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In this work, a small molecule acceptor, SC8\u2010IT4F, is developed through outer side chain engineering on the terminal thiophene of a conjugated 6,12\u2010dihydro\u2010dithienoindeno[2,3\u2010d:2\u2032,3\u2032\u2010d\u2032]\u2010s\u2010indaceno[1,2\u2010b:5,6\u2010b\u2032]dithiophene (IDTT) central core. Compared to the reference molecule C8\u2010IT4F, which lacks outer side chains, SC8\u2010IT4F displays notable differences in molecule geometry (as shown by simulations), thermal behavior, single\u2010crystal packing, and film morphology. Blend films of SC8\u2010IT4F and the polymer donor PM6 exhibit larger carrier mobilities, longer carrier lifetimes, and reduced recombination compared to C8\u2010IT4F, resulting in improved device performance. Binary photovoltaic devices based on the PM6:SC8\u2010IT4F films reveal an optimal efficiency over 15%, which is one of the best values for non\u2010Y type small molecule acceptors (SMAs). The resultant devices also show better thermal and operational stability than the control PM6:L8\u2010BO devices. SC8\u2010IT4F and its blend exhibit a higher relative degree of crystallinity and \u03c0 coherence length, compared to C8\u2010IT4F samples, beneficial for charge transport and device performance. The results indicate that outer side chain engineering on existing small electron acceptors can be a promising molecular design strategy for further pursuing high\u2010performance organic solar cells.<\/jats:p>","DOI":"10.1002\/advs.202414042","type":"journal-article","created":{"date-parts":[[2025,1,22]],"date-time":"2025-01-22T06:02:48Z","timestamp":1737525768000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Significant Efficiency Enhancements in Non\u2010Y Series Acceptors by the Addition of Outer Side Chains"],"prefix":"10.1002","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9383-9387","authenticated-orcid":false,"given":"Qiao","family":"He","sequence":"first","affiliation":[{"name":"Department of Chemistry and Centre for Processable Electronics Imperial College London  London W12 0BZ UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wisnu Tantyo","family":"Hadmojo","sequence":"additional","affiliation":[{"name":"Division of Physical Sciences and Engineering King Abdullah University of Science and Technology and KAUST Solar Center  Thuwal 23955\u20106900 Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiantao","family":"Hu","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Centre for Processable Electronics Imperial College London  London W12 0BZ UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Subhrangsu","family":"Mukherjee","sequence":"additional","affiliation":[{"name":"Department of Physics and Organic and Carbon Electronics Laboratories (ORaCEL) North Carolina State University  Raleigh NC 27695 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maryam","family":"Alqurashi","sequence":"additional","affiliation":[{"name":"Division of Physical Sciences and Engineering King Abdullah University of Science and Technology and KAUST Solar Center  Thuwal 23955\u20106900 Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wejdan","family":"Althobaiti","sequence":"additional","affiliation":[{"name":"Division of Physical Sciences and Engineering King Abdullah University of Science and Technology and KAUST Solar Center  Thuwal 23955\u20106900 Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Catherine S. 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