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Stereochemically Active Lone-Pair Electrons Driven High-Performance and Self-Powered X-Ray Detection in Cs2TeMo3O12
Feifei Guo1, Jianhui Liu1, Fuai Hu1
1State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan, 250100, China.
Small Methods
|November 20, 2025
Summary
A new inorganic crystal, Cs2TeMo3O12, offers high-performance X-ray detection. This material enables self-powered X-ray detectors with excellent sensitivity and stability, overcoming limitations of conventional detectors.
Area of Science:
- Materials Science
- Solid-State Physics
- Crystallography
Background:
- X-ray detection is vital for medical imaging and industrial applications.
- Conventional X-ray detectors suffer from low efficiency, high dark current, and require external power.
- There is a need for advanced materials for efficient, self-powered X-ray detection.
Purpose of the Study:
- To introduce Cs2TeMo3O12 as a novel inorganic polar oxide crystal for direct-conversion X-ray detection.
- To investigate its potential for self-powered X-ray detector applications.
- To explore the role of lone-pair electrons in designing advanced photoelectric materials.
Main Methods:
- Synthesis and characterization of Cs2TeMo3O12 single crystals.
- Measurement of electrical properties, including resistivity and mobility-lifetime product.
- Performance evaluation of X-ray detector devices under various conditions, including self-powered mode.
Main Results:
- Cs2TeMo3O12 exhibits a non-centrosymmetric polar structure due to Te4+ lone-pair electrons, creating a built-in electric field.
- The material shows high resistivity (5.08 × 10^14 Ω cm) and a high mobility-lifetime product (1.08 × 10^-3 cm^2 V^-1).
- Exceptional X-ray detection sensitivity (436 µC Gy_air^-1 cm^-2) and self-powered operation (178 µC Gy_air^-1 cm^-2) with an ultralow detection limit (10.5 nGy_air s^-1) were achieved.
Conclusions:
- Cs2TeMo3O12 is a promising material for high-performance, low-dose, and self-powered X-ray detection.
- The built-in electric field from lone-pair electrons facilitates efficient charge separation without external bias.
- This study offers a new design strategy for advanced photoelectric materials using lone-pair electron effects.
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