Perovskite CsPbBr<sub>3</sub> Single‐Crystal Detector Operating at 10<sup>10</sup> Photons s<sup>−1</sup> mm<sup>−2</sup> for Ultra‐High Flux X‐ray Detection
Lei Pan, Indra Raj Pandey, Antonino Miceli, Vladislav V. Klepov, Duck Young Chung, Mercouri G. Kanatzidis
Abstract
Abstract Semiconductors for detecting hard radiation are confronted with considerable problems when operating at high photon fluxes. A perovskite CsPbBr 3 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 CsPbBr 3 detectors show a gamma‐ray energy resolution of ~7.5% at 122 keV for 57 Co 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 ≈10 10 photons s −1 mm −2 at beam area 0.25 mm 2 with Lower Limit of Detection of ≈10 5 photons s −1 mm −2 and Charge Collection Efficiency of ≈100% for 58.61 keV X‐rays. Accordingly, wide application of CsPbBr 3 detectors in high‐flux X‐ray detection is anticipated.