Journal
SMALL
Volume 14, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201801542
Keywords
as-cast devices; fluorination; isatin (1H-indole-2,3-dione); organic solar cells; small molecule donors
Categories
Funding
- National Key R&D Program of China [2017YFA0204704]
- National Science Foundation of China [51773091, 61604069]
- Natural Science Foundation of Jiangsu Province [BK20171465, BK20150064]
- King Abdullah University of Science and Technology (KAUST) Solar Center Competitive Fund (CCF)
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Solution-processable small molecules (SMs) have attracted intense attention due to their definite molecular structures, less batch-to-batch variation, and easier structure control. Herein, two new SM donors based on substituted isatin unit (DI3T, DI3T-2F) are synthesized and applied as electron donors with the mixture of PC71BM to construct organic photovoltaics. As a result, 5,6-difluoro isatin derivative (DI3T-2F) obtains a power conversion efficiency of 7.80% by a simple solution spin-coating fabrication process without any additives, solvent, or thermal annealing process. More intuitively, due to stronger intermolecular interaction and higher hole mobility after the incorporation of fluorine atoms in end units, the devices present good tolerance to active layer thickness. The results indicate that DI3T-2F shows promising potential for large-scale printing processes and flexible application of efficient small molecule organic solar cells.
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