Solvent Free Laminated Fabrication of Lead Halide Perovskites for Sensitive and Stable X‑ray Detection

• Published in: The journal of physical chemistry letters 2021-07, Vol.12 (29), p.6961-6966
• Main Authors: Zhang, Min, Zhao, Wei, Xin, Deyu, Lei, Lin, Long, Jidong, Zhao, Yiying, Zhu, Jianguo, Zheng, Xiaojia, Chen, Qi, Zhang, Wen-Hua
• Format: Article
• Language: English
• Subjects: Physical Insights into Light Interacting with Matter
• ISSN: 1948-7185; 1948-7185
• DOI: 10.1021/acs.jpclett.1c02171

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 MAPbI3 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 MAPbI3-nylon composite (denoted as MAPbI3-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 MAPbI3-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.