New Liquid Crystal-Embedded PVdF-co-HFP-Based Polymer Electrolytes for Dye-Sensitized Solar Cell Applications

作者：Vijayakumar G; Lee Meyoung Jin; Song Myungkwan; Jin Sung Ho; Lee Jae Wook; Lee Chan Woo; Gal Yeong Soon; Shim Hyo Jin; Kang Yongku; Lee Gi Won; Kim Kyungkon; Park Nam Gyu; Kim Suhkmann

来源：Macromolecular Research, 2009, 17(12): 963-968.

DOI：10.1007/bf03218643

• liquid crystal
• PVdF-co-HFP
• polymer electrolyte
• dye-sensitized solar cells
• photovoltaic performance

Liquid crystal (LC; E7 and/or ML-0249)-embedded, poly(vinylidenefluoride-co-hexafluoropropylene) (PVdF-co-HFP)-based, polymer electrolytes were prepared for use in dye-sensitized solar cells (DSSCs). The electrolytes contained 1-methyl-3-propylimidazolium iodide (PMII), tetrabutylammonium iodide (TBAI), and iodine (I(2)), which participate in the I(3)(-)/I(-) redox couple. The incorporation of photochemically stable PVdF-co-HFP in the DSSCs created a stable polymer electrolyte that resisted leakage and volatilization. DSSCs, with liquid crystal (LC)embedded PVdF-co-HFP-based polymer electrolytes between the amphiphilic ruthenium dye N719 absorbed to the nanocrystalline TiO(2) photoanode and the Pt counter electrode, were fabricated. These DSSCs displayed enhanced redox couple reduction and reduced charge recombination in comparison to that fabricated from the conventional PVdF-co-HFP-based polymer electrolyte. The behavior of the polymer electrolyte was improved by the addition of optimized amounts of plasticizers, such as ethylene carbonate (EC) and propylene carbonate (PC). The significantly increased short-circuit current density (J(sc), 14.60 mA/cm(2)) and open-circuit voltage (V(oc), 0.68 V) of these DSSCs led to a high power conversion efficiency (PCE) of 6.42% and a fill factor of 0.65 under a standard light intensity of 100 mW/cm(2) irradiation of AM 1.5 sunlight. A DSSC fabricated by using E7-embedded PVdF-co-HFP-based polymer electrolyte exhibited a maximum incident photon-to-current conversion efficiency (IPCE) of 50%.

• 出版日期2009-12