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Herein, by regulating the cyanobenzene substitution in the central core for the first time, four novel SMAs are synthesized, named phCN\u2010F, phCN\u2010Cl, 2phCN\u2010F, and 2phCN\u2010Cl. Theoretical and experimental analyses have shown that asymmetric and symmetric cyanobenzene\u2010substitution of the central core, coupled with selective terminal groups, can significantly affect the intrinsic excitonic properties of the molecule. Blends based on asymmetric cyanobenzene\u2010substitution molecules possess tighter molecular packing and more suitable phase separation to facilitate exciton dissociation, charge transport, and charge extraction. The optimal device performance of the phCN\u2010F\u2010based OSC reaches 20.16%, which is significantly higher than that of symmetrically substituted OSCs. Furthermore, devices prepared based on phCN\u2010F maintain over 90% of their initial efficiency after being heated at 85\u00b0C for 3000 h, demonstrating excellent thermal stability. This study elucidates the potential mechanisms for optimizing device performance through asymmetric cyanobenzene\u2010substitution of the central core, providing valuable insights for the further design of record\u2010breaking SMAs.<\/jats:p>","DOI":"10.1002\/adma.202504805","type":"journal-article","created":{"date-parts":[[2025,5,22]],"date-time":"2025-05-22T06:26:10Z","timestamp":1747895170000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":41,"title":["Cyanobenzene\u2010Modified Quinoxaline\u2010Based Acceptors with Optimal Excitonic Behavior Enable Efficient Organic Solar Cells"],"prefix":"10.1002","volume":"37","author":[{"given":"Xinya","family":"Ran","sequence":"first","affiliation":[{"name":"CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology  Beijing 100190 China"},{"name":"Sino\u2010Danish Center for Education and Research, Sino\u2010Danish College University 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