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Herein, two new small molecule acceptors\u00a0(SMAs) Y6\u2010Ph and L8\u2010Ph are synthesized by introducing a phenyl end group in the inner side chains of the SMAs of Y6 and L8\u2010BO, respectively, for overcoming the excessive aggregation of SMAs in the long\u2010time film forming processed by nonhalogenated solvents. First, the effect of the film forming time on the aggregation property and photovoltaic performance of Y6, L8\u2010BO, Y6\u2010Ph, and L8\u2010Ph is studied by using the commonly used solvents: chloroform (CF) (rapid film forming process) and chlorobenzene (CB) (slow film forming process). It is\u00a0found that Y6\u2010 and L8\u2010BO\u2010based OSCs exhibit a dramatic drop in PCE\u00a0from CF\u2010 to CB\u2010processed devices owing to the large phase separation, while the Y6\u2010Ph and L8\u2010Ph based OSCs show obviously increased PCEs Furthermore, L8\u2010Ph\u2010based OSCs processed by nonhalogenated solvent\n                    <jats:italic>o<\/jats:italic>\n                    \u2010xylene (\n                    <jats:italic>o<\/jats:italic>\n                    \u2010XY) achieved a high PCE of 18.40% with an FF of 80.11%. The results indicate that introducing a phenyl end group in the inner side chains is an effective strategy to modulate the morphology and improve the photovoltaic performance of the OSCs processed by nonhalogenated solvents.\n                  <\/jats:p>","DOI":"10.1002\/adma.202302946","type":"journal-article","created":{"date-parts":[[2023,7,29]],"date-time":"2023-07-29T15:43:35Z","timestamp":1690645415000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":95,"title":["Introducing a Phenyl End Group in the Inner Side Chains of A\u2010DA'D\u2010A Acceptors Enables High\u2010Efficiency Organic Solar Cells Processed with Nonhalogenated Solvent"],"prefix":"10.1002","volume":"35","author":[{"given":"Xiangxi","family":"Wu","sequence":"first","affiliation":[{"name":"Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences  Beijing 100190 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