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As promising flexible X\u2010ray detection materials, organic\u2010inorganic hybrid perovskites (OIHPs) offer significant advantages, including efficient X\u2010ray absorption, excellent charge transport, and cost\u2010effective processing. However, reported flexible OIHP\u2010based X\u2010ray detectors are predominantly limited to polycrystalline materials, which suffer from unavoidable grain boundaries, high defect densities, and poor charge mobility. Herein, we successfully fabricate flexible single\u2010crystal ferroelectric thin films for efficient self\u2010powered X\u2010ray detection. Specifically, leveraging the weak van der Waals interactions within the 2D perovskite layers of (benzylamine)\n                    <jats:sub>2<\/jats:sub>\n                    CsPb\n                    <jats:sub>2<\/jats:sub>\n                    Br\n                    <jats:sub>7<\/jats:sub>\n                    , high\u2010quality, flexible single\u2010crystal films are manufactured by mechanical exfoliation. Capitalizing on the intrinsic spontaneous polarization of ferroelectric photovoltaics, our flexible device demonstrates exceptional X\u2010ray sensitivity (693 \u00b5C Gy\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    ) under zero bias, along with stable output under 1000 bending cycles and different bending angles. As the first demonstration of non\u2010planar self\u2010powered X\u2010ray detection in flexible single\u2010crystal ferroelectric thin films, this work provides a foundation for future wearable X\u2010ray detection systems.\n                  <\/jats:p>","DOI":"10.1002\/anie.202516723","type":"journal-article","created":{"date-parts":[[2025,11,10]],"date-time":"2025-11-10T10:30:27Z","timestamp":1762770627000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Flexible Single\u2010Crystalline Perovskite Ferroelectric Thin Film for Efficient Self\u2010Driven X\u2010ray Detection"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-3749-7455","authenticated-orcid":false,"given":"Qianwen","family":"Guan","sequence":"first","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou Fujian 350002 P.R. 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