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Through this approach, we successfully dissolved high molecular weight D18 in chloroform at 100\u2009\u00b0C within a pressure\u2010tight vial. The increased steam pressure raised the boiling point and dissolving capacity of chloroform, enabling the creation of a hybrid film with superior properties, including more ordered molecular arrangement, increased crystallinity, extended exciton diffusion length, and improved phase morphology. Organic solar cells (OSCs) based on D18\u2009:\u2009L8\u2010BO prepared using this high\u2010pressure method achieved an outstanding power conversion efficiency of 19.65\u2009%, setting a new record for binary devices to date. Furthermore, this high\u2010pressure method was successfully applied to fabricate OSCs based on other common systems, leading to significant enhancements in device performance. In summary, this research introduces a universal method for processing high molecular weight D18 materials, ultimately resulting in the highest performance reported for binary organic solar cells.<\/jats:p>","DOI":"10.1002\/anie.202314420","type":"journal-article","created":{"date-parts":[[2023,10,26]],"date-time":"2023-10-26T03:35:01Z","timestamp":1698291301000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":193,"title":["High\u2010Pressure Fabrication of Binary Organic Solar Cells with High Molecular Weight D18 Yields Record 19.65\u2009% Efficiency"],"prefix":"10.1002","volume":"62","author":[{"given":"Hao","family":"Lu","sequence":"first","affiliation":[{"name":"College of Materials Science and Engineering Qingdao University  Qingdao 266071 P. R. 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