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However, thicker layers often result in lower efficiency. This study tackles this challenge using a polymer adsorption strategy combined with a layer\u2010by\u2010layer approach. Incorporating insulator polystyrene (PS) into the PM6:L8\u2010BO system creates PM6+PS:L8\u2010BO blends, effectively suppressing trap states and extending exciton diffusion length in the mixed donor domain. Adding insulating polymers with benzene rings to the donor enhances \u03c0\u2013\u03c0 stacking of donors, boosting intermolecular interactions and electron wave function overlap. This results in more orderly molecular stacking, longer exciton lifetimes, and higher diffusion lengths. The promoted long\u2010range exciton diffusion leads to high power conversion efficiencies of 19.05% and 18.15% for PM6+PS:L8\u2010BO blend films with 100 and 300\u00a0nm thickness, respectively, as well as a respectable 16.00% for 500\u00a0nm. These insights guide material selection for better exciton diffusion, and offer a method for thick\u2010film OSC fabrication, promoting a prosperous future for practical OSC mass production.<\/jats:p>","DOI":"10.1002\/adma.202313532","type":"journal-article","created":{"date-parts":[[2024,2,22]],"date-time":"2024-02-22T11:48:56Z","timestamp":1708602536000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":145,"title":["\u03c0\u2013\u03c0 Stacking Modulation via Polymer Adsorption for Elongated Exciton Diffusion in High\u2010Efficiency Thick\u2010Film Organic Solar Cells"],"prefix":"10.1002","volume":"36","author":[{"given":"Zhen","family":"Fu","sequence":"first","affiliation":[{"name":"School of Physics State Key Laboratory of Crystal Materials Shandong University  Jinan Shandong 250100 P. R. 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