Near-IR femtosecond transient absorption spectroscopy of ultrafast polaron and triplet exciton formation in polythiophene films with different regioregularities.

@article{Guo2009NearIRFT,
  title={Near-IR femtosecond transient absorption spectroscopy of ultrafast polaron and triplet exciton formation in polythiophene films with different regioregularities.},
  author={Jiamo Guo and Hideo Ohkita and Hiroaki Benten and Shinzaburo Ito},
  journal={Journal of the American Chemical Society},
  year={2009},
  volume={131 46},
  pages={16869-80}
}
The formation dynamics of polaron pairs, polarons, and triplet excitons in regiorandom and regioregular poly(3-hexylthiophene) (RRa-P3HT and RR-P3HT) films was comprehensively studied by transient absorption spectroscopy over the wide wavelength region from 500 to 1650 nm under various excitation intensities. In both RRa-P3HT and RR-P3HT films, polaron pairs were generated not from relaxed singlet exciton states but from hot excitons on a time scale of <100 fs and decayed monomolecularly by… CONTINUE READING
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