High-Flux Hard X-ray Cs1-m Rbm PbBr3 Single-Crystal Detector with Suppressed Ion Migration

All-inorganic perovskite CsPbBr3 single crystals are considered a next-generation X-ray detector owing to their excellent photoelectric properties. However, strong ion migration hinders the application of CsPbBr3 detectors, especially those irradiated under high-flux hard X-rays. Herein, we prepared Cs1-mRbmPbBr3 single crystals by partially replacing Cs atoms with Rb atoms to intensify the lattice distortion and suppress ion migration in CsPbBr3. A Cs0.7Rb0.3PbBr3 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 Cs0.7Rb0.3PbBr3 detector shows a dark current density as low as 1.01 mu A cm(-2), a high sensitivity of 33631 mu C Gy(1-) cm(-2), and a low detection limit of 148 nGy s(-1) under 120 kV(p) X-rays. Furthermore, the Cs0.7Rb0.3PbBr3 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.