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Charge Carrier Dynamics of Polymer: Fullerene Blends: From Geminate to Non-Geminate Recombination

Vithanage, Dimali LU ; Wang, Ergang; Wang, Zhongqiang; Ma, Fei LU ; Inganas, Olle; Andersson, Mats R.; Yartsev, Arkady LU ; Sundström, Villy LU and Pascher, Torbjörn LU (2014) In Advanced Energy Materials 4(8).
Abstract
The charge carrier dynamics of a new polymer-fullerene blend are examined on the femtosecond to the millisecond time scale. The full time range is globally fitted using a chemical reaction rate model that includes all key processes, charge generation, energy transfer, charge separation, and recombination, over the full 12 orders of magnitude in time and a factor of 33 in light intensity. Particular attention is paid to the charge recombination processes and it is found that they are highly material specific. Comparison of the dynamics to those of a previously studied polymer: fullerene blend reveals that while for one blend the recombination dynamics are mainly controlled by geminate recombination, the charge recombination in the presently... (More)
The charge carrier dynamics of a new polymer-fullerene blend are examined on the femtosecond to the millisecond time scale. The full time range is globally fitted using a chemical reaction rate model that includes all key processes, charge generation, energy transfer, charge separation, and recombination, over the full 12 orders of magnitude in time and a factor of 33 in light intensity. Particular attention is paid to the charge recombination processes and it is found that they are highly material specific. Comparison of the dynamics to those of a previously studied polymer: fullerene blend reveals that while for one blend the recombination dynamics are mainly controlled by geminate recombination, the charge recombination in the presently studied polymer: fullerene blend are entirely controlled by non-geminate electron-hole recombination. Carrier density dependence of the non-geminate recombination rate is analyzed and a correlated disorder model of site energies is proposed to explain the observed dependency. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Advanced Energy Materials
volume
4
issue
8
publisher
Wiley-Blackwell
external identifiers
  • wos:000338020900015
  • scopus:84902085110
ISSN
1614-6832
DOI
10.1002/aenm.201301706
language
English
LU publication?
yes
id
a9d82c6f-a585-45a7-ac9a-adf26e1dc83e (old id 4609185)
date added to LUP
2014-08-28 15:40:11
date last changed
2017-06-18 03:02:29
@article{a9d82c6f-a585-45a7-ac9a-adf26e1dc83e,
  abstract     = {The charge carrier dynamics of a new polymer-fullerene blend are examined on the femtosecond to the millisecond time scale. The full time range is globally fitted using a chemical reaction rate model that includes all key processes, charge generation, energy transfer, charge separation, and recombination, over the full 12 orders of magnitude in time and a factor of 33 in light intensity. Particular attention is paid to the charge recombination processes and it is found that they are highly material specific. Comparison of the dynamics to those of a previously studied polymer: fullerene blend reveals that while for one blend the recombination dynamics are mainly controlled by geminate recombination, the charge recombination in the presently studied polymer: fullerene blend are entirely controlled by non-geminate electron-hole recombination. Carrier density dependence of the non-geminate recombination rate is analyzed and a correlated disorder model of site energies is proposed to explain the observed dependency.},
  articleno    = {1301706},
  author       = {Vithanage, Dimali and Wang, Ergang and Wang, Zhongqiang and Ma, Fei and Inganas, Olle and Andersson, Mats R. and Yartsev, Arkady and Sundström, Villy and Pascher, Torbjörn},
  issn         = {1614-6832},
  language     = {eng},
  number       = {8},
  publisher    = {Wiley-Blackwell},
  series       = {Advanced Energy Materials},
  title        = {Charge Carrier Dynamics of Polymer: Fullerene Blends: From Geminate to Non-Geminate Recombination},
  url          = {http://dx.doi.org/10.1002/aenm.201301706},
  volume       = {4},
  year         = {2014},
}