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Here, a practical internal\u2010capsulation strategy is proposed by introducing cross\u2010linkable methacrylate analogs upon the perovskite layer, hindering ion migration and preventing lead leakage to achieve stable PerSCs. Butyl methacrylate (UMA) and benzyl methacrylate (BMA) can chemically interact with the perovskite layer, especially for the BMA dimer with significant \u03c0\u2010interactions among the hanging benzene rings. Such configuration facilitated more compact coordination, thereby restoring the Fermi level of perovskite to a defect\u2010free state and reducing carrier recombination losses. Moreover, by integrating the self\u2010cross\u2010linking and intermolecular \u03c0\u2010effect, the application of BMA upgraded the internal capsulation from linear protection to a compact mesh\u2010like scale. Consequently, the application of BMA not only boosted the efficiency to 25.31% but also greatly enhanced the stability of the perovskite layer, especially for water resistance and preventing lead linkage. The internal capsulation strategy upgrading from linear to mesh\u2010like marked an innovative direction in protecting the perovskite layer, paving the way for more sustainable PerSCs in further application.<\/jats:p>","DOI":"10.1002\/adma.202410425","type":"journal-article","created":{"date-parts":[[2024,10,14]],"date-time":"2024-10-14T13:44:33Z","timestamp":1728913473000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Internal Capsulation Via Self\u2010Cross\u2010linking and \u03c0\u2010Effects Achieves Highly Stable Perovskite Solar Cells"],"prefix":"10.1002","volume":"36","author":[{"given":"Zongzhi","family":"Yang","sequence":"first","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuling","family":"Zhang","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangzheng","family":"Wu","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuang","family":"Li","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhangwei","family":"He","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miaoning","family":"Ou","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haoyu","family":"Yuan","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuai","family":"Li","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Han","family":"Zhu","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6482-4314","authenticated-orcid":false,"given":"Runnan","family":"Yu","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2700-4725","authenticated-orcid":false,"given":"Zhan'ao","family":"Tan","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,10,14]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566-022-00985-1"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41560-019-0538-4"},{"key":"e_1_2_7_3_1","volume":"131","author":"Kojima A.","year":"2009","journal-title":"J. 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