Ultra-High Flux X-Ray Detection by Solution-Grown Perovskite CsPbBr3 Single Crystal Semiconductor Detector.

Abstract

Solution-processed perovskites are promising for hard X-ray and gamma ray detection, but there has been limited reports on their performance under extremely intense X-rays. Here, we report a solution-grown all-inorganic perovskite CsPbBr3 single crystal semiconductor detector capable of operating at ultra-high X-ray flux of 1010 photons s-1 mm-2 . High-quality solution-grown CsPbBr3 single crystals were fabricated into detectors with a Schottky diode structure of eutectic gallium indium/CsPbBr3 /Au. A high reverse bias voltage of 1000V (435V mm-1 ) can be applied with a small and stable dark current of ∼ 60 - 70 nA (∼ 9 - 10 nA mm-2 ), which enabled a high sensitivity larger than 10000 μC Gyair -1 cm-2 and a simultaneous low detection limit of 22 nGyair s-1 . The CsPbBr3 semiconductor detector showed an excellent photocurrent linearity and reproducibility under 58.61keV synchrotron X-ray with flux from 106 to 1010 photons s-1 mm-2 . Defect characterization by thermally stimulated current spectroscopy showed a similar low defect density of a synchrotron X-ray and a lab X-ray irradiated device. 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 . This article is protected by copyright. All rights reserved.