High-Flux Hard X-ray Cs_1–mRb_mPbBr₃ Single-Crystal Detector with Suppressed Ion Migration

All-inorganic perovskite CsPbBr 3 single crystals are considered a next-generation X-ray detector owing to their excellent photoelectric properties. However, strong ion migration hinders the application of CsPbBr 3 detectors, especially those irradiated under high-flux hard X-rays. Herein, we prepared Cs 1– m Rb m PbBr 3 single crystals by partially replacing Cs atoms with Rb atoms to intensify the lattice distortion and suppress ion migration in CsPbBr 3 . A Cs 0.7 Rb 0.3 PbBr 3 single-crystal detector operating at 120 kV p X-rays with a flux of up to 10 6 photons s –1 mm –2 was produced. This Cs 0.7 Rb 0.3 PbBr 3 detector shows a dark current density as low as 1.01 μA cm –2, a high sensitivity of 33631 μC Gy 1– cm –2, and a low detection limit of 148 nGy s –1 under 120 kV p X-rays. Furthermore, the Cs 0.7 Rb 0.3 PbBr 3 detector exhibits a stable X-ray detection capability for over 30 days under ambient conditions, indicating its potential for wide-scale application in high-flux hard X-ray detection.