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Herein, a novel strategy of 4\u2010hydroxybenzoic acid (4\u2010HBA) is developed to regulate the crystallization dynamics of perovskite. In situ cross\u2010linking network of 4\u2010HBA provided an excellent formwork for high\u2010quality perovskite growth by controlling excessive nucleation and prolonging crystallization. Grain boundary defects, residual stress, and Young's modulus of the perovskite film are greatly decreased. The dynamic hydrogen bonds between free hydroxyl groups and carboxyl groups\/halogen enhanced the self\u2010healing ability of perovskite film. The electrostatic interaction between the benzene ring of 4\u2010HBA and uncoordinated Pb\u00b2\u207a, coupled with \u03c0\u2010\u03c0 stacking of 4\u2010HBA, enhanced the conductivity of perovskite film. As a result, the optimal power conversion efficiency (PCE) of rigid perovskite solar cells (PSCs) and FPSCs reached 24.76% and 22.73%, respectively. The FPSCs retained 91% of initial efficiency after 10\u00a0000 bending cycles at 5 mm radius. The FPSCs after 4000 bends at 2 mm radius, regained 89% original PCE with 60\u2103 heating. The unencapsulated FPSCs retained 83% original PCE after 1000 h of Air Mass 1.5 Global illumination. This work offered an efficient strategy for high\u2010efficiency and robust FPSCs.<\/jats:p>","DOI":"10.1002\/advs.202508253","type":"journal-article","created":{"date-parts":[[2025,7,21]],"date-time":"2025-07-21T10:25:15Z","timestamp":1753093515000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["In Situ Polymerization Controlled Growth of Perovskite via Benzoic Acid Crosslinking Agent for Highly Efficient and Mechanically Robust Flexible Perovskite Solar Cell"],"prefix":"10.1002","volume":"12","author":[{"given":"Yankun","family":"Yang","sequence":"first","affiliation":[{"name":"College of Physics and Optoelectronics Engineering Shanxi Key Lab of Photovoltaic Technology and Application Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology  Taiyuan 030024 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Na","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Physics and Optoelectronics Engineering Shanxi Key Lab of Photovoltaic Technology and Application Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology  Taiyuan 030024 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenxi","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Physics and Optoelectronics Engineering Shanxi Key Lab of Photovoltaic Technology and Application Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology  Taiyuan 030024 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiqi","family":"Li","sequence":"additional","affiliation":[{"name":"College of Physics and Optoelectronics Engineering Shanxi Key Lab of Photovoltaic Technology and Application Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology  Taiyuan 030024 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Hao","sequence":"additional","affiliation":[{"name":"College of Physics and Optoelectronics Engineering Shanxi Key Lab of Photovoltaic Technology and Application Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology  Taiyuan 030024 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinjun","family":"Sun","sequence":"additional","affiliation":[{"name":"College of Physics and Optoelectronics Engineering Shanxi Key Lab of Photovoltaic Technology and Application Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology  Taiyuan 030024 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhihui","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Physics and Optoelectronics Engineering Shanxi Key Lab of Photovoltaic Technology and Application Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology  Taiyuan 030024 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shengzhong (Frank)","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University  Xi'an 710119 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fei","family":"Guo","sequence":"additional","affiliation":[{"name":"Institute of New Energy Technology College of Physics &amp; 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