Journal
ADVANCED MATERIALS
Volume 30, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705485
Keywords
blade coating; film morphology; nonfullerene acceptors; nonhalogenated solvents; organic solar cells
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Funding
- UNC-GA Research Opportunity Initiative grant
- NSF INFEWS grant [CBET 1639429]
- NSF [CBET-1639429, DMR-1507249]
- National Nature Science Foundation of China [91633301, 91333204, 21325419]
- Chinese Academy of Science [XDB12030200]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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The commercialization of nonfullerene organic solar cells (OSCs) critically relies on the response under typical operating conditions (for instance, temperature and humidity) and the ability of scale-up. Despite the rapid increase in power conversion efficiency (PCE) of spin-coated devices fabricated in a protective atmosphere, the efficiencies of printed nonfullerene OSC devices by blade coating are still lower than 6%. This slow progress significantly limits the practical printing of high-performance nonfullerene OSCs. Here, a new and relatively stable nonfullerene combination is introduced by pairing the nonfluorinated acceptor IT-M with the polymeric donor FTAZ. Over 12% efficiency can be achieved in spin-coated FTAZ:IT-M devices using a single halogen-free solvent. More importantly, chlorine-free, blade coating of FTAZ:IT-M in air is able to yield a PCE of nearly 11% despite a humidity of approximate to 50%. X-ray scattering results reveal that large - coherence length, high degree of face-on orientation with respect to the substrate, and small domain spacing of approximate to 20 nm are closely correlated with such high device performance. The material system and approach yield the highest reported performance for nonfullerene OSC devices by a coating technique approximating scalable fabrication methods and hold great promise for the development of low-cost, low-toxicity, and high-efficiency OSCs by high-throughput production.
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