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|Title:||Highly Efficient and Reproducible Nonfullerene Solar Cells from Hydrocarbon Solvents||Authors:||McCulloch, Iain
Ashraf, Raja Shahid
Durrant, James R.
|Major Field of Science:||Engineering and Technology||Field Category:||Mechanical Engineering;Materials Engineering||Keywords:||Organic photovoltaics;Solar cells;Fullerenes||Issue Date:||14-Jul-2017||Source:||ACS Energy Letters, 2017, vol. 2, no. 7, pp. 1494-1500||Volume:||2||Issue:||7||Start page:||1494||End page:||1500||Journal:||ACS Energy Letters||Abstract:||With chlorinated solvents unlikely to be permitted for use in solution-processed organic solar cells in industry, there must be a focus on developing nonchlorinated solvent systems. Here we report high-efficiency devices utilizing a low-bandgap donor polymer (PffBT4T-2DT) and a nonfullerene acceptor (EH-IDTBR) from hydrocarbon solvents and without using additives. When mesitylene was used as the solvent, rather than chlorobenzene, an improved power conversion efficiency (11.1%) was achieved without the need for pre- or post-treatments. Despite altering the processing conditions to environmentally friendly solvents and room-temperature coating, grazing incident X-ray measurements confirmed that active layers processed from hydrocarbon solvents retained the robust nanomorphology obtained with hot-processed chlorinated solvents. The main advantages of hydrocarbon solvent-processed devices, besides the improved efficiencies, were the reproducibility and storage lifetime of devices. Mesitylene devices showed better reproducibility and shelf life up to 4000 h with PCE dropping by only 8% of its initial value.||ISSN:||2380-8195||DOI:||10.1021/acsenergylett.7b00390||Rights:||© American Chemical Society||Type:||Article||Affiliation :||Imperial College London
King Abdullah University of Science and Technology
Cyprus University of Technology
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