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To address this challenge, a dual\u2010interface Pb\u2010management approach enabled by custom\u2010designed chelating molecules is introduced. These tailored chelators are engineered with high Pb\n                    <jats:sup>2+<\/jats:sup>\n                    affinity and controlled coordination geometry, allowing them to suppress Pb\u2010related defect formation, promote vertical grain growth, and release residual lattice stress. When synergistically forming an internal encapsulation layer on both sides of the perovskite film with chitosan (CS), it supports efficient charge transport and enhances structural integrity. This configuration reduces Pb leakage to 0.86\u00a0ppm after 9 h immersion in pure water, which is below wastewater discharge limits, and efficiently mitigates Pb\u2010induced biotoxicity. Adopting this strategy p\u2010i\u2010n devices maintain 96% of initial performance after 3000 h of exposure and reach a champion efficiency of 26.91% (third\u2010party certified efficiency 26.60%). The unverified efficiency of n\u2010i\u2010p devices reached 25.60%. The strategy is applicable to both p\u2010i\u2010n and n\u2010i\u2010p device architectures and may be extendable to other Pb\u2010based perovskite systems.\n                  <\/jats:p>","DOI":"10.1002\/adma.75164","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T05:34:32Z","timestamp":1791264872000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Efficient Perovskite Solar Cells Based on Dual\u2010Interface \u201cGreen\u201d Lead Management"],"prefix":"10.1002","author":[{"given":"Fancong","family":"Zeng","sequence":"first","affiliation":[{"name":"State Key Laboratory Of Integrated Optoelectronics College of Electronic Science and Engineering College of Integrated Circuits Jilin University  Changchun P. R. China"},{"name":"School of Physics and Electronic Engineering Qilu Normal University Jinan P. R. 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