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Here we establish a chirality\u2010modulated spin\u2010engineering strategy that intrinsically overcomes these limitations by quantitatively linking molecular chirality, Rashba spin splitting, carrier transport, and detector performance in a chiral Bi\/Sb metal\u2010halide hybrid series, (\n                    <jats:italic>S<\/jats:italic>\n                    <jats:sub>1\u2212r<\/jats:sub>\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sub>r<\/jats:sub>\n                    \u2010CHEA)\n                    <jats:sub>4<\/jats:sub>\n                    (Bi\n                    <jats:sub>0.5<\/jats:sub>\n                    Sb\n                    <jats:sub>0.5<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    I\n                    <jats:sub>10<\/jats:sub>\n                    (CHEA\u00a0=\u00a01\u2010cyclohexylethylamine), where the enantiomeric ratio functions as a continuous structural control parameter. Homochiral assemblies maximize inversion\u2010symmetry breaking, producing a giant Rashba coefficient up to 0.41\u00a0eV \u00c5\n                    <jats:sup>\u22121<\/jats:sup>\n                    and enabling long\u2010lived (&gt; 1\u00a0ns) spin polarization that suppresses excitonic localization. As a result, the exciton binding energy decreases by 42% while the carrier mobility\u2013lifetime product (\n                    <jats:italic>\u03bc\u03c4<\/jats:italic>\n                    ) increases fourfold, establishing an intrinsic spin\u2010modulated transport mechanism in lead\u2010free metal\u2010halide hybrids. Flexible detectors fabricated from the optimized homochiral composition exhibit deformation\u2010invariant x\u2010ray imaging with a record sensitivity of 8002\u00a0\u00b5C\u00a0Gy\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    , an ultralow detection limit of 75\u00a0nGy\u00a0s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , and exceptional robust endurance under couples of stresses including thermal, humidity, mechanical, and irradiation. This work identifies molecular chirality as a programmable handle to control spin\u2013orbit interactions and carrier dynamics, providing a general materials\u2010level strategy for high\u2010performance, environmentally benign radiation detectors and spin\u2010enabled optoelectronics.\n                  <\/jats:p>","DOI":"10.1002\/anie.4040066","type":"journal-article","created":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T11:40:14Z","timestamp":1777894814000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Chirality\u2010Induced Spin Optimization in Lead\u2010Free Metal\u2010Halide Hybrids for High\u2010Performance Flexible X\u2010Ray Detectors"],"prefix":"10.1002","volume":"65","author":[{"given":"Xinmei","family":"Liu","sequence":"first","affiliation":[{"name":"Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory For Advanced Energy Devices Shaanxi Engineering Lab For Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianshu","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Integrated Optoelectronics Key Laboratory of Automobile Materials of MOE Key Laboratory of Material Simulation Methods and Software of MOE School of Materials Science and Engineering Jilin University  Changchun China"},{"name":"Department of Materials Imperial College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cong","family":"Geng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Chemical Power Sources Frontiers Science Center For New Organic Matter Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of Chemistry Nankai University  Tianjin 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Chemistry Ministry of Education Shaanxi Key Laboratory For Advanced Energy Devices Shaanxi Engineering Lab For Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ye","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory For Advanced Energy Devices Shaanxi Engineering Lab For Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongchao","family":"Tu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory For Advanced Energy Devices Shaanxi Engineering Lab For Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal 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