Recombination studies in a polyfluorene copolymer for photovoltaic applications
(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
- Aarnio, H ; Westerling, M ; Osterbacka, R ; Svensson, M ; Andersson, M ; Pascher, Torbjörn LU ; Pan, J ; Sundström, Villy LU and Stubb, H
- organization
- publishing date
- 2005
- 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
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- 372811d8-0571-4a00-ad24-05e09489c180 (old id 157779)
- date added to LUP
- 2016-04-01 16:34:46
- date last changed
- 2022-01-28 20:39:30
@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}},
doi = {{10.1016/j.synthmet.2005.01.033}},
volume = {{155}},
year = {{2005}},
}