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Title: Highly Efficient and Reproducible Nonfullerene Solar Cells from Hydrocarbon Solvents
Authors: McCulloch, Iain
Zhang, Weimin 
Amassian, Aram 
Little, Mark 
Pont, Sebastian 
Ashraf, Raja Shahid 
Hamid, Zeinab 
Neophytou, Marios 
Baran, Derya
Wadsworth, Andrew 
Moser, Maximilian 
Durrant, James R.
Abdelsamie, Maged 
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 
Swansea University 
Cyprus University of Technology 
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