A Fullerene Alloy Based Photovoltaic Blend with a Glass Transition Temperature above 200 °C
Journal article, 2017

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 °C, which we determine by plasmonic nanospectroscopy. We achieve this strong tendency for glass formation through the use of an alloy of neat, unsubstituted C60 and C70, 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 °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 °C of the ternary blend.

Author

Amaia Diaz de Zerio Mendaza

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

A. Melianas

Linköping University

Ferry Nugroho

Chalmers, Physics, Chemical Physics

Olof Bäcke

Chalmers, Physics, Eva Olsson Group

Eva Olsson

Chalmers, Physics, Eva Olsson Group

Christoph Langhammer

Chalmers, Physics, Chemical Physics

Olle Inganäs

Linköping University

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Journal of Materials Chemistry A

20507488 (ISSN) 20507496 (eISSN)

Vol. 5 8 4156-4162

Subject Categories

Polymer Chemistry

Materials Chemistry

Organic Chemistry

DOI

10.1039/C6TA08106A

More information

Latest update

2/28/2018