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Neat C60:C70 buckminsterfullerene mixtures enhance polymer solar cell performance
Department of Chemical and Biological Engineering/Polymer Technology, Chalmers University of of Technology, 41296 Göteborg, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
Department of Applied Physics, Chalmers University of of Technology, 41296 Göteborg, Sweden.
Department of Chemical and Biological Engineering/Polymer Technology, Chalmers University of of Technology, 41296 Göteborg, Sweden.
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2014 (English)In: Journal of Materials Chemistry A, ISSN 2050-7496, Vol. 2, no 35, 14354-14359 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate that bulk-heterojunction blends based on neat, unsubstituted buckminsterfullerenes (C60, C70) and a thiophene-quinoxaline copolymer (TQ1) can be readily processed from solution. Atomic force and transmission electron microscopy as well as photoluminescence spectroscopy reveal that thin films with a fine-grained nanostructure can be spin-coated, which display a good photovoltaic performance. Replacement of substituted fullerenes with C60 or C70 only results in a small drop in open-circuit voltage from 0.9 V to about 0.8 V. Thus, a power conversion efficiency of up to 2.9% can be maintained if C70 is used as the acceptor material. Further improvement in photovoltaic performance to 3.6% is achieved, accompanied by a high internal quantum efficiency of 75%, if a 1:1 C60:C70 mixture is used as the acceptor material, due to its improved solubility in ortho-dichlorobenzene. © the Partner Organisations 2014.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014. Vol. 2, no 35, 14354-14359 p.
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Chemical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-109970DOI: 10.1039/c4ta02515fISI: 000340768000008Scopus ID: 2-s2.0-84906087536OAI: oai:DiVA.org:liu-109970DiVA: diva2:746245
Available from: 2014-09-12 Created: 2014-08-29 Last updated: 2015-06-01Bibliographically approved

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Bergqvist, JonasGao, FengInganäs, Olle

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