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graded composition and doping p-i-n Al_(x)Ga_(1−x)As/GaAs detector for unbiased voltage operation

Nuclear Science and Techniques 2022年第7期33卷 73-82页

作者： Zhi-Fu Zhu Ji-Jun Zou Zhi-Jia Sun He Huang Qing-Lei Xiu Zhong-Ming Zhang Yong Gan Chen-Xian Guo Shao-Tang Wang Xiu-Ping Yue Guo-Li Kong School of Information Engineering Zhengzhou University of TechnologyZhengzhou450044China Engineering Research Center of Nuclear Technology Application(East China University of Technology) Ministry of EducationNanchang330013China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China Engineering Department LA14YWLancaster UniversityLancasterUK

p-i-n Al_(x)Ga_(1−x)As/GaAs detectors with graded compositions and graded doping were grown and prepared.From the current-voltage and capacitance-voltage measurement results,the devices had good p-n junction diode characteristics,and the electric field strength under an unbiased voltage was 1.7×10^(5) Vcm^(-1).The full width at half maximum and charge collection efficiency of the detectors obtained from energy spectrum measurements of 5.48-MeV alpha particles were 3.04 and approximately 93%,respectively.In this study,we created the most advanced and promising state-of-the-art unbiased detector reported to date.

关键词： graded composition graded doping Detector p-i-n Al_(x)Ga_(1−x)As/GaAs

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Resolution characteristics of graded doping and graded composition reflection-mode AlGaAs/GaAs photocathodes

Resolution characteristics of graded doping and graded compo...

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国防光电子论坛第二届新型探测技术及其应用研讨会

作者：邓文娟张道礼邹继军彭新村王炜路张益军常本康 State Key Laboratory Breeding Base of Nuclear Resources and Environment East China Institute of Technology School of Optical and Electronic Information Huazhong University of Science and Technology School of Electronic and Optical Engineering Nanjing University of Science and Technology

The resolution model of graded doping and graded composition reflection-mode AlGaAs/GaAs photocathode is solved numerically from the two-dimensional continuity equations. According to the model, the theoretical modulation transfer functions(MTFs) of different structure reflection-mode photocathodes were calculated, and the effects of doping concentration, Al composition, AlGaAs and Ga As layer thickness on the resolution of cathodes were analyzed. The simulation results show that both graded composition and graded doping structures can increase the resolution of photocathode, and the effect of graded composition structure is more pronounced. The resolution improvement is attributed to the built-in electric field induced by a graded composition or doping structure. The simulation results also show that the MTFs of cathodes are affected by the AlGaAs and GaAs layer thickness.

关键词： graded doping built-in electric field graded composition modulation transfer function resolution

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