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Conventional high\u2010performance detectors use thick single\u2010crystal active layers to boost sensitivity, but this increases device volume, raises dark current, and complicates integration with flexible and portable electronics. Here, we break from this paradigm with an ultrathin, high\u2010mobility 2D molecular crystal (2DMC) integrated into a lateral field\u2010effect transistor. This design employs a highly confined in\u2010plane carrier transport path coupled with strong gate\u2010electrostatic control to achieve complete carrier depletion and sub\u2010pA dark currents. Thanks to high\u2010mobility and efficient charge collection in the ultrathin channel, the detector achieves a record volumetric sensitivity of 5.91\u00a0\u00d7\u00a010\n                    <jats:sup>10<\/jats:sup>\n                    \u00b5C Gy\n                    <jats:sup>\u22121<\/jats:sup>\n                    cm\n                    <jats:sup>\u22123<\/jats:sup>\n                    and a detection limit of 1.43 nGy s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , surpassing all reported organic detectors and competing with state\u2010of\u2010the\u2010art inorganic ones. Importantly, we show that in the ultrathin regime, high\u2010mobility outweighs atomic number in governing sensitivity, overturning conventional design logic. We further fabricate large\u2010area, uniform 2DMC arrays with excellent operational stability, enabling high\u2010contrast imaging at doses as low as 10.17 nGy s\n                    <jats:sup>\u22121<\/jats:sup>\n                    . This work establishes a new paradigm for lightweight, low\u2010dose organic X\u2010ray imaging and introduces mobility\u2010centric design rules for next\u2010generation detectors.\n                  <\/jats:p>","DOI":"10.1002\/adma.202522929","type":"journal-article","created":{"date-parts":[[2026,2,22]],"date-time":"2026-02-22T14:04:01Z","timestamp":1771769041000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["High\u2010Mobility 2D Molecular Crystals Enable Field\u2010Effect X\u2010Ray Detectors with Record Volumetric Sensitivity"],"prefix":"10.1002","volume":"38","author":[{"given":"Yiwen","family":"Ren","sequence":"first","affiliation":[{"name":"State Key Laboratory of Advanced Materials for Intelligent Sensing Key Laboratory of Organic Integrated Circuit Ministry of Education &amp; Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science &amp; Institute of Molecular Aggregation Science Tianjin University  Tianjin P. 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