Perovskite CsPbBr3 Single-Crystal Detector Operating at 10(10) Photons s(-1) mm(-2) for Ultra-High Flux X-ray Detection

Semiconductors for detecting hard radiation are confronted with considerable problems when operating at high photon fluxes. A perovskite CsPbBr3 single-crystal detector capable of operating at X-ray fluxes of up to 10(10) photons s(-1) mm(-2) with beam area <= 0.25 mm(2) at 58.61 keV for current-mode X-ray detection is reported. The spectrometer-grade melt-grown CsPbBr3 detectors show a gamma-ray energy resolution of similar to 7.5% at 122 keV for Co-57 and dark current as low as 4.3 nA (0.5 nA mm(-2)) at a reverse bias voltage of 200 V (118 V mm(-1)). The detector is tested at X-ray energies of 8.2, 10, and 58.61 keV at a synchrotron light source under a reverse bias voltage of up to 1000 V (588 V mm(-1)). Under a sufficiently high bias voltage and within several hundreds of seconds X-ray exposure, good photocurrent linearity (goodness of fit R-2 > 0.99) and reproducibility are obtained up to a flux of approximate to 10(10) photons s(-1) mm(-2) at beam area 0.25 mm(2) with Lower Limit of Detection of approximate to 10(5) photons s(-1) mm(-2) and Charge Collection Efficiency of approximate to 100% for 58.61 keV X-rays. Accordingly, wide application of CsPbBr3 detectors in high-flux X-ray detection is anticipated.