An all-thiophene electrochromic device fabricated with poly(3-methylthiophene) and poly(3,4-ethylenedioxythiophene) |
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Authors: | Shih-Wen Huang Kuo-Chuan Ho |
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Affiliation: | aDepartment of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan;bInstitute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan |
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Abstract: | A novel all-organic electrochromic device (ECD) is presented. By electrodepositing poly(3-methylthiophene) (PMeT) in boron fluoride ethyl ether (BFEE), a strong Lewis acid, a good-quality PMeT film was obtained. On the basis of studies of PMeT, it can be regarded as a pseudo-anodic coloring material for ECDs. On the other hand, poly(3,4-ethylenedioxythiophene) (PEDOT) is an ideal cathodic coloring electrochromic material known for its high optical contrast, long-term stability, and high coloration efficiency. By combining these two thiophene derivatives, the application potential of this device was determined. The color of the ECD switches between deep blue at −1.4 V (PEDOT vs. PMeT) and light red at 0.6 V. The device exhibits stable electrochromic performance, with a maximum optical attenuation (ΔTmax) at 655 nm reaching 46% (from 9% to 55%), and achieves a high coloration efficiency of 336 cm2/C. After 100 repeated cycles, the cell still retained at 91.3% of its ΔTmax at 655 nm. |
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Keywords: | Coloration efficiency Cycling stability Electrochromic device Poly(3,4-ethylenedioxythiophene) Poly(3-methylthiophene) |
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