Sub-glass transition annealing enhances polymer solar cell performance
2014 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 2, no 17, 6146-6152 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014. Vol. 2, no 17, 6146-6152 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-106302DOI: 10.1039/c3ta14165aISI: 000333580700024OAI: oai:DiVA.org:liu-106302DiVA: diva2:715706