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However, the precise isomerization of dimeric acceptors and their effect on optoelectronic and photovoltaic properties have been rarely studied. Herein, four isomeric wing\u2010typed dimeric acceptors (named Dimer\u20101, Dimer\u20102, Dimer\u20103, and Dimer\u20104) with an alkylated linker are developed to investigate how different conjugated\u2010sites of end\u2010groups (methoxy\u2010substituted EG1 and methoxy\u2010free EG2) manipulate molecular packing and optoelectronic properties. Among them, Dimer\u20102, with two inside EG1 and two outside EG2 groups, show superior molecular packing, crystallinity, and photoluminescence. Therefore, the PM6:Dimer\u20102\u2010based OSC achieves a higher PCE of 15.12% with obviously boosted photovoltage and fill factor, mainly due to its optimized morphology and reduced energy loss. Building on this success, Dimer\u20102 is introduced into the classic PM6:BTP\u2010eC9 and D18:L8\u2010BO pairs to prepare ternary systems with complementary absorption and favorable vertical phase distribution, leading to impressive PCEs of 20.06% and 20.32%, respectively. Notably, 20.32% efficiency is the highest value among ternary OSCs with non\u2010fully conjugated dimeric acceptors. This work indicates that the precise isomerization of end\u2010group conjugated\u2010sites is a feasible approach to developing high\u2010performance dimeric acceptors and constructing efficient OSCs.<\/jats:p>","DOI":"10.1002\/anie.1052031","type":"journal-article","created":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T12:12:58Z","timestamp":1784117578000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Precise End\u2010Group Conjugated\u2010Site Isomerization of Wing\u2010Typed Dimeric Acceptors Enables 20.32% Efficiency Organic Solar Cells"],"prefix":"10.1002","volume":"65","author":[{"given":"Long","family":"Jiang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Oil and Gas Equipment CNPC Tubular Goods Research Institute  Xi'an China"},{"name":"Shaanxi Provincial Key Laboratory of Clean Energy Equipment and Materials  Xi'an 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