材料科学
钙钛矿(结构)
半导体
光电子学
分析化学(期刊)
单晶
光电流
肖特基二极管
光学
二极管
核磁共振
结晶学
物理
化学
色谱法
作者
Lei Pan,Zhifu Liu,Claire Welton,Vladislav V. Klepov,John A. Peters,Michael C. De Siena,Alessandro Benadia,Indra Raj Pandey,Antonino Miceli,Duck Young Chung,G. N. Manjunatha Reddy,Bruce W. Wessels,Mercouri G. Kanatzidis
标识
DOI:10.1002/adma.202211840
摘要
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 .
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