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A simple and effective modification of phenyl‐C70‐butyric acid methyl ester (PC70BM) is carried out in a single step after which the material is used as electron acceptor for bulk heterojunction polymer solar cells (PSCs). The modified PC70BM, namely CN‐PC70BM, showed broader and stronger absorption in the visible region (350–550 nm) of the solar spectrum than PC70BM because of the presence of a cyanovinylene...
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