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

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(3) 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(3)-nylon composite (denoted as MAPbI(3)-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 gammaray photon detection was realized by MAPbI(3)-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.

Automated summary

The study presented a method for fabricating polycrystalline MAPbI(3) films using solvent-free liquid perovskite molten-salt (PMS), offering reduced toxicity, scalable fabrication, and tunability in film thickness. The use of nylon membrane as a scaffold for the infiltration of PMS resulted in MAPbI(3)-LLP detectors with enhanced material properties, showing good stability and high performance in X-ray and single gammaray photon detection, which could accelerate the adoption of polycrystalline perovskites in X-ray imaging and gamma-ray detection.