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A-D-A types non-fullerene small molecule acceptors (NF-SMAs) have achieved excellent progress in recent years, while the development of series of new materials. Herein, a new NF-SMA, named  BDSe-4F , based on linear benzo[1, 2-b:4, 5-b’] diselenophene with the difluorinated 5, 6-difluoro-3(dicyanomethylene) indanone ( IC-2F ) was synthesized and investigated. Due to the introduction of  IC-2F , the intramolecular charge transfer is enhanced. Furtherly, the  BDSe-4F  exhibits a wider absorption from 600-800 nm in solution. From solution to film, the absorption spectrum shows an obvious red-shifted in the range of 800-900 nm and the maximum absorption peak red-shifted at 31 nm, suggesting that much stronger intermolecular interactions caused by non-covalent bond of F....S,F.... Se, and S....O. The  BDSe-4F  possesses good spectral absorption range and excellent molecular stacking, which beneficial to achieve high  J SC and electron mobility. These results illustrate that the synergistic strategy of using benzo[1, 2-b:4, 5-b’] diselenophene core unit and  IC-2F  end group is a promising strategy to enhance performance in organic solar cells.

Synthesis and photophysical properties of fluorine substituted end group for benzo[1, 2-b:4, 5-b’] diselenophene-based small molecule acceptor