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, Δτv = 59% (ΔL* = 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 Δτv = 47% (ΔL* = 51.9) and a neutral-colored bleached state is developed.

Macher, S., Schott, M., Sassi, M., Facchinetti, I., Ruffo, R., Patriarca, G., et al. (2020). New Roll-to-Roll Processable PEDOT-Based Polymer with Colorless Bleached State for Flexible Electrochromic Devices. ADVANCED FUNCTIONAL MATERIALS, 30(6) [10.1002/adfm.201906254].

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

Sassi, M;Facchinetti, I;Ruffo, R;Patriarca, G;Beverina, L;
2020

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, Δτv = 59% (ΔL* = 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 Δτv = 47% (ΔL* = 51.9) and a neutral-colored bleached state is developed.
Articolo in rivista - Articolo scientifico
electrochromic polymers, electrochromism, flexible electrochromic devices, PEDOT, roll‐to‐roll coating
English
11-nov-2019
2020
30
6
1906254
open
Macher, S., Schott, M., Sassi, M., Facchinetti, I., Ruffo, R., Patriarca, G., et al. (2020). New Roll-to-Roll Processable PEDOT-Based Polymer with Colorless Bleached State for Flexible Electrochromic Devices. ADVANCED FUNCTIONAL MATERIALS, 30(6) [10.1002/adfm.201906254].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/255032
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