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However, high\u2010efficiency OSCs that possess all these advantages remain scarce due to the lack of insight into the structure\u2010property relationship. In this work, three fully non\u2010fused ring electron acceptors (NFREAs), DTB21, DTB22, and DTB23, are reported by utilizing a simplified 1,4\u2010di(thiophen\u20102\u2010yl)benzene (DTB) core with varied alkoxy chain lengths on the thiophene bridge. The material\u2010only costs of these acceptors are only 11\u201313$ per gram. Importantly, DTB22 has an exciton diffusion length (<jats:italic>L<\/jats:italic><jats:sub>D<\/jats:sub>) of up to 25.5\u00a0nm. The DTB21 and DTB23 exhibit decreased <jats:italic>L<\/jats:italic><jats:sub>D<\/jats:sub>s of 20.1 and 23.1\u00a0nm, respectively. After blending with the polymer donor PBQx\u2010TF, the PBQx\u2010TF:DTB22 film exhibits the fastest hole transfer and the longest carrier recombination lifetime among these OSCs. Consequently, the optimal PBQx\u2010TF:DTB22\u2010based OSC achieves an excellent PCE of 17.00%, which is among the highest values for fully NFREAs. In contrast, the PBQx\u2010TF:DTB21\u2010 and PBQx\u2010TF:DTB23\u2010based OSCs show relatively lower PCEs of 15.13% and 15.63%, respectively. Notably, all these OSCs are fabricated using toluene as the solvent, without any additives. Additionally, the DTB22\u2010based OSC also demonstrates good stability, retaining 95% of its initial efficiency after 500 h without encapsulation in a glovebox.<\/jats:p>","DOI":"10.1002\/smll.202405525","type":"journal-article","created":{"date-parts":[[2024,10,31]],"date-time":"2024-10-31T08:50:47Z","timestamp":1730364647000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Fully Non\u2010Fused Ring Electron Acceptors Enable Effective Additive\u2010Free Organic Solar Cells with Enhanced Exciton Diffusion Length"],"prefix":"10.1002","volume":"20","author":[{"given":"Kun","family":"Li","sequence":"first","affiliation":[{"name":"Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University  Beijing 100048 P. R. 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