High-density stacking of millimeter-scale perovskite single crystals for X-ray inspection

• Metal halide perovskite single crystals have potential in hard X-ray detection, but preparing large-sized thin film single crystals and suppressing halide ion migration under high bias voltages are challenging issues.

• Zhaoolai Chen and others from Shandong University reported a high-density stacked preparation method for oriented millimeter-scale perovskite single crystals with large-area preparation, controllable thickness, and high ion migration activation energy (Ea) capabilities. Oriented growth makes the grain boundaries parallel to the substrate disappear, resulting in a large carrier migration lifetime product (µτ) reaching 2.7×10−3 cm² V −1 , which is comparable to the value of many perovskite bulk single crystals. At low bias, the hard Single crystal hard X-ray detectors are comparable.

  
  

  In addition, the combination of low bias voltage and high Ea results in weakened halide ion migration and a small dark current drift of 3.2×10−4 nA cm−1 s−1 v−1. Due to the excellent detector performance, high-contrast hard X-ray imaging can be obtained at a low dose rate of 1.26 µGy s−1. This research may promote the application of perovskite hard X-ray detectors in practical imaging fields.

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• T. Sun, S. Xie, N. Li, X. Jiang, X. Cheng, Y. Liu, X. Man, SF Liu, Z. Chen, Dense Stacking of Millimeter-Sized Perovskite Single Crystals for Sensitive and Low-Bias Hard X-Ray Detection. Adv. Funct. Mater. 2024, 2314218.

  https://doi.org/10.1002/adfm.202314218