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Phosphonium‐based polythiophene conjugated polyelectrolytes with different surfactant counterions: thermal properties, self‐assembly and photovoltaic performances

Abstract : Phosphonium-based polythiophene conjugated polyelectrolytes (CPEs) with three different counterions (dodecylsulfate, octylsulfate and perfluorooctane sulfonate) are synthesized to determine how the nature of the counterion affects the thermal properties, the self-assembly in thin films and the performance as the cathode interfacial layer in polymer solar cells (PSCs). The counterion has a significant effect on the thermal properties of the CPEs, affecting both their glass transition and crystalline behaviour. Grazing-incidence wide-angle X-ray scattering studies also indicate that changing the nature of the counterion influences the microstructural organization in thin films (face-on versus edge-on orientation). The affinity of the CPEs with the underlying photoactive layer in PSCs is highly correlated with the counterion species. Finally, in addition to an increase of the power conversion efficiency of ca 15% when using these CPEs as cathode interfacial layers in PSCs, a higher device stability is noted, compared to a reference device with a calcium interlayer.
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https://hal.archives-ouvertes.fr/hal-02999757
Contributor : Sylvain Chambon <>
Submitted on : Friday, November 13, 2020 - 2:22:21 AM
Last modification on : Tuesday, November 24, 2020 - 10:19:49 AM

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Michèle Chevrier, Jurgen Kesters, Judith Houston, Niko van den Brande, Sylvain Chambon, et al.. Phosphonium‐based polythiophene conjugated polyelectrolytes with different surfactant counterions: thermal properties, self‐assembly and photovoltaic performances. Polymer International, Wiley, 2020, ⟨10.1002/pi.6088⟩. ⟨hal-02999757⟩

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