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Phase behaviour of liquid-crystalline polymer/fullerene organic photovoltaic blends: thermal stability and miscibility
Department of Physics, Chemistry and Biology, Linköpings universitet, Sweden. (Biomolecular and Organic Electronics)
Department of Physics, Chemistry and Biology, Linköpings universitet, Sweden. (Biomolecular and Organic Electronics)
Department of Physics, Chemistry and Biology, Linköpings universitet, Sweden. (Biomolecular and Organic Electronics)
Department of Physics, Chemistry and Biology, Linköpings universitet, Sweden. (Biomolecular and Organic Electronics)
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2011 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 21, p. 10676-10684Article in journal (Refereed) Published
Abstract [en]

The thermal behaviour of an organic photovoltaic (OPV) binary system comprised of a liquidcrystalline fluorene-based polymer and a fullerene derivative is investigated. We employ variabletemperature ellipsometry complemented by photo- and electroluminescence spectroscopy as well as optical microscopy and scanning force nanoscopy to explore phase transitions of blend thin films. The high glass transition temperature correlates with the good thermal stability of solar cells based on these materials. Furthermore, we observe partial miscibility of the donor and acceptor together with the tendency of excess fullerene derivative to segregate into exceedingly large domains. Thus, for charge generation less adequate bulk-heterojunction nanostructures are poised to develop if this mixture is exposed to more elevated temperatures. Gratifyingly, the solubility of the fullerene derivative in the polymer phase is found to decrease if a higher molecular-weight polymer fraction is employed, which offers routes towards improving the photovoltaic performance of non-crystalline OPV blends.

Place, publisher, year, edition, pages
RSC Publishing , 2011. Vol. 21, p. 10676-10684
National Category
Physical Chemistry Condensed Matter Physics Textile, Rubber and Polymeric Materials
Research subject
Chemistry; Physics
Identifiers
URN: urn:nbn:se:kau:diva-15749DOI: 10.1039/c1jm11239bISI: 000292978600016OAI: oai:DiVA.org:kau-15749DiVA, id: diva2:571747
Available from: 2012-11-23 Created: 2012-11-23 Last updated: 2017-12-07Bibliographically approved

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Anselmo, Ana SofiaMoons, Ellen

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