Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 2, Pages 2879-2886Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c20574
Keywords
X-ray detector; Mg-doped gallium oxide; sensitivity; dark current; oxygen vacancy
Funding
- National Key Research and Development Program of China [2018YFA0703703, 2018YFE0118300]
- National Natural Science Foundation of China [11975168]
- Scientific and Innovative Action Plan of Shanghai [18511110502]
- Equipment Pre-Research Fund Key Project [6140922010601]
- Fundamental Research Funds for Central Universities [22120180514]
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X-ray detection is crucial in various fields, and the beta-Ga2O3 single-crystal-based detector has gained attention for its excellent properties. However, challenges remain in developing high-performance detectors due to dark current and oxygen vacancy concentration issues. This study presents a promising method using Mg-doped beta-Ga2O3 crystals to achieve high sensitivity and improved response speed in X-ray detection.
X-ray detection plays an important role in medical imaging, scientific research, and security inspection. Recently, the beta-Ga2O3 single-crystal-based X-ray detector has attracted extensive attention due to its excellent intrinsic properties such as good absorption for X-ray photons, a high breakdown electric field, high stability, and low cost. However, developing a high-performance beta-Ga2O3-based X-ray detector remains a challenge because of the large dark current and the high oxygen vacancy concentration in the crystals. In this paper, we report a high-performance Mg-doped beta-Ga2O3 single-crystal-based X-ray detector with a sandwich structure. The reduced dark current enables the detector to have a high sensitivity of 338.9 mu C Gy(-1) cm(-2) under SO keV X-ray irradiation with a dose rate of 69.5 mu Gy/s. The sensitivity is 16-fold higher than that of the commercial amorphous selenium detector. Furthermore, the reduced oxygen vacancy concentration can improve the response speed (<0.2 s) of the detector. The present studies provide a promising method to obtain the high performances for the X-ray detector based on beta-Ga(2)O(3 )single crystals.
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