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Reports on non\u2010fused\u2010ring polymer acceptors as the third component to regulate active layer crystallinity are scarce. In this work, we report a simple benzene\u2010based non\u2010fused\u2010ring polymer acceptor (PW1) and introduce it into the PM6:BTP\u2010eC9 system. PW1 exhibits good thermal stability (\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>d<\/jats:sub>\n                    = 343\u00b0C), excellent miscibility with the host binary blend, cascaded energy level alignment, and complementary absorption. Electrostatic potential (ESP) calculations indicate that PW1 has a smaller ESP value than BTP\u2010eC9, acts as a compatibility modifier in the PM6:BTP\u2010eC9 system. In situ UV\u2013vis absorption results demonstrate that PW1 suppresses BTP\u2010eC9 aggregation, retards its precipitation and crystallization during film formation, and forms an appropriate phase separation size. The ternary device with 3\u00a0wt.% PW1 achieves a high PCE of 19.50% (higher than the 18.61% of the binary device), along with a high fill factor (FF) of 80.45%. The ternary system shows faster charge extraction, longer carrier lifetimes, higher and more balanced carrier mobilities, and less charge recombination. Additionally, it displays better storage stability with the\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>80<\/jats:sub>\n                    lifetime extended from 415 to 983\u00a0h.\n                  <\/jats:p>","DOI":"10.1002\/smll.202514335","type":"journal-article","created":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T19:19:43Z","timestamp":1771442383000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Regulating Crystallization Behavior via Non\u2010Fused\u2010Ring Polymer Acceptor for High Performance Ternary Organic Solar Cells"],"prefix":"10.1002","volume":"22","author":[{"given":"Tingting","family":"Wang","sequence":"first","affiliation":[{"name":"College of Chemistry and Chemical Engineering\/Film Energy Chemistry For Jiangxi Provincial Key Laboratory (FEC)\/Institute of Polymers and Energy Chemistry (IPEC) Nanchang University  Nanchang 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(FEC)\/Institute of Polymers and Energy Chemistry (IPEC) Nanchang University  Nanchang China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8796-4106","authenticated-orcid":false,"given":"Zhongyi","family":"Yuan","sequence":"additional","affiliation":[{"name":"College of Chemistry and Chemical Engineering\/Film Energy Chemistry For Jiangxi Provincial Key Laboratory (FEC)\/Institute of Polymers and Energy Chemistry (IPEC) Nanchang University  Nanchang 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