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A newly designed and synthesized iodinated non\u2010fullerene acceptor, BO\u20104I, showcases exceptional excitation delocalization property with the exciton diffusion length increased to 80\u2005nm. The enhanced electron delocalization property is attributed to the larger atomic radius and electron orbit of the iodine atom, which facilitates the formation of intra\u2010moiety excitations in the acceptor phase. This effectively circumvents the charge transfer state\u2010related recombination mechanisms, leading to a substantial reduction in non\u2010radiative energy loss (\u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>nr<\/jats:sub>\n                    ). As a result, OPV cell based on PBDB\u2010TF\u2009:\u2009BO\u20104I achieves an impressive efficiency of 18.9\u2009% with a notable \u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>nr<\/jats:sub>\n                    of 0.189\u2005eV, markedly surpassing their fluorinated counterparts. This contribution highlights the pivotal role of iodination in reducing energy loss, thereby affirming its potential as a key strategy in the development of advanced next\u2010generation OPV cells.\n                  <\/jats:p>","DOI":"10.1002\/anie.202317892","type":"journal-article","created":{"date-parts":[[2024,1,11]],"date-time":"2024-01-11T10:59:11Z","timestamp":1704970751000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":53,"title":["Iodinated Electron Acceptor with Significantly Extended Exciton Diffusion Length for Efficient Organic Photovoltaic Cells"],"prefix":"10.1002","volume":"63","author":[{"given":"Zhihao","family":"Chen","sequence":"first","affiliation":[{"name":"State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences  100190 Beijing 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