New liquid crystal-embedded PVdF-co-HFP-based polymer electrolytes for dye-sensitized solar cell applications

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

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Liquid crystal (LC; E7 and/or ML-0249)-embedded, poly(vinylidenefluoride- co-hexaftuoropropylene) (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 (I2), which participate in the I3/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 TiO2 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 (Jsc, 14.60 mA/cm 2) and open-circuit voltage (Voc, 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/cm2 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%.

Original languageEnglish
Pages (from-to)963-968
Number of pages6
JournalMacromolecular Research
Volume17
Issue number12
DOIs
StatePublished - Dec 2009

Keywords

  • Dye-sensitized solar cells
  • Liquid crystal
  • PVdF-co-HFP
  • Photovoltaic performance
  • Polymer electrolyte

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