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

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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
Volume64
Issue number19
Publication statusPublished - Nov 15 2001

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Polarons
Hot carriers
polarons
Excitons
excitons
Gene Conversion
probes
Photoexcitation
photoexcitation
Absorption spectroscopy
Polymers
absorption spectroscopy
Polarization
Wavelength
shift
polymers
decay
polarization
wavelengths
LDS 751

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Femtosecond transient absorption study of oriented poly(9,9-dioctylfluorene) film : Hot carriers, excitons, and charged polarons. / Xu, S.; Klimov, Victor I; Kraabel, B.; Wang, H.; McBranch, D. W.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 64, No. 19, 193201, 15.11.2001, p. 1932011-1932014.

Research output: Contribution to journalArticle

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