New non-fullerene acceptors containing selenium for organic solar cells
발표자
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초록
내용
Non-fullerene acceptors (NFAs) have been crucial in improving the efficiency of organic solar cells (OSCs) due to their attractive properties, such as strong light-harvesting ability, easily tunable energy levels, and high crystallinity. Nevertheless, general NFAs have limited light absorption, and studies on the design of NFAs that can absorb a broad range of the solar spectrum and that have absorption complementary to that of donors should be conducted. Because selenium can induce strong intermolecular Se···Se interactions, planarity, and extended effective conjugated length in OSC materials, in our study, we synthesized a series of selenium-substituted Y6 derivatives with different inner alkyl chain lengths, Se-Y6-BO and Se-Y6-HD. The optical absorption of two selenium-containing NFAs was redshifted compared with that of Y6 due to the effect of selenium atoms in the backbone.