Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China.
Department of Materials Science, Sichuan University, Chengdu 610064, China.
Chem Commun (Camb). 2023 Apr 25;59(34):5016-5029. doi: 10.1039/d3cc00969f.
Halide perovskites have attracted significant research interests in the X-ray detection and imaging field. Their strong X-ray attenuating ability and good carrier transportation endow them with high sensitivity, which is better than those of commercialized amorphous selenium (a-Se) and CdZnTe (CZT). However, ion migration has been identified as a critical factor that deteriorates the performance of three-dimensional (3D) lead-based halide perovskite detectors. Moreover, large dark current has hindered their application in low-dose X-ray detection. Another major challenge is to fabricate large area, high-quality thick perovskites that can be integrated with commercial electronic readout backplanes, such as thin-film transistors (TFTs) and complementary metal-oxide-semiconductor (CMOS) transistors, to produce multipixel flat-panel detectors for X-ray imaging. Bismuth-based halide perovskites have been demonstrated to be competitive candidates due to their low ionic migration and small dark current. Fabrication methods, including pressing, membrane filling, blade coating, spray coating , will be summarized and discussed in detail. This feature article discusses the potential and challenges in perovskite X-ray detection and imaging, providing new research directions for future development.
卤化物钙钛矿在 X 射线检测和成像领域引起了广泛的研究兴趣。它们具有很强的 X 射线衰减能力和良好的载流子输运能力，因此具有很高的灵敏度，优于商业化的非晶硒（a-Se）和碲锌镉（CZT）。然而，离子迁移已被确定为恶化三维（3D）基于铅的卤化物钙钛矿探测器性能的关键因素。此外，大的暗电流阻碍了它们在低剂量 X 射线检测中的应用。另一个主要挑战是制造大面积、高质量的厚钙钛矿，以便与商业电子读出背板集成，如薄膜晶体管（TFT）和互补金属氧化物半导体（CMOS）晶体管，以生产用于 X 射线成像的多像素平板探测器。基于铋的卤化物钙钛矿由于其低离子迁移率和小暗电流而被证明是有竞争力的候选材料。本文将详细总结和讨论各种制备方法，包括压制、膜填充、刮刀涂布、喷涂等。本文讨论了钙钛矿 X 射线检测和成像的潜力和挑战，为未来的发展提供了新的研究方向。
