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<p>Although three-dimensional metal halide perovskites are promising candidates for direct X-ray detection, the ion migration of perovskites seriously affects the detector stability. Herein, face-/edge-shared 3D heterometallic glycinate hybrid perovskitoid Pb<sub>2</sub>CuGly<sub>2</sub>X<sub>4</sub> (Gly = -O<sub>2</sub>C-CH<sub>2</sub>-NH<sub>2</sub>; X = Cl, Br) single crystals (SCs), in which the adjacent lead halide layers are linked by large-sized Cu(Gly)<sub>2</sub> pillars, are synthesized in water. The Cu(Gly)<sub>2</sub> pillars in combination with face-/edge-shared inorganic skeleton are found able to synergistically suppress the ion migration, delivering a high ion migration activation energy (<i>E</i><sub><i>a</i></sub>) of 1.06&#xa0;eV. The Pb<sub>2</sub>CuGly<sub>2</sub>Cl<sub>4</sub> SC X-ray detector displays extremely low dark current drift of 1.20 × 10<sup>–9</sup> nA mm<sup>−1</sup>&#xa0;s<sup>−1</sup>&#xa0;V<sup>−1</sup> under high electric field (120&#xa0;V&#xa0;mm<sup>−1</sup>) and continuous X-ray irradiation (2.86&#xa0;Gy), and a high sensitivity of 9,250 μC Gy<sup>−1</sup>&#xa0;cm<sup>−2</sup> is also achieved. More excitingly, the Pb<sub>2</sub>CuGly<sub>2</sub>Cl<sub>4</sub> nanocrystal can be easily dispersed in water and directly blade-coated on thin-film transistor (TFT) array substrate, and the obtained Pb<sub>2</sub>CuGly<sub>2</sub>Cl<sub>4</sub>-based TFT array detector offers an X-ray imaging capability with spatial resolution of 2.2 lp mm<sup>−1</sup>.</p>

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Face-/Edge-Shared 3D Perovskitoid Single Crystals with Suppressed Ion Migration for Stable X-Ray Detector

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月23日

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  • Zimin Zhang,
  • Xiaoli Wang,
  • Huayang Li,
  • Dong Li,
  • Yang Zhang,
  • Nan Shen,
  • Xue-Feng Yu,
  • Yucheng Liu,
  • Shengzhong Liu,
  • Haomin Song,
  • Yanliang Liu,
  • Xingzhu Wang,
  • Shi Chen

摘要

Although three-dimensional metal halide perovskites are promising candidates for direct X-ray detection, the ion migration of perovskites seriously affects the detector stability. Herein, face-/edge-shared 3D heterometallic glycinate hybrid perovskitoid Pb2CuGly2X4 (Gly = -O2C-CH2-NH2; X = Cl, Br) single crystals (SCs), in which the adjacent lead halide layers are linked by large-sized Cu(Gly)2 pillars, are synthesized in water. The Cu(Gly)2 pillars in combination with face-/edge-shared inorganic skeleton are found able to synergistically suppress the ion migration, delivering a high ion migration activation energy (Ea) of 1.06 eV. The Pb2CuGly2Cl4 SC X-ray detector displays extremely low dark current drift of 1.20 × 10–9 nA mm−1 s−1 V−1 under high electric field (120 V mm−1) and continuous X-ray irradiation (2.86 Gy), and a high sensitivity of 9,250 μC Gy−1 cm−2 is also achieved. More excitingly, the Pb2CuGly2Cl4 nanocrystal can be easily dispersed in water and directly blade-coated on thin-film transistor (TFT) array substrate, and the obtained Pb2CuGly2Cl4-based TFT array detector offers an X-ray imaging capability with spatial resolution of 2.2 lp mm−1.