Sub-glass transition annealing enhances polymer solar cell performance
Artikel i vetenskaplig tidskrift, 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.
Författare
J. Bergqvist
Linköpings universitet
Camilla Lindqvist
Chalmers, Kemi- och bioteknik, Polymerteknologi
Olof Bäcke
Chalmers, Teknisk fysik, Eva Olsson Group
Z. F. Ma
Linköpings universitet
Z. Tang
Linköpings universitet
W. Tress
Linköpings universitet
Stefan Gustafsson
SuMo Biomaterials
Chalmers, Teknisk fysik, Eva Olsson Group
Ergang Wang
Chalmers, Kemi- och bioteknik, Polymerteknologi
Eva Olsson
Chalmers, Teknisk fysik, Eva Olsson Group
Mats Andersson
Chalmers, Kemi- och bioteknik, Polymerteknologi
Olle Inganäs
Linköpings universitet
Christian Müller
Chalmers, Kemi- och bioteknik, Polymerteknologi
Journal of Materials Chemistry A
20507488 (ISSN) 20507496 (eISSN)
Vol. 2 17 6146-6152Ämneskategorier
Kemi
DOI
10.1039/C3TA14165A