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Nonfused-ring electron acceptors (NFREAs) can be considered as one of the most promising candidates for low-cost active-layer materials. Through the incorporation of asymmetric end-group engineering, the resulting asymmetric acceptor demonstrates improved optophysical properties and packing behavior, such as a more coplanar π-conjugated backbone, a broader light absorption range, and appropriate crystallinity. More details are discussed in the article by Liu et al. on page 485—490.