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Based on M-series acceptors featuring an acceptor-donor-acceptor (A-D-A)-type framework, we report two dimerized NFAs (DM-8F and DM-8Cl) containing different halogen atoms in their terminal groups. Compared to the small-molecule acceptor M68, both dimerized acceptors exhibit increased glass transition temperatures and enlarged dielectric constants. The choice of halogen atoms in the terminal groups significantly affects their \u03c0\u2013\u03c0-packing distances, exciton diffusion lengths, and ultimately, photovoltaic performance. Owing to enhanced charge transport, reduced exciton binding energy, and extended exciton diffusion length, DM-8F achieves an efficiency of 19.39% (certified at 19.20%) in small-area polymer solar cells (PSCs) and 15.72% in minimodules with an effective area of 11.09 cm2. These efficiencies are the highest reported to date among all A-D-A-type NFAs. Moreover, DM-8F\u2013based devices exhibit significantly improved thermal and photostability compared to those based on M68.<\/jats:p>","DOI":"10.1093\/nsr\/nwaf537","type":"journal-article","created":{"date-parts":[[2025,11,26]],"date-time":"2025-11-26T13:08:18Z","timestamp":1764162498000},"source":"Crossref","is-referenced-by-count":12,"title":["Prolonged exciton lifetime\n                    <i>via<\/i>\n                    conjugation-length engineering in M-series acceptors for 19.39% efficiency polymer solar cells"],"prefix":"10.1093","volume":"13","author":[{"given":"Wenxiong","family":"Shen","sequence":"first","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry, College of Engineering and Applied Sciences, Nanjing University , Nanjing 210023 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoying","family":"Xiong","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry, College of 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