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Two-Dimensional Copper(II)-Based Perovskite Single Crystals for Sensitive X-ray Detection.

Qingyun Han1, Ning Ding2, Haoyu Chen1

  • 1State Key Laboratory of Bioinspired Interfacial Materials Science, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123, P. R. China.

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|September 25, 2025
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A new lead-free copper perovskite, (t-ACH)2CuBr4, shows excellent performance for X-ray detection. This environmentally friendly material offers high sensitivity and stability, paving the way for sustainable X-ray imaging technologies.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Lead halide perovskites are excellent for X-ray detection but pose environmental risks.
  • Lead-free alternatives are crucial for sustainable X-ray detector development.

Purpose of the Study:

  • To synthesize and characterize a novel 2D copper(II)-based perovskite for X-ray detection.
  • To evaluate the X-ray detection performance and stability of the new material.

Main Methods:

  • Synthesis of high-quality single crystals of (t-ACH)2CuBr4.
  • Fabrication of a vertical Au/(t-ACH)2CuBr4/Au X-ray detector.
  • Performance testing including sensitivity, dark current, and operational stability.

Main Results:

  • High-quality single crystals up to 14 × 8 × 1 mm³ were obtained.
  • The detector demonstrated high sensitivity (65.9 μC Gyair⁻¹ cm⁻²) and low dark current drift (2.367 × 10⁻⁶ nA cm⁻¹ s⁻¹ V⁻¹).
  • Excellent operational stability was observed, highlighting the material's robustness.

Conclusions:

  • Hydrogen-bond-stabilized, ecofriendly copper halide perovskites are promising for next-generation X-ray detectors.
  • The developed (t-ACH)2CuBr4 perovskite offers a sustainable alternative to lead-based materials.
  • This research advances the field of sustainable X-ray detection technologies.