A fullerene alloy based photovoltaic blend with a glass transition temperature above 200 degrees C

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

Melianas, ArmantasLinköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten(Swepub:liu)armme53 (author)
Nugroho, Ferry A. A.Chalmers, Sweden (author)
Backe, OlofChalmers, Sweden (author)
Olsson, EvaChalmers, Sweden (author)
Langhammer, ChristophChalmers, Sweden (author)
Inganäs, OlleLinköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten(Swepub:liu)ollin59 (author)
Mueller, ChristianChalmers, Sweden (author)
Chalmers, SwedenBiomolekylär och Organisk Elektronik (creator_code:org_t)

In:Journal of Materials Chemistry A: ROYAL SOC CHEMISTRY5:8, s. 4156-41622050-74882050-7496

By the author/editor: Diaz de Zerio Me ...; Melianas, Armant ...; Nugroho, Ferry A ...; Backe, Olof; Olsson, Eva; Langhammer, Chri ...; show more...; Inganäs, Olle; Mueller, Christi ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

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