Electrochromic properties as a function of electrolyte on the performance of electrochromic devices consisting of a single-layer polymer |
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| Institution: | 1. Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, Storrs, CT 06269, USA;2. The Polymer Program, University of Connecticut, 97 N. Eagleville Road, Storrs, CT 06269, USA;3. Department of Physics, University of Connecticut, 2152 Hillside Road, Storrs, CT 06269, USA;1. Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan;2. Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan;1. IK4-CIDETEC, Paseo Miramon 196, E-20014 Donostia-San Sebastian, Spain;2. Maier Technology Centre, Polígono Industrial Arabieta, 48300 Gernika, Spain;1. Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan;2. Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan;1. School of Materials Science and Engineering, Zhengzhou University, Henan 450001, PR China;2. Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China |
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| Abstract: | Herein, a study on varying salts and their composition used in the gel electrolyte for a one-step lamination assembly procedure for electrochromic devices was carried out to explore their effects on various electrochromic performance parameters, such as color uniformity, photopic contrast, switching speed, and optical memory. Electrochromic polymers formed in different gel electrolyte compositions are highly dependent on the type, amount, and composition of salt used. The following groups of salts were investigated: ionic liquids, ammonium salts, and lithium salts. The lithium salts yielded devices with the best color uniformity, photopic contrast as high as 48%, and switching response speeds as low as 1 s for 5.5 cm2 devices using the electroactive monomer 2,2-dimethyl-3,4-propylenedioxythiophene (ProDOT-Me2) to generate the electrochromic polymer. Hermetically sealed electrochromic devices exhibited optical memory of 27 h for a 2% photopic transmittance loss under normal laboratory conditions, and a 171 cm2 electrochromic device was demonstrated. |
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| Keywords: | Electropolymerization Electrochromic Conjugated polymer Electrochromic devices Displays Windows |
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