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Although conventional hydrophobic interlayers can block water, they are generally incompatible with polar perovskite precursor solutions and are thus unsuitable for use beneath perovskite films. Here, a self\u2010healing hydrophobic coating (SHC) is introduced that integrates a supramolecular polymer with dynamic imine cross\u2010linking and SiO\n                    <jats:sub>2<\/jats:sub>\n                    nanoparticles as a buried interfacial barrier. The SHC combines strong hydrophobicity, a low water vapor transmission rate, and exceptional self\u2010healing ability, preserving its protective function even after surface treatment and perovskite deposition. Beyond suppressing moisture permeation, the SHC interacts with PbI\n                    <jats:sub>2<\/jats:sub>\n                    to modulate the orientation of PbI\n                    <jats:sub>2<\/jats:sub>\n                    layers, thus directing perovskite crystallization toward compact stacking, reduced residual PbI\n                    <jats:sub>2<\/jats:sub>\n                    , and preferential crystal orientation. Consequently, SHC\u2010modified flexible pero\u2010SCs achieve a record efficiency of 26.38% (25.74% certified) and 24.80% for small\u2010area (0.062 cm\n                    <jats:sup>2<\/jats:sup>\n                    ) and large\u2010area (1.004 cm\n                    <jats:sup>2<\/jats:sup>\n                    ) devices. The devices also demonstrate outstanding stability, maintaining 81.18% of their initial efficiency after 1000\u00a0h at 85% relative humidity and passing the IPX7 waterproofing standard under complete immersion.\n                  <\/jats:p>","DOI":"10.1002\/adma.202519163","type":"journal-article","created":{"date-parts":[[2025,12,8]],"date-time":"2025-12-08T07:40:27Z","timestamp":1765179627000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Self\u2010Healing Hydrophobic Buried Interfaces for Achieving Moisture\u2010Resistant Flexible Perovskite Solar Cells with 26.38% Efficiency"],"prefix":"10.1002","volume":"38","author":[{"given":"Wen","family":"Liu","sequence":"first","affiliation":[{"name":"Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor\u2010optoelectronics Materials and Devices State Key Laboratory of Bioinspired Interfacial Materials Science College of 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