Fullerene mixtures enhance the thermal stability of a non-crystalline polymer solar cell blend
Journal article, 2014

Printing of polymer:fullerene solar cells at high speed requires annealing at temperatures up to 140 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 C.

Author

Camilla Lindqvist

Polymer Technology

Jonas Bergqvist

Linköping University

Olof Bäcke

Chalmers, Applied Physics, Eva Olsson Group

Stefan Gustafsson

Chalmers, Applied Physics, Eva Olsson Group

SuMo Biomaterials

Ergang Wang

Chalmers, Chemical and Biological Engineering, Polymer Technology

Eva Olsson

Linköping University

Chalmers, Applied Physics, Eva Olsson Group

Olle Inganäs

Linköping University

Mats Andersson

Chalmers, Chemical and Biological Engineering, Polymer Technology

Christian Müller

Chalmers, Chemical and Biological Engineering, Polymer Technology

Applied Physics Letters

0003-6951 (ISSN) 1077-3118 (eISSN)

Vol. 104 15 153301- 153301

Subject Categories

Polymer Chemistry

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Energy

Materials Science

DOI

10.1063/1.4870997

More information

Latest update

12/5/2018