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Herein, we report a molecular design strategy that harnesses luminescent\u2010carbazole linkage site isomerism to suppress non\u2010radiative recombination. Two carbazole\u2010functionalized NFAs, QxCz\u2011C and QxCz\u2011N, were designed and synthesized. Theoretical calculations reveal that QxCz\u2011C adopts a coplanar conformation, whereas the carbazole unit in QxCz\u2011N is oriented nearly perpendicular to the main chain. Upon incorporating QxCz\u2011C as a minor guest into the host material BTP\u2011eC9, a favorable mixed phase is formed, accompanied by efficient energy transfer from the guest to the host. The photoluminescence quantum yield of the blend acceptor is significantly enhanced, effectively suppressing electron\u2011phonon coupling, thereby reducing non\u2011radiative recombination loss and improving\n                    <jats:italic>V<\/jats:italic>\n                    <jats:sub>oc<\/jats:sub>\n                    . Simultaneously, guest incorporation optimizes molecular packing order and active layer morphology, facilitating exciton dissociation and charge transport. Consequently, the PM6:BTP\u2011eC9:QxCz\u2011C device achieves a PCE of 20.53%. The generality of this strategy is further validated in the D18:L8\u2011BO system, delivering an excellent PCE of 21.10%. This work establishes a quantitative \u201cconnectivity topology\u2013molecular conformation\u2013non\u2010radiative loss\u201d structure\u2013property relationship and provides a generalizable approach to overcoming the voltage bottleneck in OSCs.\n                  <\/jats:p>","DOI":"10.1002\/adma.73788","type":"journal-article","created":{"date-parts":[[2026,6,23]],"date-time":"2026-06-23T17:08:48Z","timestamp":1782234528000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Site\u2010Specific Carbazole\u2010Bridged Isomeric Guests Enable Organic Solar Cells with 21.10% Efficiency and Reduced Non\u2010Radiative Recombination"],"prefix":"10.1002","volume":"38","author":[{"given":"Guangkuo","family":"Dai","sequence":"first","affiliation":[{"name":"State Key Laboratory of Bioinspired Interfacial Materials Science International Research Center For Carbon Neutralization Hangzhou International Innovation Institute Beihang University  Hangzhou P. 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