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Comparison of selen...
Comparison of selenophene and thienothiophene incorporation into pentacyclic lactam-based conjugated polymers for organic solar cells
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Kroon, Renee (author)
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Melianas, Armantas (author)
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Zhuang, Wenliu (author)
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Bergqvist, Jonas (author)
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Diaz de Zerio Mendaza, Amaia (author)
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Steckler, Timothy T. (author)
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Yu, Liyang (author)
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Bradley, Siobhan J. (author)
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Musumeci, Chiara (author)
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Gedefaw, Desta (author)
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Nann, Thomas (author)
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Amassian, Aram (author)
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Muller, Christian (author)
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Inganäs, Olle (author)
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Andersson, Mats R. (author)
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(publisher)
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(publisher)
- ROYAL SOC CHEMISTRY 2015
- 2015
- English.
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In: Polymer Chemistry. - 1759-9954. ; 6:42, 7402-7409
Abstract
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- In this work, we compare the effect of incorporating selenophene versus thienothiophene spacers into pentacyclic lactam-based conjugated polymers for organic solar cells. The two cyclic lactam-based copolymers were obtained via a new synthetic method for the lactam moiety. Selenophene incorporation results in a broader and red-shifted optical absorption while retaining a deep highest occupied molecular orbital level, whereas thienothienophene incorporation results in a blue-shifted optical absorption. Additionally, grazing-incidence wide angle X-ray scattering data indicates edge- and face-on solid state order for the selenophene-based polymer as compared to the thienothiophene-based polymer, which orders predominantly edge-on with respect to the substrate. In polymer : PC71BM bulk heterojunction solar cells both materials show a similar open-circuit voltage of similar to 0.80-0.84 V, however the selenophene-based polymer displays a higher fill factor of similar to 0.70 vs. similar to 0.65. This is due to the partial face-on backbone orientation of the selenophene-based polymer, leading to a higher hole mobility, as confirmed by single-carrier diode measurements, and a concomitantly higher fill factor. Combined with improved spectral coverage of the selenophene-based polymer, as confirmed by quantum efficiency experiments, it offers a larger short-circuit current density of similar to 12 mA cm(-2). Despite the relatively low molecular weight of both materials, a very robust power conversion efficiency similar to 7% is achieved for the selenophene-based polymer, while the thienothiophene-based polymer demonstrates only a moderate maximum PCE of similar to 5.5%. Hence, the favorable effects of selenophene incorporation on the photovoltaic performance of pentacyclic lactam-based conjugated polymers are clearly demonstrated.
Subject headings
- Natural Sciences (hsv)
- Biological Sciences (hsv)
- Naturvetenskap (hsv)
- Biologiska vetenskaper (hsv)
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- By the author/editor
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Kroon, Renee
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Melianas, Armant ...
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Zhuang, Wenliu
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Bergqvist, Jonas
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Diaz de Zerio Me ...
-
Steckler, Timoth ...
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show more...
-
Yu, Liyang
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Bradley, Siobhan ...
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Musumeci, Chiara
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Gedefaw, Desta
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Nann, Thomas
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Amassian, Aram
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Muller, Christia ...
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Inganäs, Olle
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Andersson, Mats ...
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show less...
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