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Ultrafast light-induced charge pair formation dynamics in poly[3-(2 '-methoxy-5 ' octylphenyl)thiophene]

Zausjitsyn, Yuri LU ; Gulbinas, V; Zigmantas, Donatas LU ; Zhang, F L; Inganas, O; Sundström, Villy LU and Yartsev, Arkady LU (2004) In Physical Review B (Condensed Matter and Materials Physics) 70(7). p.1-075202
Abstract
Charge pair photogeneration was investigated by ultrafast absorption spectroscopy for different excitation photon energies in poly[3-(2(')-methoxy-5(')octylphenyl)thiophene] (POMeOPT) film with and without an external electric field. Electric field-assisted charge pair photogeneration in POMeOPT occurs from vibrationally relaxed singlet excitons during their entire lifetime and charge pair formation takes place in this manner even in the absence of an external electric field. From our data there are no indications of hot exciton dissociation to charge pairs even when a large amount of excess energy is supplied to the excitons. To explain these observations we present a model with energy transfer to low-barrier dissociation sites as a key... (More)
Charge pair photogeneration was investigated by ultrafast absorption spectroscopy for different excitation photon energies in poly[3-(2(')-methoxy-5(')octylphenyl)thiophene] (POMeOPT) film with and without an external electric field. Electric field-assisted charge pair photogeneration in POMeOPT occurs from vibrationally relaxed singlet excitons during their entire lifetime and charge pair formation takes place in this manner even in the absence of an external electric field. From our data there are no indications of hot exciton dissociation to charge pairs even when a large amount of excess energy is supplied to the excitons. To explain these observations we present a model with energy transfer to low-barrier dissociation sites as a key feature. (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
70
issue
7
pages
1 - 075202
publisher
American Physical Society
external identifiers
  • wos:000223716600044
  • scopus:19544368971
ISSN
1098-0121
DOI
10.1103/PhysRevB.70.075202
language
English
LU publication?
yes
id
25e626f5-66df-46c8-9f9b-df239674eb85 (old id 138947)
date added to LUP
2007-07-04 09:08:15
date last changed
2017-08-27 05:13:39
@article{25e626f5-66df-46c8-9f9b-df239674eb85,
  abstract     = {Charge pair photogeneration was investigated by ultrafast absorption spectroscopy for different excitation photon energies in poly[3-(2(')-methoxy-5(')octylphenyl)thiophene] (POMeOPT) film with and without an external electric field. Electric field-assisted charge pair photogeneration in POMeOPT occurs from vibrationally relaxed singlet excitons during their entire lifetime and charge pair formation takes place in this manner even in the absence of an external electric field. From our data there are no indications of hot exciton dissociation to charge pairs even when a large amount of excess energy is supplied to the excitons. To explain these observations we present a model with energy transfer to low-barrier dissociation sites as a key feature.},
  author       = {Zausjitsyn, Yuri and Gulbinas, V and Zigmantas, Donatas and Zhang, F L and Inganas, O and Sundström, Villy and Yartsev, Arkady},
  issn         = {1098-0121},
  language     = {eng},
  number       = {7},
  pages        = {1--075202},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Ultrafast light-induced charge pair formation dynamics in poly[3-(2 '-methoxy-5 ' octylphenyl)thiophene]},
  url          = {http://dx.doi.org/10.1103/PhysRevB.70.075202},
  volume       = {70},
  year         = {2004},
}