Physics – Condensed Matter – Materials Science
Scientific paper
2007-02-27
Phys. Rev. Lett. 98, 206406 (2007)
Physics
Condensed Matter
Materials Science
10 pages, 4 figures, published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.98.206406
We address the role of excitonic coulping on the nature of photoexcitations in the conjugated polymer regioregular poly(3-hexylthiophene). By means of temperature-dependent absorption and photoluminescence spectroscopy, we show that optical emission is overwhelmingly dominated by weakly coupled H-aggregates. The relative absorbance of the 0-0 and 0-1 vibronic peaks provides a powerfully simple means to extract the magnitude of the intermolecular coupling energy, approximately 5 and 30 meV for films spun from isodurene and chloroform solutions respectively.
Clark Jenny
Friend Richard H.
Silva Carlos
Spano Frank C.
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