Ultrahigh‐Flux X‐ray Detection by a Solution‐Grown Perovskite CsPbBr3 Single‐Crystal Semiconductor Detector

Solution‐processed perovskites are promising for hard X‐ray and gamma‐ray detection, but there are limited reports on their performance under extremely intense X‐rays. Here, a solution‐grown all‐inorganic perovskite CsPbBr3 single‐crystal semiconductor detector capable of operating at ultrahigh X‐ray flux of 1010 photons s−1 mm−2 is reported. High‐quality solution‐grown CsPbBr3 single crystals are fabricated into detectors with a Schottky diode structure of eutectic gallium indium/CsPbBr3/Au. A high reverse‐bias voltage of 1000 V (435 V mm−1) can be applied with a small and stable dark current of ≈60–70 nA (≈9–10 nA mm−2), which enables a high sensitivity larger than 10 000 µC Gyair−1 cm−2 and a simultaneous low detection limit of 22 nGyair s−1. The CsPbBr3 semiconductor detector shows an excellent photocurrent linearity and reproducibility under 58.61 keV synchrotron X‐rays with flux from 106 to 1010 photons s−1 mm−2. Defect characterization by thermally stimulated current spectroscopy shows a similar low defect density of a synchrotron X‐ray and a lab X‐ray irradiated device. Solid‐state nuclear magnetic resonance spectroscopy suggests that the excellent performance of the solution‐grown CsPbBr3 single crystal may be associated with its good short‐range order, comparable to the spectrometer‐grade melt‐grown CsPbBr3. The low‐cost solution‐grown CsPbBr3 with low defect density and good short‐range order shows a record‐high X‐ray sensitivity of >10 000 µC Gyair−1 cm−2 and a low detection limit of 22 nGyair s−1. Under ultrahigh flux of synchrotron X‐rays (106 to 1010 photons s−1 mm−2 at 58.61 keV), a good photocurrent linearity and reproducibility are achieved.