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In particular, low-cost non-fused-ring electron acceptors (NFREAs) suffer from conformational disorder, limiting their photovoltaic performance. Herein, we strategically regulate conformational entropy (Sconf.) of NFREAs through the rational combination of intramolecular noncovalent interactions (INIs). The optimal candidate 3TT-SeS, identified through comprehensive density functional theory calculations, exhibits balanced Se\u00b7\u00b7\u00b7N and S\u00b7\u00b7\u00b7O INIs and demonstrates a significant reduction in Sconf. This strategy enables an exclusive single stable conformation and highly ordered molecular packing, thereby facilitating efficient charge transport. Consequently, the 3TT-SeS-based OSC achieved an outstanding power conversion efficiency of 19.26% (certified at 18.75%), setting a new benchmark for NFREA-based systems to date. More importantly, 3TT-SeS-based device demonstrates exceptional economic potential with an extremely low power generation cost of 0.77$ kW\u22121, much lower than several high-performance FREA-based systems. Our work demonstrates a low-Sconf. design of NFREAs for cost-effective and high-performance organic photovoltaics.<\/jats:p>","DOI":"10.1093\/nsr\/nwag177","type":"journal-article","created":{"date-parts":[[2026,3,18]],"date-time":"2026-03-18T12:56:33Z","timestamp":1773838593000},"source":"Crossref","is-referenced-by-count":8,"title":["Conformational entropy tuning in nonfused-ring electron acceptors for low-cost and record-efficiency organic solar cells"],"prefix":"10.1093","volume":"13","author":[{"given":"Xiaobin","family":"Gu","sequence":"first","affiliation":[{"name":"College of Materials Science and Opto-Electronic Technology, Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences , Beijing 101408 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Zeng","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering, Frontiers Science Center for 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