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The introduction of the polymerized small-molecule acceptor (PSMA) strategy has significantly enhanced the power conversion efficiency of all-polymer solar cells (all-PSCs). Within this strategy, PY-IT, as an outstanding representative of PSMA, demonstrates remarkable performance, thus finding extensive application in the mechanism investigation and performance optimization of all-PSCs. For more details regarding research based on PY-IT, please refer to the article by Sun et al. on page 3714—3728.