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We propose a strategy to improve performance of unidirectionally extended fused‐ring electron acceptors by using pyrrolo[3,2‐b]pyrrole to replace pyrrole ring, and design two asymmetric nonfullerene acceptors 1PIC and 2PIC. Replacing pyrrole in 1PIC with pyrrolo[3,2‐b]pyrrole remarkably red‐shifts absorption peak by 109 nm, elevates the HOMO and LUMO energy levels, and improves electron mobility....
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