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  4. New Roll‐to‐Roll Processable PEDOT‐Based Polymer with Colorless Bleached State for Flexible Electrochromic Devices
 
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2020
Zeitschriftenaufsatz
Titel

New Roll‐to‐Roll Processable PEDOT‐Based Polymer with Colorless Bleached State for Flexible Electrochromic Devices

Abstract
Conjugated electrochromic (EC) polymers for flexible EC devices (ECDs) generally lack a fully colorless bleached state. A strategy to overcome this drawback is the implementation of a new sidechain-modified poly(3,4-ethylene dioxythiophene) derivative that can be deposited in thin-film form in a customized high-throughput and large-area roll-to-roll polymerization process. The sidechain modification provides enhanced EC properties in terms of visible light transmittance change, Dtv = 59% (DL* = 54.1), contrast ratio (CR = 15.8), coloration efficiency (i = 530 cm² C−1), and color neutrality (L* = 83.8, a* = −4.3, b* = −4.1) in the bleached state. The intense blue-colored polymer thin films exhibit high cycle stability (10 000 cycles) and fast response times. The design, synthesis, and polymerization of the modified 3,4-ethylene dioxythiophene derivative are discussed along with a detailed optical, electrochemical, and spectroelectrochemical characterization of the resulting EC thin films. Finally, a flexible see-through ECD with a visible light transmittance change of Dtv = 47% (DL* = 51.9) and a neutral-colored bleached state is developed.
Author(s)
Macher, Sven
Fraunhofer-Institut für Silicatforschung ISC
Schott, Marco
Fraunhofer-Institut für Silicatforschung ISC
Sassi, Mauro
Facchinetti, Irene
Ruffo, Riccardo
Patriarca, Giorgio
Beverina, Luca
Posset, Uwe
Fraunhofer-Institut für Silicatforschung ISC
Giffin, Guinevere A.
Fraunhofer-Institut für Silicatforschung ISC
Löbmann, Peer
Fraunhofer-Institut für Silicatforschung ISC
Zeitschrift
Advanced Functional Materials
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DOI
10.1002/adfm.201906254
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Language
Englisch
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ISC
Tags
  • electrochromic polyme...

  • electrochromism

  • flexible electrochrom...

  • PEDOT

  • roll-to-roll coating

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