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However, substantial temperature fluctuations during device operation generate mechanical stresses that, coupled with insufficient adhesion at the perovskite\/hole transport layer (HTL) interface, induce perovskite cracking and interfacial delamination. These structural degradations hinder efficient hole extraction and compromise long\u2010term device stability. In this study, we introduce 1,2\u2010ethylenediphosphonic acid (EDPA) as an interfacial molecular bridge to reconstruct the contact interface between the perovskite and HTL. The terminal phosphonic acid groups of EDPA simultaneously anchored to poly(3,4\u2010ethylenedioxythiophene)(styrenesulfonate) (PEDOT:PSS) and coordinated with B\u2010site metal ions in the perovskite, enhancing interfacial adhesion and generating pre\u2010compressive stress during film formation, effectively counteracting thermally induced tensile stress during device operation. Concurrently, EDPA disrupts the intrinsic electrostatic interactions within HTL via hydrogen\u2010bonding interactions, facilitating the segregation of insulating PSS chains, exposing the conductive PEDOT network, and reconstructing a more efficient hole\u2011extraction interface. Given these synergistic mechanical and electrical enhancements, the optimized PSC achieves a 23.96% power conversion efficiency (PCE), retaining 90.4% of its initial efficiency after 1200\u00a0h of thermal cycling (25\u00b0C\u201385\u00b0C). This study establishes a buried\u2010interface reconstruction strategy for realizing thermomechanically robust Sn\u2013Pb perovskite photovoltaics under practical operating conditions.<\/jats:p>","DOI":"10.1002\/anie.7907592","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T15:34:30Z","timestamp":1790004870000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Bidentate Phosphonate Bridges Enable Buried Interface Reconstruction for Thermomechanically Robust Sn\u2013Pb Perovskite Solar Cells"],"prefix":"10.1002","author":[{"given":"Mingjun","family":"Ma","sequence":"first","affiliation":[{"name":"State Key Laboratory of Advanced Optical Polymer and Manufacturing Technology College of Chemistry and Molecular Engineering Qingdao University of Science and Technology  Qingdao P. R. 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