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Although most asymmetric NFAs focus on lateral (i.e., left\u2013right) asymmetry, out\u2010of\u2010plane anisotropy has remained underexplored, despite its ability to induce both a vertical dipole moment and molecular chirality, thereby potentially enabling functionalities such as chirality\u2010induced spin selectivity (CISS). With this perspective, we develop chiral and bifacial NFAs, (\n                    <jats:italic>S<\/jats:italic>\n                    ,\n                    <jats:italic>S<\/jats:italic>\n                    )\u2010IE4F, and (\n                    <jats:italic>R<\/jats:italic>\n                    ,\n                    <jats:italic>R<\/jats:italic>\n                    )\u2010IE4F, featuring an indacenodithiophene (IDT) core bearing a hydrophilic oligo(ethylene glycol) group and a hydrophobic phenyl group on the bridging sp\n                    <jats:sup>3<\/jats:sup>\n                    \u2010carbons. Their racemic counterpart (\n                    <jats:italic>rac<\/jats:italic>\n                    \u2010IE4F) and a non\u2010bifacial achiral isomer (\n                    <jats:italic>meso<\/jats:italic>\n                    \u2010IE4F) are also synthesized as the controls. Compared to\n                    <jats:italic>meso<\/jats:italic>\n                    \u2010IE4F, the bifacial isomers exhibit higher solubility, more favorable molecular packing for carrier transport, and larger dipole moments. Notably, neat (\n                    <jats:italic>S<\/jats:italic>\n                    ,\n                    <jats:italic>S<\/jats:italic>\n                    )\/(\n                    <jats:italic>R<\/jats:italic>\n                    ,\n                    <jats:italic>R<\/jats:italic>\n                    )\u2010IE4Fs and their bulk heterojunctions with PBDB\u2010T exhibit pronounced CISS effect, with spin polarizations of \u223c70% and \u223c50%, respectively. Consequently, OSCs based on homochiral bifacial IE4Fs achieve a power conversion efficiency of 8.17%, three times higher than that of\n                    <jats:italic>meso<\/jats:italic>\n                    \u2010IE4F. This study highlights the impact of isomerization in NFAs and provides a new molecular design strategy for homochiral asymmetric NFAs.\n                  <\/jats:p>","DOI":"10.1002\/anie.202518505","type":"journal-article","created":{"date-parts":[[2025,11,11]],"date-time":"2025-11-11T07:52:13Z","timestamp":1762847533000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Chiral Bifacial Non\u2010Fullerene Acceptors with Chirality\u2010Induced Spin Selectivity: A Homochiral Strategy to Improve Organic Solar Cell Performance"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-9143-6529","authenticated-orcid":false,"given":"Shuang","family":"Li","sequence":"first","affiliation":[{"name":"Department of Applied Chemistry Graduate School of Engineering Osaka University  2\u20101 Yamadaoka Suita Osaka 565\u20130871 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