Fabrication and auto-activation of GaAs photocathode

被引:0
|
作者
Yang, Zhi [1 ]
Niu, Jun [1 ]
Qian, Yunsheng [1 ]
Chang, Benkang [1 ]
Shi, Feng [1 ,2 ]
Zhang, Yijun [1 ]
Qiao, Jianliang [1 ]
Xiong, Yajuan [1 ]
Gao, Pin [1 ]
机构
[1] Institute of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China
[2] National Defense Key Laboratory of Night Vision Technology, Xi'an Institute of Applied Optics, Xi'an 710065, China
来源
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | 2009年 / 29卷 / 06期
关键词
Photocathodes - Photocurrents - Automation - Gallium arsenide - III-V semiconductors - Semiconducting gallium;
D O I
10.3969/j.issn.1672-7126.2009.06.15
中图分类号
学科分类号
摘要
The computer-automated system has been successfully developed to intelligently activate the GaAs photocathode by the standardized activation technique and to evaluate in-situ the spectral response. The time evolutions of the photocurrent during both the manual activation and auto-activation with the system were compared. The comparisons show that the auto-activation outperforms the manual activation. In the manual-activation, the photocurrent increases more slowly, the peak photocurrent decreases faster, and the (Cs, O) alternation number is fewer as compared with the auto-activation, possibly because of some mis-operation. For instance, in manual activation of the GaAs photocathode, we observed the (Cs, O) alternation number of 6, a peak photocurrent of 43 μA and an integrated sensitivity of 796 μA/lm; whereas in auto-activation, the (Cs, O) alternation number of 9, a peak photocurrent of 65 μA and an integrated sensitivity of 1100 μA/lm.
引用
收藏
页码:669 / 672
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