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A nonfullerene electron acceptor (IEIC) based on indaceno1,2-b:5,6-b′dithiophene and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile was designed and synthesized, and fullerene-free polymer solar cells based on the IEIC acceptor showed power conversion efficiencies of up to 6.31%.
Lin et al. (Fri,) studied this question.
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