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X-ray photon detection is important for a wide range of applications. Thehighest demand, however, comes from medical imaging, which requirescost-effective, high-resolution detectors operating at low photon flux,therefore stimulating the search for novel materials and new approaches.Recently, hybrid halide perovskite CH3NH3PbI3 (MAPbI3) has attractedconsiderable attention due to its advantageous optoelectronic properties andlow fabrication costs. The presence of heavy atoms, providing a high scatteringcross-section for photons, makes this material a perfect candidate for X-raydetection. Despite the already-successful demonstrations of efficiency indetection, its integration into standard microelectronics fabrication processesis still pending. Here, we demonstrate a promising method for building X-raydetector units by 3D aerosol jet printing with a record sensitivity of 2.2 x108 {\mu}C Gyair-1cm-2 when detecting 8 keV photons at dose-rates below 1 Gy/s(detection limit 0.12 Gy/s), a four-fold improvement on the best-in-classdevices. An introduction of MAPbI3-based detection into medical imaging wouldsignificantly reduce health hazards related to the strongly ionizing X-raysphotons.

Ultrasensitive 3D Aerosol-Jet-Printed Perovskite X-Ray Photodetector