Ultrafast photogeneration of inter-chain charge pairs in polythiophene films
2000 (English)In: Chemical Physics Letters, ISSN 0009-2614, Vol. 322, no 1-2, 136-142 p.Article in journal (Refereed) Published
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.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-49757OAI: oai:DiVA.org:liu-49757DiVA: diva2:270653