低维卤化物钙钛矿直接型X射线探测器研究进展

Research Progress on Low-dimensional Halide Perovskite Direct X-ray Detectors

X射线探测在医学影像、安检、工业无损探测等领域应用广泛。卤化物钙钛矿X射线探测器因具有灵敏度高、检测下限低等显著优点而引人瞩目,然而三维结构的钙钛矿内部离子迁移显著,导致其稳定性较差。研究表明,低维结构可以有效抑制钙钛矿中的离子迁移,进而提高钙钛矿X射线探测器的稳定性。本文围绕X射线探测器的工作原理、关键性能参数、低维钙钛矿材料及器件等方面,详细介绍了低维钙钛矿X射线探测器近期的研究进展,系统分析了低维钙钛矿材料的结构特性及其对X射线探测性能的影响。低维钙钛矿可实现兼具高灵敏度和高稳定性X射线探测器的制备,是发展潜力巨大的候选材料。进一步优化材料体系,设计器件结构,制备大面积、像素化的成像器件,深入研究探测器的工作机制等是促进低维钙钛矿X射线探测器走向应用的关键。

X-ray detection has been widely used in medical imaging,security inspection,and industrial non-destructive tests.Halide perovskite X-ray detectors have attracted increasing attention due to their high sensitivity and low detection limit,but the notorious ion migration leads to poor operational stability.It is reported that the low dimensional structure can effectively suppress the ion migration of perovskites,thus greatly improving the stability of the detectors.This review introduces the working mechanism,key performance parameters of perovskite X-ray detectors,and summarizes the recent progress of low-dimensional perovskite materials and their application in direct X-ray detectors.The relationship between the structural characteristics of low-dimensional perovskite materials and their X-ray detection performance was systematically analyzed.Low-dimensional perovskite is a promising candidate for the preparation of X-ray detectors with both high sensitivity and stability.Further optimization of detection material and device structure,preparation of large-area pixelated imaging devices,and study of working mechanism in-depth of the detector are expected to promote the practical application of perovskite X-ray detectors.