The Use of Ionic Liquid for Dye-Sensitized Solar Cells pp. 173-202
Authors: (Chuan-Pei Lee, Kuo-Chuan Ho, Department of Chemical Engineering and others)
Abstract: This chapter mainly deals with the topic of ionic liquids (ILs) for the use as the electrolyte in dye-sensitized solar cells (DSSCs). A brief review on five strategies of using ILs for improving the performance or durability in DSSCs will be introduced. Firstly, the application of molten salts, triethylamine hydroiodide (THI) and
tetraethylammonium iodide (TEAI), as supporting electrolytes were synthesized and investigated for the DSSCs. Optimum cell efficiency (η) of 8.45% were obtained for the DSSC containing 0.5 M of THI/0.05 M iodine (I2)/0.5 M 4-tert-butylpyridine (TBP) in acetonitrile (ACN). In the second strategy, binary ILs of imidazolium salts containing
different cations and anions were used as electrolytes in quasi-solid-state DSSCs, and their physicochemical properties were also studied on the cell performances. The DSSC with a binary ILs electrolyte reaches an η of 4.11% and shows a superior long-term
stability. As the third strategy, gel-type DSSCs were fabricated with ILs electrolyte containing poly-1,1′-(methylenedi 4,1-phenylene) bismaleimide (PBMI) prepared by in situ polymerization of the corresponding monomer without an initiator at 30 °C.