short-circuit current density showed decreases with the increase in the content of iodine in PEAI electrolyte. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013