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Fullerene mixtures enhance the thermal stability of a non-crystalline polymer solar cell blend
Chalmers, Sweden .
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
Chalmers, Sweden .
Chalmers, Sweden .
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2014 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 104, no 15, 153301- p.Article in journal (Refereed) Published
Abstract [en]

Printing of polymer: fullerene solar cells at high speed requires annealing at temperatures up to 140 degrees C. However, bulk-heterojunction blends that comprise a non-crystalline donor polymer often suffer from insufficient thermal stability and hence rapidly coarsen upon annealing above the glass transition temperature of the blend. In addition, micrometer-sized fullerene crystals grow, which are detrimental for the solar cell performance. In this manuscript, we present a strategy to limit fullerene crystallization, which is based on the use of fullerene mixtures of the two most common derivatives, PC61BM and PC71BM, as the acceptor material. Blends of this fullerene mixture and a non-crystalline thiophene-quinoxaline copolymer display considerably enhanced thermal stability and largely retain their photovoltaic performance upon annealing at elevated temperatures as high as 170 degrees C.

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2014. Vol. 104, no 15, 153301- p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-106968DOI: 10.1063/1.4870997ISI: 000335145200064OAI: oai:DiVA.org:liu-106968DiVA: diva2:721387
Available from: 2014-06-04 Created: 2014-06-02 Last updated: 2017-12-05

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