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Ultrafast photogeneration of inter-chain charge pairs in polythiophene films
Univ Lund, Dept Phys Chem, S-22100 Lund, Sweden Inst Phys, LT-2600 Vilnius, Lithuania Linkoping Univ, IFM, Dept Phys, S-58183 Linkoping, Sweden Chalmers Univ Technol, Dept Polymer Technol, S-41296 Gothenburg, Sweden Univ Trieste, Dipartimento Sci Farmaceut, I-34127 Trieste, Italy.
Univ Lund, Dept Phys Chem, S-22100 Lund, Sweden Inst Phys, LT-2600 Vilnius, Lithuania Linkoping Univ, IFM, Dept Phys, S-58183 Linkoping, Sweden Chalmers Univ Technol, Dept Polymer Technol, S-41296 Gothenburg, Sweden Univ Trieste, Dipartimento Sci Farmaceut, I-34127 Trieste, Italy.
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2000 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 322, no 1-2, 136-142 p.Article in journal (Refereed) Published
Abstract [en]

Photoexcitation dynamics in films of polythiophenes with different side groups were studied by transient absorption spectroscopy using 80 fs pulses. We show that inter-chain charge pairs (CP) are generated with similar to 20% efficiency in a polymer with short inter-chain distance (similar to 4 Angstrom) within 100 fs after photoexcitation. We discuss two mechanisms for inter-chain charge separation: (i) electron or hole transfer from an initially excited intra-chain singlet state or (ii) optical excitation of mixed exciton-charge transfer states, which quickly evolve to inter-chain CPs. (C) 2000 Elsevier Science B.V, All rights reserved.

Place, publisher, year, edition, pages
2000. Vol. 322, no 1-2, 136-142 p.
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Engineering and Technology
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URN: urn:nbn:se:liu:diva-49757OAI: oai:DiVA.org:liu-49757DiVA: diva2:270653
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12

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Inganäs, Olle

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