School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics, Chengdu 610200, China.
J Phys Chem Lett. 2021 Jul 29;12(29):6961-6966. doi: 10.1021/acs.jpclett.1c02171. Epub 2021 Jul 20.
The halide perovskite X-ray detector can meet the urgent needs of low-dose medical imaging by X-rays. However, there is still a pressing challenge in lacking robust methods for large-scale fabrication of high-quality perovskite films with tunable thickness. Here we report a laminated fabrication of polycrystalline MAPbI by using solvent-free liquid perovskite molten-salt (PMS), that offers reduced toxic issue, scalable fabrication, and highly tunability in film thickness. Nylon membrane was chosen as a scaffold for the infiltration of PMS, which simultaneously acts as a physical barrier to suppress the ionic migration in the MAPbI-nylon composite (denoted as MAPbI-LLP). The enhanced material properties result in good stability and high performance of X-ray detectors that show low detection limit and high sensitivity. Additionally, single gamma-ray photon detection was realized by MAPbI-LLP detectors. The promising performance characteristics of such polycrystalline detectors can accelerate the adoption of polycrystalline perovskites in X-ray imaging and gamma-ray detection.
卤化物钙钛矿 X 射线探测器可以满足 X 射线低剂量医学成像的迫切需求。然而，在缺乏用于大规模制备具有可调厚度的高质量钙钛矿薄膜的稳健方法方面，仍然存在紧迫的挑战。在这里，我们报告了一种使用无溶剂液体钙钛矿熔盐（PMS）层压法制备多晶 MAPbI 的方法，该方法降低了毒性问题，具有可扩展性，并且在薄膜厚度方面具有高度可调性。尼龙膜被选为 PMS 渗透的支架，同时作为物理屏障抑制 MAPbI-尼龙复合材料（表示为 MAPbI-LLP）中的离子迁移。增强的材料性能导致 X 射线探测器具有良好的稳定性和高性能，表现出低检测限和高灵敏度。此外，通过 MAPbI-LLP 探测器实现了单个伽马光子的检测。这种多晶探测器的有前景的性能特征可以加速多晶钙钛矿在 X 射线成像和伽马射线检测中的应用。
