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Recombination studies in a polyfluorene copolymer for photovoltaic applications

Aarnio, H; Westerling, M; Osterbacka, R; Svensson, M; Andersson, M; Pascher, Torbjörn LU ; Pan, J; Sundström, Villy LU and Stubb, H (2005) In Synthetic Metals 155(2). p.299-302
Abstract
We present detailed continuous wave (cw) and transient photoinduced absorption (PA) measurements in thin films of a novel alternating polyfluorene copolymer, poly[2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3-benzo-thiadiazole)] (DiO-PFDTBT), and its blends with the soluble fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) in weight ratios of 1:0, 4:1 and 1:4. We measure the frequency, intensity and temperature dependence of the PA signal in the frequency domain, and compare with the results obtained from the transient PA decay measurements in the time domain. In all blends, the PA spectrum shows a broad high energy PA band ranging from 1 eV to 2 eV as well as a low energy band peaking at 0.35 eV. We... (More)
We present detailed continuous wave (cw) and transient photoinduced absorption (PA) measurements in thin films of a novel alternating polyfluorene copolymer, poly[2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3-benzo-thiadiazole)] (DiO-PFDTBT), and its blends with the soluble fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) in weight ratios of 1:0, 4:1 and 1:4. We measure the frequency, intensity and temperature dependence of the PA signal in the frequency domain, and compare with the results obtained from the transient PA decay measurements in the time domain. In all blends, the PA spectrum shows a broad high energy PA band ranging from 1 eV to 2 eV as well as a low energy band peaking at 0.35 eV. We attribute the low energy band to the P1 transition of polarons and part of the high energy band to the correlated P2 transition of polarons. Both frequency and time domain measurements show that the high energy band has two decay components, a faster component in the microsecond time regime and a slower component in the millisecond time regime. The slow component is strongly dispersive, whereas the fast component is practically non-dispersive. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Synthetic Metals
volume
155
issue
2
pages
299 - 302
publisher
Elsevier
external identifiers
  • wos:000234150000016
  • scopus:28544450301
ISSN
0379-6779
DOI
10.1016/j.synthmet.2005.01.033
language
English
LU publication?
yes
id
372811d8-0571-4a00-ad24-05e09489c180 (old id 157779)
date added to LUP
2007-06-26 08:15:11
date last changed
2017-01-01 07:09:05
@article{372811d8-0571-4a00-ad24-05e09489c180,
  abstract     = {We present detailed continuous wave (cw) and transient photoinduced absorption (PA) measurements in thin films of a novel alternating polyfluorene copolymer, poly[2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3-benzo-thiadiazole)] (DiO-PFDTBT), and its blends with the soluble fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) in weight ratios of 1:0, 4:1 and 1:4. We measure the frequency, intensity and temperature dependence of the PA signal in the frequency domain, and compare with the results obtained from the transient PA decay measurements in the time domain. In all blends, the PA spectrum shows a broad high energy PA band ranging from 1 eV to 2 eV as well as a low energy band peaking at 0.35 eV. We attribute the low energy band to the P1 transition of polarons and part of the high energy band to the correlated P2 transition of polarons. Both frequency and time domain measurements show that the high energy band has two decay components, a faster component in the microsecond time regime and a slower component in the millisecond time regime. The slow component is strongly dispersive, whereas the fast component is practically non-dispersive.},
  author       = {Aarnio, H and Westerling, M and Osterbacka, R and Svensson, M and Andersson, M and Pascher, Torbjörn and Pan, J and Sundström, Villy and Stubb, H},
  issn         = {0379-6779},
  language     = {eng},
  number       = {2},
  pages        = {299--302},
  publisher    = {Elsevier},
  series       = {Synthetic Metals},
  title        = {Recombination studies in a polyfluorene copolymer for photovoltaic applications},
  url          = {http://dx.doi.org/10.1016/j.synthmet.2005.01.033},
  volume       = {155},
  year         = {2005},
}