A novel composite polymer electrolyte containing room-temperature ionic liquids and heteropolyacids for dye-sensitized solar cells |
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Authors: | Da Chen Qian Zhang Geng Wang Hao Zhang Jinghong Li |
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Institution: | aDepartment of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China;bDepartment of Chemistry, Key Lab of Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing 100084, China |
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Abstract: | A novel composite polymeric gel comprising room-temperature ionic liquids (1-butyl-3-methyl-imidazolium-hexafluorophosphate, BMImPF6) and heteropolyacids (phosphotungstic acid, PWA) in poly(2-hydroxyethyl methacrylate) matrix was successfully prepared and employed as a quasi-solid state electrolyte in dye-sensitized solar cells (DSSCs). These composite polymer electrolytes offered specific benefits over the ionic liquids and heteropolyacids, which effectively enhanced the ionic conductivity of the composite polymer electrolyte. Unsealed devices employing the composite polymer electrolyte with the 3% content of PWA achieved the solar to electrical energy conversion efficiency of 1.68% under irradiation of 50 mW cm−2 light intensity, increasing by a factor of more than three compared to a DSSC with the blank BMImPF6-based polymer electrolyte without PWA. It is expected that these composite polymer electrolytes are an attractive alternative to previously reported hole transporting materials for the fabrication of the long-term stable quasi-solid state or solid state DSSCs. |
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Keywords: | Room-temperature ionic liquid Heteropolyacid Composite polymer electrolyte Ionic conductivity Dye-sensitized solar cells |
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