Pang H.-W.Yu H.-F.Huang Y.-J.Li C.-T.Ho K.-C.2019-05-172019-05-17201820507488https://scholars.lib.ntu.edu.tw/handle/123456789/408667Three novel polymeric ionic liquids (PILs), denoted as PFII-F, PFII-E, and PFII-S, are successfully synthesized by grafting different molar ratios (one-fourth, one eighth, and one sixteenth, respectively) of 1-butylimidazolium iodide onto poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). These PFII PILs are fabricated as polymer membranes via a simple electrospinning technique, which are used as the electrolyte for quasi-solid-state (QSS) dye-sensitized solar cells (DSSCs). The PFII membranes have multiple functions including: (1) encapsulation of the liquid electrolyte with good charge transfer and ionic conductivity properties, (2) chelation of Li + through the lone pair electrons on their fluoride atoms, and (3) filling the dye-uncovered TiO 2 surface with their imidazolium segment. Function (1) endows DSSCs with prominent long-term stability, while functions (2) and (3) suppress the dark current. The best QSS-DSSC with the PFII-F membrane shows a larger open-circuit voltage (V OC ), comparable short-circuit current density (J SC ), better power conversion efficiency (£b) of 9.26%, and superior long-term stability (up to 97% of its initial £b) over 1500 h compared to the cell with standard liquid electrolyte (8.63%). ? 2018 The Royal Society of Chemistry.[SDGs]SDG7journal article10.1039/c8ta01215f2-s2.0-85050571391https://www.scopus.com/inward/record.uri?eid=2-s2.0-85050571391&doi=10.1039%2fc8ta01215f&partnerID=40&md5=72674b2e06d2f977f37e57bb609760b8