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Here, we introduce a \u03b2\u2010side\u2010chain\u2010free molecular design strategy that enables the preparation of two new Y6 derivatives, JSM5 and JSM6, with substantially reduced synthetic complexity and cost. Single\u2010crystal X\u2010ray analysis reveals an unusual tetrameric packing, originating from the removal of the \u03b2\u2010alkyl chains in the structure. Importantly, this packing unlocks multiple S\u00b7\u00b7\u00b7N intermolecular interactions between the benzothiadiazole cores, driving \u03b3\u2010shaped molecular conformations to establish efficient layer\u2010by\u2010layer 3D charge transport pathways and exhibit superior intermolecular connectivity. Consequently, remarkably high short\u2010circuit current densities (\n                    <jats:italic>J<\/jats:italic>\n                    <jats:sub>SC<\/jats:sub>\n                    s) of up to 28\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    are obtained, among the highest reported for Y\u2010series acceptors. PM6:JSM5 and PM6:JSM6 OSCs achieve power conversion efficiencies of 17.3% and 18.0%, respectively, comparable to the state\u2010of\u2010the\u2010art acceptors Y6 and BTP\u2010eC9, while reducing acceptor material cost by approximately threefold. Cost\u2013performance analysis further indicates that JSMs rank among the most cost\u2010effective fused\u2010ring acceptors within the evaluated set. This work not only introduces a new packing motif enabled by \u03b2\u2010side chain elimination but also establishes a promising molecular design framework for high\u2010\n                    <jats:italic>J<\/jats:italic>\n                    <jats:sub>SC<\/jats:sub>\n                    , cost\u2010effective fused\u2010ring acceptors, paving the path toward commercially realizable acceptor materials.\n                  <\/jats:p>","DOI":"10.1002\/advs.75738","type":"journal-article","created":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T13:56:14Z","timestamp":1779198974000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Side Chain Elimination Enables Low\u2010Cost Fused\u2010Ring Acceptors and Reveals a Compact Tetrameric Structure for High\u2010Photocurrent Organic Solar Cells"],"prefix":"10.1002","volume":"13","author":[{"given":"Jinhui","family":"Zhao","sequence":"first","affiliation":[{"name":"Flinders Institute for Nanoscale Science and Technology Flinders University  Adelaide Australia"},{"name":"Department of Chemistry and Chemical Engineering Chalmers University of Technology  Gothenburg Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi","family":"Wu","sequence":"additional","affiliation":[{"name":"Flinders Institute for Nanoscale Science and Technology Flinders University  Adelaide Australia"},{"name":"School of Materials Science and Engineering Zhengzhou University  Zhengzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Witold M.","family":"Bloch","sequence":"additional","affiliation":[{"name":"Flinders Institute for Nanoscale Science and Technology Flinders University  Adelaide Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caroline V. 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