11 July 2002 Enhanced contrast ratios and rapid-switching color-changeable devices based on poly(3,4-propylenedioxythiophene) derivative and counterelectrode
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Abstract
A large contrast ratio and rapid switching electrochromic(EC) polymer device which consists of laminated two-layer structure between two electrodes was proposed. The new design which only comprises an ITO coated glass electrode, a cathodic poly(3,4-propylenedioxythiophene) derivative (PProDOT-(CH3$2) EC polymer film, a solid electrolyte and an Au-based counterelectrode which replaces anodic EC polymer and ITO electrode. Carbon-based counterelectrode was prepared for comparing with Au-based counterelectrode. Lithography and sputtering were used for Au patterning on glass substrate, while screen printing was used for carbon-based counterelectrode. Covering percentage of Au is less than 20%, in order to keep the electrode high transmittance. We also prepared a solid electrolyte, such as poly(methyl metracrylate)(PMMA) based containing LiClO4 gel electrolyte for solid state applications. A special parafilm was utilized on sealing the assembly device. Color change of high contrast ratio of transmittance (>(Delta) 50% T) of the device is rapidly (0.5-1s) obtained upon applied 2.5V voltage and repeatable (10,000 times). The temperature range under which the switching is stable is wide, -40 degree(s)C ~ 100 degree(s)C. The repeatability of current of EC polymer devices while color change was estimated by electrochemistry.
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Chunye Xu, Hirohisa Tamagawa, Mikio Uchida, Minoru Taya, "Enhanced contrast ratios and rapid-switching color-changeable devices based on poly(3,4-propylenedioxythiophene) derivative and counterelectrode", Proc. SPIE 4695, Smart Structures and Materials 2002: Electroactive Polymer Actuators and Devices (EAPAD), (11 July 2002); doi: 10.1117/12.475192; https://doi.org/10.1117/12.475192
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