Femtosecond transient absorption study of oriented poly(9,9-dioctylfluorene) film: Hot carriers, excitons, and charged polarons

S. Xu, Victor I Klimov, B. Kraabel, H. Wang, D. W. McBranch

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We present a transient absorption spectroscopy study of oriented poly(9,9-dioctylfluorene) film. By comparing the spectral features and dynamics at different wavelengths using different probe polarizations, we conclude that three species are generated after the photoexcitation: hot carriers, excitons, and charged polarons. The charged polaron spectrum is measured with the probe beam polarized perpendicular to the polymer chains, and two bands are recognized. In addition, a new band in mid-IR regime is observed that decays faster than excitons, and whose peak shifts in time. This feature is assigned to hot carriers.

Original languageEnglish
Article number193201
Pages (from-to)1932011-1932014
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number19
Publication statusPublished - Nov 15 2001


ASJC Scopus subject areas

  • Condensed Matter Physics

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