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Theses

Conjugated polymer blends for faster organic mixed ionic-electronic conductors

Abstract : The operation of various organic electrochemical devices relies on the intrinsic mixed conducting properties of π-conjugated polymers. One key factor that generally limits device performance is the slow transport of ions throughout the semiconducting polymer, necessary for bulk doping and de-doping. Thus, there has been increasing efforts to enhance the ionic conductivity of various conjugated polymers by chemically engineering the polarity of the side chains of the material. Such substituents however can impact the structure of these materials and render their electronic properties sensitive to environmental conditions. This work demonstrates the viability of multicomponent polymer blending as an alternative approach to tune mixed conductivity. A hydrophilic block copolymer of poly(3-hexylthiophene) and poly(ethylene oxide) (P3HT-b-PEO) is blended with a mixed conducting random copolymer of P3HT and poly(3-hydroxyhexylthiophene) (P3HT-co-P3HHT). Electrochemical transistors of the blends exhibit similar transduction performance at steady state relative to those of the neat P3HT-co-P3HHT, however the response time is greatly reduced. We attribute this to faster electrochemical doping related to ion uptake due to the increased material hydrophilicity upon adding the block copolymer. Meanwhile, the P3HT-moiety of the block copolymer seems to act as a compatibilizer that can support the structural stability of the blend, which can subsequently support the operational stability of resulting devices. Thus, our work implies that engineering block copolymers to fabricate compatible blends is a promising method to enhance the performance and stability of mixed conducting materials.
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https://tel.archives-ouvertes.fr/tel-03537553
Contributor : Abes Star :  Contact
Submitted on : Thursday, January 20, 2022 - 2:38:10 PM
Last modification on : Monday, March 28, 2022 - 1:02:06 PM
Long-term archiving on: : Thursday, April 21, 2022 - 7:09:07 PM

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BARKER_MICAH_2021.pdf
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  • HAL Id : tel-03537553, version 1

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Micah Barker. Conjugated polymer blends for faster organic mixed ionic-electronic conductors. Other. Université de Bordeaux, 2021. English. ⟨NNT : 2021BORD0401⟩. ⟨tel-03537553⟩

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