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 language | English |
|---|---|
| Article number | 193201 |
| Pages (from-to) | 1932011-1932014 |
| Number of pages | 4 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 64 |
| Issue number | 19 |
| Publication status | Published - Nov 15 2001 |
ASJC Scopus subject areas
- Condensed Matter Physics
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Xu, S., Klimov, V. I., Kraabel, B., Wang, H., & McBranch, D. W. (2001). Femtosecond transient absorption study of oriented poly(9,9-dioctylfluorene) film: Hot carriers, excitons, and charged polarons. Physical Review B - Condensed Matter and Materials Physics, 64(19), 1932011-1932014. [193201].