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Charge carrier photogeneration and recombination in ladder-type poly(para-phenylene): Interplay between impurities and external electric field

Gulbinas, V.; Hertel, D.; Yartsev, Arkady LU and Sundström, Villy LU (2007) In Physical Review B (Condensed Matter and Materials Physics) 76(23).
Abstract
Charge carrier generation and decay in m-LPPP polymer films were examined by means of femtosecond transient absorption spectroscopy in the time window of 100 fs-15 ns. Two modes of polaron formation with distinct behavior were identified, impurity induced in the absence of an external electric field and electric field induced in pristine film. While field induced charge generation is relatively slow, occurring throughout the excited state lifetime, the rate of impurity induced charge generation is much faster and depends on excitation wavelength; it occurs on the several hundred femtosecond time scale under excitation within the main absorption band, but excitation into the red wing of the absorption band results in charge generation... (More)
Charge carrier generation and decay in m-LPPP polymer films were examined by means of femtosecond transient absorption spectroscopy in the time window of 100 fs-15 ns. Two modes of polaron formation with distinct behavior were identified, impurity induced in the absence of an external electric field and electric field induced in pristine film. While field induced charge generation is relatively slow, occurring throughout the excited state lifetime, the rate of impurity induced charge generation is much faster and depends on excitation wavelength; it occurs on the several hundred femtosecond time scale under excitation within the main absorption band, but excitation into the red wing of the absorption band results in charge generation within less than 100 fs. Polaron decay through geminate electron-hole recombination occurs with widely distributed lifetimes, from similar to 0.8 ns to microseconds; the polarons characterized by the shortest decay time have a redshifted absorption spectrum (as compared to more long-lived polarons) and are attributed to tightly bound polaron pairs. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
76
issue
23
publisher
American Physical Society
external identifiers
  • wos:000251986500056
  • scopus:36848998790
ISSN
1098-0121
DOI
10.1103/PhysRevB.76.235203
language
English
LU publication?
yes
id
ce9ceb30-cb4f-44ac-91cc-8fbdcd6e38c8 (old id 1408345)
date added to LUP
2009-05-29 13:00:39
date last changed
2017-01-01 07:11:26
@article{ce9ceb30-cb4f-44ac-91cc-8fbdcd6e38c8,
  abstract     = {Charge carrier generation and decay in m-LPPP polymer films were examined by means of femtosecond transient absorption spectroscopy in the time window of 100 fs-15 ns. Two modes of polaron formation with distinct behavior were identified, impurity induced in the absence of an external electric field and electric field induced in pristine film. While field induced charge generation is relatively slow, occurring throughout the excited state lifetime, the rate of impurity induced charge generation is much faster and depends on excitation wavelength; it occurs on the several hundred femtosecond time scale under excitation within the main absorption band, but excitation into the red wing of the absorption band results in charge generation within less than 100 fs. Polaron decay through geminate electron-hole recombination occurs with widely distributed lifetimes, from similar to 0.8 ns to microseconds; the polarons characterized by the shortest decay time have a redshifted absorption spectrum (as compared to more long-lived polarons) and are attributed to tightly bound polaron pairs.},
  articleno    = {235203},
  author       = {Gulbinas, V. and Hertel, D. and Yartsev, Arkady and Sundström, Villy},
  issn         = {1098-0121},
  language     = {eng},
  number       = {23},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Charge carrier photogeneration and recombination in ladder-type poly(para-phenylene): Interplay between impurities and external electric field},
  url          = {http://dx.doi.org/10.1103/PhysRevB.76.235203},
  volume       = {76},
  year         = {2007},
}