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A fullerene alloy based photovoltaic blend with a glass transition temperature above 200 degrees C
Chalmers, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Chalmers, Sweden.
Chalmers, Sweden.
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2017 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 5, no 8, p. 4156-4162Article in journal (Refereed) Published
Abstract [en]

Organic solar cells with a high degree of thermal stability require bulk-heterojunction blends that feature a high glass transition, which must occur considerably above the temperatures encountered during device fabrication and operation. Here, we demonstrate for the first time a polymer : fullerene blend with a glass transition temperature above 200 degrees C, which we determine by plasmonic nanospectroscopy. We achieve this strong tendency for glass formation through the use of an alloy of neat, unsubstituted C-60 and C-70, which we combine with the fluorothieno-benzodithiophene copolymer PTB7. A stable photovoltaic performance of PTB7 : C60 : C70 ternary blends is preserved despite annealing the active layer at up to 180 degrees C, which coincides with the onset of the glass transition. Rapid deterioration of the power conversion efficiency from initially above 5% only occurs upon exceeding the glass transition temperature of 224 degrees C of the ternary blend.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2017. Vol. 5, no 8, p. 4156-4162
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-136089DOI: 10.1039/c6ta08106aISI: 000395309800044OAI: oai:DiVA.org:liu-136089DiVA, id: diva2:1084721
Note

Funding Agencies|Swedish Research Council; Swedish Foundation for Strategic Research [RMA11-0037, RMA15-0052]; Swedish Energy Agency

Available from: 2017-03-27 Created: 2017-03-27 Last updated: 2017-11-29

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Melianas, ArmantasInganäs, Olle
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