Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201909535
Keywords
as-cast ternary devices; asymmetrical side chains; high performance; small-molecule acceptors
Categories
Funding
- Office of Naval Research [N00014-17-1-2260, N00014-17-1-2201]
- National Key Research and Development Program of China [2017YFA0206602]
- National Natural Science Foundation of China [51861145301, 51773065]
- Chinese Scholar Counsel
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
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A new small-molecule nonfullerene acceptor based on the benzo[1,2-b:4,5-b ']dithiophene (BDT) fused central core with asymmetrical alkoxy and thienyl side chains, namely TOBDT, is designed and synthesized. The alkoxy unit helps narrow the bandgap, and thienyl side chain helps enhance the intermolecular interaction. As a result, TOBDT is suitable to match the deep-lying highest occupied molecular orbital (HOMO) of polymer donor PM6. Then, a strong crystalline acceptor IDIC is introduced as the third component to fabricate as-cast nonfullerene ternary devices to achieve absorption and morphology control. Addition of IDIC not only mixes well with TOBDT but modulates the morphology of the blend film, which helps to balance the charge transport properties and reduce the photovoltage loss of ternary devices. All these contribute to synergetic improvement of J(sc), V-oc, and fill factor parameters, leading to a power conversion efficiency of 14.0% for the as-cast fullerene-free ternary device.
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