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BiO(IO3) with Ultrahigh Effective Atomic Number and Density for Sensitive and Stable Hard X-Ray Detection
Haiyu Ren1, Youkui Xu1, Feifei Chai2
1School of Physical Science and Technology, Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Key Laboratory of Quantum Theory and Applications of MoE, and Gansu Provincial Research Center for Basic Disciplines of Quantum Physics, Lanzhou University, Lanzhou, Gansu, China.
Advanced Materials (Deerfield Beach, Fla.)
|January 27, 2026
Summary
Researchers developed a new 2D bismuth oxyiodide material for hard X-ray detection. This material offers enhanced X-ray absorption and stability, improving detector performance.
Area of Science:
- Materials Science
- Solid-State Physics
- Detector Technology
Background:
- Bismuth halide perovskites show promise for hard X-ray detection due to high effective atomic number (Zeff) and optoelectronic properties.
- Existing materials face challenges with reduced Zeff/density and electron localization when addressing stability, hindering performance.
Purpose of the Study:
- To design a novel material for hard X-ray detection with enhanced absorption, charge transport, and stability.
- To overcome the limitations of traditional bismuth halide perovskites in X-ray detector applications.
Main Methods:
- Designed a 2D bismuth oxyiodide (BiO(IO3)) by substituting oxidized iodine (I5+) for iodide (I-).
- Fabricated polycrystalline wafers (1 mm thickness) for device testing.
- Conducted aging tests under continuous X-ray exposure, high voltage, and elevated temperatures.
Main Results:
- Achieved ultrahigh Zeff (72.29) and density (7.399 g/cm3) for superior hard X-ray absorption.
- Demonstrated high device sensitivity (4563 µC Gyair-1 cm-2) for ~25 keV X-ray photons.
- Exhibited excellent material stability with a high ion migration activation energy (0.73 eV) and no performance degradation after aging tests.
Conclusions:
- The novel 2D BiO(IO3) material offers a promising solution for high-performance hard X-ray detection.
- The material's design overcomes previous limitations, enhancing X-ray absorption, carrier transport, and long-term stability.
- This work paves the way for advanced X-ray detector development.
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