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Sub-glass transition annealing enhances polymer solar cell performance
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- Bergqvist, Jonas (author)
- Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan
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- Lindqvist, Camilla (author)
- Chalmers, Sweden
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- Backe, Olof (author)
- Chalmers, Sweden
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- (creator_code:org_t)
- 2014
- 2014
- English.
- In: Journal of Materials Chemistry A. - : Royal Society of Chemistry. - 2050-7488. ; 2:17, s. 6146-6152
- Journal article (peer-reviewed)
Abstract
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- 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.
Keyword
- TECHNOLOGY
- TEKNIKVETENSKAP
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- art (subject category)
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