Fast X-ray detectors based on bulk β-Ga2O3 (Fe)

被引：36
作者：
Hany, Ibrahim [1 ]
Yang, Ge [1 ]
Chung, Ching-Chang [2 ]
机构：
[1] North Carolina State Univ, Dept Nucl Engn, Raleigh, NC 27607 USA
[2] North Carolina State Univ, Analyt Instrumentat Facil, Raleigh, NC 27695 USA
来源：
JOURNAL OF MATERIALS SCIENCE | 2020年 / 55卷 / 22期
基金：
美国国家科学基金会;
关键词：
SCINTILLATION PROPERTIES;
D O I：
10.1007/s10853-020-04665-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
(010) EFG-grown Fe-doped beta-Ga2O3 was tested as a low-noise X-ray detector with Ti/Au electrodes vertical structure. Its performance at low, high and no applied voltages was examined. The fabricated detector showed high X-ray detection performance manifested in its signal's short fall and rise time (< 0.3 s) in all operation modes, showing two orders of magnitude decrease in response time of beta-Ga2O3 X-ray detectors. The same temporal response was exhibited by a tested Au/Ni/beta-Ga2O3/Ti/Au device. The detector's signal is also characterized by excellent linear relation with X-ray tube current and high signal-to-noise ratio (SNR) optimized at - 5 V (> 10(3)). Moreover, the X-ray-induced current signal exhibits high stability. Sub-band UV photocurrent signal showed a significantly slower response compared to X-ray-induced conductivity signal. Possible charge transport mechanisms involving ion migration are suggested and discussed. In this study, Fe doping is shown to significantly improve X-ray detection performance of Ga2O3, consolidating the applicability of Ga2O3 as a next-generation X-ray detector functioning with low power, high SNR and linearity, and significantly improved transient characteristics.
引用
收藏
页码：9461 / 9469
页数：9
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