Fast Switching ITO Free Electrochromic Devices |
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Authors: | Jacob Jensen Markus Hösel Inyoung Kim Jong‐Su Yu Jeongdai Jo Frederik C Krebs |
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Affiliation: | 1. Department of Energy Conversion and Storage, Technical University of Denmark, Roskilde, Denmark;2. Department of Printed Electronics, Korea Institute of Machinery and Materials, Daejeon, Korea |
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Abstract: | Indium‐doped tin oxide free electrochromic devices are prepared by coating electrochromic polymers onto polyethylene terephthalate substrates encompassing two different silver grids as electrodes. One design comprises a flexoprinted highly conductive silver grid electrode, yielding electrochromic devices with a response time of 2 s for an optical contrast of 27%. The other design utilizes an embedded silver grid electrode whereupon response times of 0.5 s for a 30% optical contrast are realized when oxidizing the device. A commercially available conductive poly(3,4‐ethylenedioxythiophene):poly(4‐styrenesulfonate acid) formulation (PEDOT:PSS) is coated onto the silver grids as a charge balancing polymer, and is in this setting found to be superior to a polypyrrole previously employed in electrochromic devices. In addition, the PEDOT:PSS layer increases the conductivity in the hexagonal grid structure. |
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Keywords: | electrochromic polymers electrochromic devices PEDOT:PSS silver grid electrodes ITO free |
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