Peng Zhang*, Lin Huang, Lili Li, Zhaolai Chen, Guodong Zhang and Xutang Tao*,
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引用次数: 0
摘要
全无机包晶 CsPbBr3 单晶因其出色的光电特性而被视为下一代 X 射线探测器。然而，强烈的离子迁移阻碍了 CsPbBr3 探测器的应用，尤其是在高通量硬 X 射线照射下的应用。在此，我们制备了 Cs1-mRbmPbBr3 单晶，用 Rb 原子取代部分 Cs 原子，以加强 CsPbBr3 的晶格畸变并抑制离子迁移。生产出的 Cs0.7Rb0.3PbBr3 单晶探测器可在 120 kVp X 射线下工作，光通量高达 106 光子 s-1 mm-2。这种 Cs0.7Rb0.3PbBr3 探测器的暗电流密度低至 1.01 μA cm-2，灵敏度高达 33631 μC Gy1- cm-2，在 120 kVp X 射线下的探测限低至 148 nGy s-1。此外，Cs0.7Rb0.3PbBr3 探测器在环境条件下具有超过 30 天的稳定 X 射线探测能力，这表明它具有在高通量硬 X 射线探测中广泛应用的潜力。
High-Flux Hard X-ray Cs1–mRbmPbBr3 Single-Crystal Detector with Suppressed Ion Migration
All-inorganic perovskite CsPbBr3 single crystals are considered a next-generation X-ray detector owing to their excellent photoelectric properties. However, strong ion migration hinders the application of CsPbBr3 detectors, especially those irradiated under high-flux hard X-rays. Herein, we prepared Cs1–mRbmPbBr3 single crystals by partially replacing Cs atoms with Rb atoms to intensify the lattice distortion and suppress ion migration in CsPbBr3. A Cs0.7Rb0.3PbBr3 single-crystal detector operating at 120 kVp X-rays with a flux of up to 106 photons s–1 mm–2 was produced. This Cs0.7Rb0.3PbBr3 detector shows a dark current density as low as 1.01 μA cm–2, a high sensitivity of 33631 μC Gy1– cm–2, and a low detection limit of 148 nGy s–1 under 120 kVp X-rays. Furthermore, the Cs0.7Rb0.3PbBr3 detector exhibits a stable X-ray detection capability for over 30 days under ambient conditions, indicating its potential for wide-scale application in high-flux hard X-ray detection.
期刊介绍：
ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.
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