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New Roll‐to‐Roll Processable PEDOT‐Based Polymer with Colorless Bleached State for Flexible Electrochromic Devices
Author(s) -
Macher Sven,
Schott Marco,
Sassi Mauro,
Facchinetti Irene,
Ruffo Riccardo,
Patriarca Giorgio,
Beverina Luca,
Posset Uwe,
Giffin Guinevere A.,
Löbmann Peer
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201906254
Subject(s) - electrochromism , materials science , polymer , thin film , pedot:pss , electrochromic devices , transmittance , polymerization , optoelectronics , chemical engineering , photochemistry , nanotechnology , electrode , composite material , chemistry , engineering
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, Δτ v = 59% (Δ L* = 54.1), contrast ratio (CR = 15.8), coloration efficiency (η = 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 Δτ v = 47% (Δ L* = 51.9) and a neutral‐colored bleached state is developed.