Microstructure and Optoelectronic Properties of P3HT-b-P4VP/PCBM Blends: Impact of PCBM on the Copolymer Self-Assembly

Abstract : Block copolymers have been widely investigated over the past decades for their ability to microphase separate into well-defined nanostructured thin films with tailored physical properties. The aim of the present study is to investigate the thin film properties of rod coil block copolymer/phenyl-C-61-butyric acid methyl ester (PCBM) blends as a function of the blend weight ratio, using a copolymer which is based on a poly(3-hexylthiophene) (P3HT) rod block and poly(4-vinylpyridine) (P4VP) coil block. Atomic force microscopy, transmission electron microscopy and grazing incidence X-ray diffraction analysis are used to study the influence of PCBM on the copolymer self-assembling. UV-visible absorption and photoluminescence spectroscopies as well as field-effect mobility measurements are performed in order to get further insight into the blend optoelectronic properties. It is found that the block copolymer phase-separated morphology and charge carrier mobilities strongly depend on the PCBM loading and thermal annealing. In particular, the results point out that PCBM enhances the block copolymer microphase separation within a narrow range of the polymer:PCBM weight ratio. In addition, clear evidence for PCBM accumulation within the P4VP domains is found by monitoring the P3HT fluorescence and charge carrier mobilities.
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Macromolecules, American Chemical Society, 2013, 46 (22), pp.8824-8831. 〈10.1021/ma4010692〉
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https://hal.archives-ouvertes.fr/hal-00926332
Contributeur : Dominique Richard <>
Soumis le : jeudi 9 janvier 2014 - 14:33:50
Dernière modification le : vendredi 19 octobre 2018 - 11:46:41

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Véronique Gernigon, Patrick Leveque, Fanny Richard, Nicolas Leclerc, Cyril Brochon, et al.. Microstructure and Optoelectronic Properties of P3HT-b-P4VP/PCBM Blends: Impact of PCBM on the Copolymer Self-Assembly. Macromolecules, American Chemical Society, 2013, 46 (22), pp.8824-8831. 〈10.1021/ma4010692〉. 〈hal-00926332〉

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