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However, during printed fabrication, the intrinsic coffee\u2010ring effect induces heterogeneous deposition of colloidal particles, leading to non\u2010uniform crystallization that critically limits the performance of large\u2010area devices. This issue not only complicates the crystallization dynamics of perovskite films but also impedes the development of a universal fluidic control strategy applicable across device scales. In this work, we harnessed the mechanisms of coffee\u2010ring formation and employed rapid drying combined with droplet fragmentation to construct a size\u2010tunable flow\u2010locking network at the buried interface. This network effectively confines the disordered migration of perovskite colloidal particles throughout the flowing and drying stages, suppressing the formation of macroscopic coffee rings and mitigating their detrimental impact on device crystallization and performance. As a result, the optimized PSCs deliver a high power conversion efficiency (PCE) of 26.61%, while a large\u2010area module (100 cm\n                    <jats:sup>2<\/jats:sup>\n                    ) maintains an impressive PCE of 21.39%, demonstrating excellent scalability and device uniformity.\n                  <\/jats:p>","DOI":"10.1002\/adma.202518582","type":"journal-article","created":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T14:34:36Z","timestamp":1767882876000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Coffee\u2010Ring\u2010Engineered Interfacial Layer Enables Fluid\u2010Locking for Scalable Perovskite Photovoltaics"],"prefix":"10.1002","volume":"38","author":[{"given":"Chenxiang","family":"Gong","sequence":"first","affiliation":[{"name":"College of Chemistry and Chemical Engineering\/Film Energy Chemistry for Jiangxi Provincial Key Laboratory\/Institute of Polymers and Energy Chemistry 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