Optical excitations of poly(3-butylthiophene) and high electron affinity substituted poly(3-butylthiophene)

We have characterized the long lived photoexcitations in thin films of poly(3-butylthiophene) [PBT] and co-polymers made of PBT and acceptor substituted PBT, using photo-induced absorption (PA) and optically detected magnetic resonance PA (PADMR) spectroscopies. The PA spectra reveal two main absorp...

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Bibliographic Details
Published in:Synthetic metals 1995-03, Vol.69 (1), p.321-324
Main Authors: Greenwald, Y., Wei, X., Jeglinski, S., Poplawski, J., Ehrenfreund, E., Speiser, S., Vardeny, Z.V.
Format: Article
Language:English
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Summary:We have characterized the long lived photoexcitations in thin films of poly(3-butylthiophene) [PBT] and co-polymers made of PBT and acceptor substituted PBT, using photo-induced absorption (PA) and optically detected magnetic resonance PA (PADMR) spectroscopies. The PA spectra reveal two main absorption bands; one at 1.4-1.7 eV, which is composed of contributions from both S=1 and S= 1 2 species, and another at 0.5 eV which is due to S= 1 2 charged species. Our results are explained within a picture where the S=1 species are triplet excitons and the S= 1 2 species are photogenerated polarons.
ISSN:0379-6779
1879-3290
DOI:10.1016/0379-6779(94)02469-F