期刊
ACS ENERGY LETTERS
卷 2, 期 7, 页码 1494-1500出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00390
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类别
资金
- KAUST
- Welsh Assembly Government Ser Solar Project
- EC [610115]
- EPSRC [EP/G037515/1, EP/M005143/1, EP/L016702/1]
- Engineering and Physical Sciences Research Council [EP/J021199/1, 1648728, 1565500, EP/M005143/1] Funding Source: researchfish
- EPSRC [EP/J021199/1, EP/M005143/1] Funding Source: UKRI
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.
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