Ultrafast photogeneration of inter-chain charge pairs in polythiophene films

A Ruseckas, M Theander, MR Andersson, M Svensson, M Prato, O Inganas, Sundstrom

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)136-142
Number of pages7
JournalChemical Physics Letters
Volume322
Issue number1-2
Publication statusPublished - 12 May 2000

Keywords

  • LIGHT-EMITTING-DIODES
  • CONJUGATED POLYMERS
  • SUBSTITUTED POLYTHIOPHENES
  • POLARON PAIRS
  • PHOTOLUMINESCENCE
  • LUMINESCENCE
  • PHOTOPHYSICS
  • DERIVATIVES
  • COMPOSITES
  • ELECTRON

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