Researchers at the University of Groningen have developed highly sensitive X-ray detectors using methylammonium lead tribromide (MAPbBr3) perovskite single crystals. These detectors exhibit a record-high mobility-lifetime product of 1.2×10⁻² cm² V⁻¹ and an extremely low surface charge recombination velocity of 64 cm s⁻¹. Single-crystal devices with a thickness of 2–3 mm achieved a detection efficiency of 16.4% under near-zero bias, with a sensitivity of 80 μC Gy⁻¹ cm⁻², four times higher than that of α-Se detectors. This allows for reduced radiation doses in medical and security applications. The high sensitivity of these detectors is attributed to the high atomic numbers of Pb, I, and Br in the perovskite material, which enhance X-ray stopping power and charge collection efficiency. The researchers improved the quality of the single crystals through optimized precursor ratios, surface passivation with UV-O3, and device interface engineering. These techniques reduced surface defects and trap density, leading to enhanced charge transport and lower recombination rates. The detectors demonstrated excellent performance in both photodetection and X-ray detection. Under UV light, the devices showed a high specific detectivity of 6.6×10¹¹ cm Hz¹/² W⁻¹ and a noise-equivalent power (NEP) of ~10 pW cm⁻². For X-ray detection, the devices achieved a sensitivity of 80 μC Gy⁻¹ cm⁻² and a lowest detectable X-ray dose rate of 0.5 μGy_air s⁻¹, which is much lower than typical medical diagnostic requirements. The study highlights the potential of MAPbBr3 single crystals for high-sensitivity X-ray detection due to their high mobility-lifetime product, low trap density, and efficient charge collection. The detectors also showed good stability and a fast response time, with a 3 dB cutoff frequency of 480 Hz for X-ray detection. The findings suggest that these detectors could be used in a wide range of applications, including medical imaging, security, and industrial inspection, due to their high sensitivity and low radiation dose requirements.Researchers at the University of Groningen have developed highly sensitive X-ray detectors using methylammonium lead tribromide (MAPbBr3) perovskite single crystals. These detectors exhibit a record-high mobility-lifetime product of 1.2×10⁻² cm² V⁻¹ and an extremely low surface charge recombination velocity of 64 cm s⁻¹. Single-crystal devices with a thickness of 2–3 mm achieved a detection efficiency of 16.4% under near-zero bias, with a sensitivity of 80 μC Gy⁻¹ cm⁻², four times higher than that of α-Se detectors. This allows for reduced radiation doses in medical and security applications. The high sensitivity of these detectors is attributed to the high atomic numbers of Pb, I, and Br in the perovskite material, which enhance X-ray stopping power and charge collection efficiency. The researchers improved the quality of the single crystals through optimized precursor ratios, surface passivation with UV-O3, and device interface engineering. These techniques reduced surface defects and trap density, leading to enhanced charge transport and lower recombination rates. The detectors demonstrated excellent performance in both photodetection and X-ray detection. Under UV light, the devices showed a high specific detectivity of 6.6×10¹¹ cm Hz¹/² W⁻¹ and a noise-equivalent power (NEP) of ~10 pW cm⁻². For X-ray detection, the devices achieved a sensitivity of 80 μC Gy⁻¹ cm⁻² and a lowest detectable X-ray dose rate of 0.5 μGy_air s⁻¹, which is much lower than typical medical diagnostic requirements. The study highlights the potential of MAPbBr3 single crystals for high-sensitivity X-ray detection due to their high mobility-lifetime product, low trap density, and efficient charge collection. The detectors also showed good stability and a fast response time, with a 3 dB cutoff frequency of 480 Hz for X-ray detection. The findings suggest that these detectors could be used in a wide range of applications, including medical imaging, security, and industrial inspection, due to their high sensitivity and low radiation dose requirements.