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Sub-glass transition annealing enhances polymer solar cell performance

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dc.contributor.authorBergqvist, J.
dc.contributor.authorLindqvist, C.
dc.contributor.authorBacke, O.
dc.contributor.authorMa, Z.
dc.contributor.authorTang, Z.
dc.contributor.authorTress, W.
dc.contributor.authorGustafsson, S.
dc.contributor.authorWang, E.
dc.contributor.authorOlsson, E.
dc.contributor.authorAndersson, M.R.
dc.contributor.authorInganas, O.
dc.contributor.authorMüller, C.
dc.date.issued2014
dc.description.abstractThermal 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.
dc.identifier.citationJournal of Materials Chemistry A, 2014; 2(17):6146-6152
dc.identifier.doi10.1039/c3ta14165a
dc.identifier.issn2050-7488
dc.identifier.issn2050-7496
dc.identifier.urihttps://hdl.handle.net/11541.2/115214
dc.language.isoen
dc.publisherRSC Publications
dc.rightsCopyright 2014 Royal Society of Chemistry
dc.source.urihttps://doi.org/10.1039/c3ta14165a
dc.subjectbulk-heterojunction solar cells
dc.subjectHOMO
dc.subjectLUMO
dc.subjectoptical absorption
dc.subjectpolyfluorenes
dc.titleSub-glass transition annealing enhances polymer solar cell performance
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9915930101701831

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