Morphology dependent exciton formation in regioregular poly(3‐alkyl)thiophenes
Autor: | Mitsuru Sugisaki, Motoaki Yasui, Daisuke Kosumi, Katsuichi Kanemoto, Hideki Hashimoto, Tsutomu Karasawa |
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Rok vydání: | 2010 |
Předmět: | |
Zdroj: | physica status solidi c. 8:88-91 |
ISSN: | 1610-1642 1862-6351 |
Popis: | The photophysics of the regioregular (RR) poly(3-alkylthiophene) (P3AT) films is investigated by cw-photoinduced absorption (PIA) measurements based on bleaching signals. The photoexcitation intensity dependence of the cw-PIA signals demonstrates that both photogenerated localized and delocalized polarons obey a bimolecular recombination process under cw photoexcitation. It is demonstrated that the lineshape of cw-PIA bleaching spectra for the P3AT films varies with the length of the alkyl substituents of P3AT. The bleaching spectra reveal a trend that the electron-phonon couplings of final exciton migration sites become strong with increasing the interlamella distance in the P3AT film. This indicates that interlamella couplings affect the electron-phonon couplings of the migration sites locating at two-dimensional lamellas. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
Databáze: | OpenAIRE |
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