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Exciton dynamics in alternating polyfluorene/fullerene blends

De, Swati LU ; Kesti, Tero LU ; Maiti, Manisankar LU ; Zhang, Fengling; Inganas, Olle; Yartsev, Arkady LU ; Pascher, Torbjörn LU and Sundström, Villy LU (2008) In Chemical Physics 350(1-3). p.14-22
Abstract
Exciton dynamics in alternating copolymer/fullerene solar cell blends have been investigated using femtosecond transient absorption spectroscopy. The acceptor concentrations have been varied over a wide range. Experimental data, kinetic modeling and simulations, all indicate that the efficiency of exciton conversion to charges is 100% even at acceptor concentrations as low as 20 wt%. The reported dependence of solar cell efficiency on fullerene concentration may thus arise from other factors. However, there exists an acceptor concentration threshold (5 wt%) below which a substantial fraction of the excitations remain unquenched. The results, we believe are very relevant to optimization of performance efficiency by clever manipulation of... (More)
Exciton dynamics in alternating copolymer/fullerene solar cell blends have been investigated using femtosecond transient absorption spectroscopy. The acceptor concentrations have been varied over a wide range. Experimental data, kinetic modeling and simulations, all indicate that the efficiency of exciton conversion to charges is 100% even at acceptor concentrations as low as 20 wt%. The reported dependence of solar cell efficiency on fullerene concentration may thus arise from other factors. However, there exists an acceptor concentration threshold (5 wt%) below which a substantial fraction of the excitations remain unquenched. The results, we believe are very relevant to optimization of performance efficiency by clever manipulation of morphology. We have also observed exciton-exciton energy transfer in these blends at low acceptor concentrations. (C) 2007 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
exciton dynamics, polyfluorene/fullerene blends
in
Chemical Physics
volume
350
issue
1-3
pages
14 - 22
publisher
Elsevier
external identifiers
  • wos:000257539500004
  • scopus:76249105699
ISSN
0301-0104
DOI
10.1016/j.chemphys.2007.11.018
language
English
LU publication?
yes
id
b0ce312a-cc7f-4ef1-90ff-e5e75e8f1ebf (old id 1255123)
date added to LUP
2008-10-17 13:37:41
date last changed
2017-09-03 04:19:09
@article{b0ce312a-cc7f-4ef1-90ff-e5e75e8f1ebf,
  abstract     = {Exciton dynamics in alternating copolymer/fullerene solar cell blends have been investigated using femtosecond transient absorption spectroscopy. The acceptor concentrations have been varied over a wide range. Experimental data, kinetic modeling and simulations, all indicate that the efficiency of exciton conversion to charges is 100% even at acceptor concentrations as low as 20 wt%. The reported dependence of solar cell efficiency on fullerene concentration may thus arise from other factors. However, there exists an acceptor concentration threshold (5 wt%) below which a substantial fraction of the excitations remain unquenched. The results, we believe are very relevant to optimization of performance efficiency by clever manipulation of morphology. We have also observed exciton-exciton energy transfer in these blends at low acceptor concentrations. (C) 2007 Elsevier B.V. All rights reserved.},
  author       = {De, Swati and Kesti, Tero and Maiti, Manisankar and Zhang, Fengling and Inganas, Olle and Yartsev, Arkady and Pascher, Torbjörn and Sundström, Villy},
  issn         = {0301-0104},
  keyword      = {exciton dynamics,polyfluorene/fullerene blends},
  language     = {eng},
  number       = {1-3},
  pages        = {14--22},
  publisher    = {Elsevier},
  series       = {Chemical Physics},
  title        = {Exciton dynamics in alternating polyfluorene/fullerene blends},
  url          = {http://dx.doi.org/10.1016/j.chemphys.2007.11.018},
  volume       = {350},
  year         = {2008},
}