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11 September 2013 Long-lived photoexcitations in intercalated, partially and predominantly non-intercalated polymer:fullerene blends
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Abstract
In this work, we study the nature of long-lived photoexcitations in intercalated, partially and predominantly non-intercalated semicrystalline poly(2,5-bis(3-tetradecyl-thiophen-2-yl)thieno [3,2,-b]thiophene) (pBTTT):phenyl-C61 -butyric acid methyl ester (PC61BM) blend films by quasi-steady-state photoinduced absorption (PIA) spectroscopy. We find that polarons are generated in these microstructures. However, the polarons generated in partially and predominantly non-intercalated films (1.7 eV) are at higher energy than in intercalated film (1.4 eV). After comparing with the polaron generation in neat pBTTT polymer film, we propose that the polarons generated in partially and predominantly non-intercalated film are delocalized charges, and the polarons generated in intercalated film are localized charges. Furthermore, we also find that the polarons generated in the partially non-intercalated film have the longest lifetime.
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Fei Dou, Ester Buchaca-Domingo, Maciej Sakowicz, Xinping Zhang, Natalie Stingelin, and Carlos Silva "Long-lived photoexcitations in intercalated, partially and predominantly non-intercalated polymer:fullerene blends", Proc. SPIE 8811, Physical Chemistry of Interfaces and Nanomaterials XII, 88111J (11 September 2013); https://doi.org/10.1117/12.2026147
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