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High-Performance X-ray Detector Based on Single-Crystal β-Ga2O3:Mg.
Jiawen Chen1, Huili Tang1, Bo Liu1
1Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, P. R. China.
ACS Applied Materials & Interfaces
|January 11, 2021
Summary
This study introduces a high-performance Mg-doped beta-gallium oxide (β-Ga2O3) single-crystal X-ray detector. The novel detector demonstrates significantly reduced dark current and improved sensitivity for advanced X-ray imaging applications.
Area of Science:
- Materials Science
- Solid-State Physics
- Detector Technology
Background:
- X-ray detection is crucial for medical imaging, research, and security.
- Beta-gallium oxide (β-Ga2O3) offers excellent properties for X-ray detection but faces challenges with dark current and oxygen vacancies.
- High-performance detectors are needed to overcome current limitations.
Purpose of the Study:
- To develop a high-performance X-ray detector using Mg-doped β-Ga2O3 single crystals.
- To address the issues of high dark current and oxygen vacancy concentration in β-Ga2O3 detectors.
- To enhance sensitivity and response speed for practical X-ray detection.
Main Methods:
- Fabrication of a sandwich-structured X-ray detector utilizing Mg-doped β-Ga2O3 single crystals.
- Characterization of detector performance under X-ray irradiation.
- Analysis of dark current and oxygen vacancy concentration effects on detector performance.
Main Results:
- Achieved a high sensitivity of 338.9 μC Gy-1 cm-2 at 50 keV, 16 times higher than commercial amorphous selenium detectors.
- Significantly reduced dark current and oxygen vacancy concentration in the Mg-doped β-Ga2O3 detector.
- Demonstrated a fast response time of less than 0.2 seconds.
Conclusions:
- Mg doping effectively reduces dark current and oxygen vacancies in β-Ga2O3 single-crystal X-ray detectors.
- The developed detector exhibits superior sensitivity and response speed, outperforming existing technologies.
- This work presents a promising pathway for advancing β-Ga2O3-based X-ray detector technology.
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