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In this work, quinoxaline\u2010based NFAs are designed and synthesized using a synergistic isomerization and bromination approach. The \u03c0\u2010expanded quinoxaline\u2010fused core exhibits different bromination sites for isomeric NFAs, namely AQx\u201021 and AQx\u201022. Theoretical and experimental analyses reveal that the isomerization effect of core bromination significantly influences molecular intrinsic properties, including electrostatic potentials, polarizability, dielectric constant, exciton binding energy, crystallinity, and miscibility with donor materials, thereby improving molecular packing and bulk\u2010heterojunction morphology. Consequently, the AQx\u201022\u2010based blend exhibits enhanced crystallinity, reduced domain size, and optimized phase distribution, which facilitates charge transport, suppresses charge recombination, and improves charge extraction. The AQx\u201022\u2010treated OSCs obtain an impressive efficiency of 19.5% with a remarkable open\u2010circuit voltage of 0.970\u00a0V and a low\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>loss<\/jats:sub>\n                    of 0.476\u00a0eV. This study provides deep insights into NFA design and elucidates the potential working mechanisms for optimizing morphology and device performance through isomerization engineering of core bromination, highlighting its significance in advancing OSC technology.\n                  <\/jats:p>","DOI":"10.1002\/adma.202413376","type":"journal-article","created":{"date-parts":[[2024,12,30]],"date-time":"2024-12-30T08:35:27Z","timestamp":1735547727000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":48,"title":["The Critical Isomerization Effect of Core Bromination on Nonfullerene Acceptors in Achieving High\u2010Performance Organic Solar Cells with Low Energy Loss"],"prefix":"10.1002","volume":"37","author":[{"given":"Kerui","family":"Liu","sequence":"first","affiliation":[{"name":"Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry, 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