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• W2902744724 abstract "The nature of polaron formation has profound implications on the transport of charge carriers in conjugated polymers, but still remains poorly understood. Here, we develop in situ electrochemical resonant Raman spectroscopy, a powerful structural probe that allows direct observation of polaron formation. We report that polaron formation in ordered poly(3-hexyl)thiophene (P3HT) polymer domains (crystalline phase) results in less pronounced changes in molecular conformation, indicating smaller lattice relaxation, compared to polarons generated in disordered polymer domains (amorphous phase) for which we observe large molecular conformational changes. These conformational changes are directly related to the effective conjugation length of the polymer. Furthermore, we elucidate how blending the P3HT polymer with phenyl C-61 butyric acid methyl ester affects polaron formation in the polymer. We find that blending disturbs polymer crystallinity, reducing the density of polarons that can form upon charge injection at the same potential, while the lost capacity is partly restored during postdeposition thermal annealing. Our study provides direct spectroscopic evidence for a lower degree of lattice reorganization in crystalline (and therefore more planar) polymers than in conformationally disordered polymers. This observation is consistent with higher charge carrier mobility and better device performance commonly found in crystalline polymer materials." @default.
• W2902744724 created "2018-12-11" @default.
• W2902744724 creator A5012963037 @default.
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• W2902744724 date "2018-12-05" @default.
• W2902744724 modified "2023-10-16" @default.
• W2902744724 title "Impact of Molecular Order on Polaron Formation in Conjugated Polymers" @default.
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• W2902744724 doi "https://doi.org/10.1021/acs.jpcc.8b09706" @default.
• W2902744724 hasPublicationYear "2018" @default.
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