Sub-glass transition annealing enhances polymer solar cell performance
Journal article, 2014

Thermal annealing of non-crystalline polymer:fullerene blends typically results in a drastic decrease in solar cell performance. In particular aggressive annealing above the glass transition temperature results in a detrimental coarsening of the blend nanostructure. We demonstrate that mild annealing below the glass transition temperature is a viable avenue to control the nanostructure of a non-crystalline thiophene–quinoxaline copolymer:fullerene blend. Direct imaging methods indicate that coarsening of the blend nanostructure can be avoided. However, a combination of absorption and luminescence spectroscopy reveals that local changes in the polymer conformation as well as limited fullerene aggregation are permitted to occur. As a result, we are able to optimise the solar cell performance evenly across different positions of the coated area, which is a necessary criterion for large-scale, high throughput production.

Author

J. Bergqvist

Linköping University

Camilla Lindqvist

Chalmers, Chemical and Biological Engineering, Polymer Technology

Olof Bäcke

Chalmers, Applied Physics, Eva Olsson Group

Z. F. Ma

Linköping University

Z. Tang

Linköping University

W. Tress

Linköping University

Stefan Gustafsson

SuMo Biomaterials

Chalmers, Applied Physics, Eva Olsson Group

Ergang Wang

Chalmers, Chemical and Biological Engineering, Polymer Technology

Eva Olsson

Chalmers, Applied Physics, Eva Olsson Group

Mats Andersson

Chalmers, Chemical and Biological Engineering, Polymer Technology

Olle Inganäs

Linköping University

Christian Müller

Chalmers, Chemical and Biological Engineering, Polymer Technology

Journal of Materials Chemistry A

20507488 (ISSN) 20507496 (eISSN)

Vol. 2 17 6146-6152

Subject Categories

Chemical Sciences

DOI

10.1039/C3TA14165A

More information

Latest update

2/28/2018