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Ultrafast light-induced charge pair formation dynamics in poly[3-(2'-methoxy-5' octylphenyl)thiophene]
Department of Chemical Physics, Lund University, P.O. Box 124, SE-22100 Lund, Sweden.
Institute of Physics, Savanoriu 231, LT-02300, Vilnius, Lithuania.
Department of Chemical Physics, Lund University, P.O. Box 124, SE-22100 Lund, Sweden.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics.
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2004 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 70, no 7Article in journal (Refereed) Published
Abstract [en]

Charge pair photogeneration was investigated by ultrafast absorption spectroscopy for different excitation photon energies in poly[3-(2'- methoxy-5' octylphenyl)thiophene] (POMeOPT) film with and without an external electric field. Electric field-assisted charge pair photogeneration in POMeOPT occurs from vibrationally relaxed singlet excitons during their entire lifetime and charge pair formation takes place in this manner even in the absence of an external electric field. From our data there are no indications of hot exciton dissociation to charge pairs even when a large amount of excess energy is supplied to the excitons. To explain these observations we present a model with energy transfer to low-barrier dissociation sites as a key feature.

Place, publisher, year, edition, pages
2004. Vol. 70, no 7
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Engineering and Technology
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URN: urn:nbn:se:liu:diva-45677DOI: 10.1103/PhysRevB.70.075202OAI: oai:DiVA.org:liu-45677DiVA: diva2:266573
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Zhang, FenglingInganäs, Olle

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