{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T20:22:23Z","timestamp":1789676543972,"version":"4.0.1"},"reference-count":56,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2025,12,26]],"date-time":"2025-12-26T00:00:00Z","timestamp":1766707200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,12,26]],"date-time":"2025-12-26T00:00:00Z","timestamp":1766707200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100008416","name":"Wuhan National Laboratory for Optoelectronics","doi-asserted-by":"publisher","award":["2023WNLOKF012"],"award-info":[{"award-number":["2023WNLOKF012"]}],"id":[{"id":"10.13039\/501100008416","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100020593","name":"Fundamental Research Funds for the Central Universities of Beijing University of Chemical Technology","doi-asserted-by":"publisher","award":["buctrc201828"],"award-info":[{"award-number":["buctrc201828"]}],"id":[{"id":"10.13039\/100020593","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100020593","name":"Fundamental Research Funds for the Central Universities of Beijing University of Chemical Technology","doi-asserted-by":"publisher","award":["XK1802\u20102"],"award-info":[{"award-number":["XK1802\u20102"]}],"id":[{"id":"10.13039\/100020593","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52473165"],"award-info":[{"award-number":["52473165"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["22475013"],"award-info":[{"award-number":["22475013"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    High binding energy of localized\n                    <jats:italic>Frenkel<\/jats:italic>\n                    excitons (\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>b<\/jats:sub>\n                    ) in organic semiconductors has fundamentally limited the development of homo\u2010junction organic solar cells (HJ\u2010OSCs). Although non\u2010fullerene acceptors (e.g., Y\u2010acceptors) exhibit intrinsically low\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>b<\/jats:sub>\n                    due to their unique molecular quadrupole moments and packing motifs\u2014enabling an internal electrostatic field for exciton dissociation\u2014their inefficient exciton dissociation and unbalanced charge transport have constrained HJ\u2010OSC efficiencies to approximately 4%. Herein, we report a record power conversion efficiency (PCE) of 5.07% in Y\u2010acceptor\u2010based HJ\u2010OSCs achieved through side\u2010chain engineering that effectively reduces\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>b<\/jats:sub>\n                    value. By systematically modulating the alkyl side chains of Y\u2010acceptors into three derivatives\u2014Y6\u2010EE, Y6\u2010EH (pristine Y6), and Y6\u2010BO\u2014we demonstrate that the compact 2\u2010ethylethyl chain in Y6\u2010EE induces denser molecular packing, enhances molecular polarization, and increases dielectric permittivity. These synergistic effects collectively reduce\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>b<\/jats:sub>\n                    and accelerate charge generation kinetics. Consequently, Y6\u2010EE\u2010based HJ\u2010OSCs achieve a remarkable short\u2010circuit current density (\n                    <jats:italic>J<\/jats:italic>\n                    <jats:sub>SC<\/jats:sub>\n                    ) of 10.62\u00a0mA\/cm\n                    <jats:sup>2<\/jats:sup>\n                    and a record PCE of 5.07%, substantially outperforming devices based on Y6\u2010EH and Y6\u2010BO. This work highlights the critical role of side\u2010chain topology in regulating exciton thermodynamics and charge generation efficiency, providing a rational molecular design strategy for high\u2010performance HJ\u2010OSCs.\n                  <\/jats:p>","DOI":"10.1002\/smll.202513943","type":"journal-article","created":{"date-parts":[[2025,12,26]],"date-time":"2025-12-26T09:44:42Z","timestamp":1766742282000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Side\u2010Chain Controlled Exciton Binding Energy in Y\u2010Acceptors Toward Homo\u2010Junction Organic Solar Cells With 5.07% Efficiency"],"prefix":"10.1002","volume":"22","author":[{"given":"Haiyun","family":"Fan","sequence":"first","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering &amp; State Key Laboratory of Organic\u2010Inorganic Composites Beijing University of Chemical Technology  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7253-7136","authenticated-orcid":false,"given":"Chengyi","family":"Xiao","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering &amp; State Key Laboratory of Organic\u2010Inorganic Composites Beijing University of Chemical Technology  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haisheng","family":"Fang","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering &amp; State Key Laboratory of Organic\u2010Inorganic Composites Beijing University of Chemical Technology  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Doan","family":"Vu","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Monash University  Victoria 3800 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengcheng","family":"Xie","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering &amp; State Key Laboratory of Organic\u2010Inorganic Composites Beijing University of Chemical Technology  Beijing P. R. China"},{"name":"Engineering Research Center for Energy Conversion and Storage Technology of Guizhou School of Chemistry and Chemical Engineering Guizhou University  Guiyang P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linhu","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Information Photonic and Optical Communications Beijing University of Posts and Telecommunications (BUPT)  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Information Photonic and Optical Communications Beijing University of Posts and Telecommunications (BUPT)  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Menglan","family":"Lv","sequence":"additional","affiliation":[{"name":"Engineering Research Center for Energy Conversion and Storage Technology of Guizhou School of Chemistry and Chemical Engineering Guizhou University  Guiyang P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher R.","family":"McNeill","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Monash University  Victoria 3800 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7329-4236","authenticated-orcid":false,"given":"Weiwei","family":"Li","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering &amp; State Key Laboratory of Organic\u2010Inorganic Composites Beijing University of Chemical Technology  Beijing P. R. 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