A novel ionic liq. crystal (ILC) system, C12MImI/I2, with a smectic A phase was used as an electrolyte for a dye-sensitized solar cell (DSSC) - it had a higher short-circuit c.d. (JSC) and better light-to-electricity conversion efficiency than the system using a non-liq. cryst. ionic liq., C11MImI/I2, due to the higher cond. of ILC. To study charge transport properties of the electrolytes, the exchange reaction-based diffusion coeffs., Dex, were evaluated. The larger Dex value of ILC indicated that the higher cond. of ILC is attributed to the enhancement of the exchange reaction between iodide species. As a result of formation of the 2-dimensional electron conductive pathways organized by the localized I3- and I- at SA layers, the concn. of polyiodide species exemplified by Im- (m = 5, 7, ...) was higher in C12MImI/I2. However, as the increment of the concn. of polyiodide species is less than that of Dex, the contribution of a 2-dimensional structure of the conductive pathway, through the increase of collision frequency between iodide species, is proposed. A quasi-solid-state ionic liq. crystal DSSC was fabricated by employing a low mol. gelator. Addn. of the 5.0 g/L gelator to ILC improved light-to-electricity conversion efficiency through the increase of JSC due to the enhancement of the cond. in the C12MImI/I2-gel.
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