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Proceedings Paper

The influences of vacuum pressure and gas components on the stability of GaAs photocathode
Author(s): Long Wang; Feng Shi; Hongchang Cheng; Sen Niu; Hongli Shi; Lei Yan; Xing Cheng; Yuan Yuan
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Paper Abstract

The photocurrent attenuation of GaAs photocathode within one hour after activation under three different vacuum pressure (5×10-9Pa, 5×10-8Pa, 5×10-7Pa) were recorded by automatically activated monitor. The results show that: the photocurrent quickly descend in the beginning and then descend linearly at a low slope; the amplitude of the quickly descending area were 10%, 14.74% and 36%separately, with the respective slope of the linear descending area were -0.00653, -0.01132and -0.02. Three samples’ gas components of H2, CH4, CO, H2O, O2, CO2 etc under the same vacuum pressure (5×10-8Pa)during photocurrent attenuation were collected by quadrupole mass spectrometer. By comparing the gas components content and the attenuation law of the photocurrent, it has been found that H2O and H2 had a greater impact on the stability of GaAs photocathode in the ultra-high vacuum environment and H2O was the predominant effect. This paper has important guiding significance and reference value in studying the stability of GaAs photocathode and the improvement of semiconductor photocathode process.

Paper Details

Date Published: 13 April 2015
PDF: 7 pages
Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 95220I (13 April 2015); doi: 10.1117/12.2178709
Show Author Affiliations
Long Wang, Science and Technology on Low-Light-Level Night Vision Lab. (China)
North Night Vision Science & Technology Group Co. Ltd. (China)
Feng Shi, Science and Technology on Low-Light-Level Night Vision Lab. (China)
North Night Vision Science & Technology Group Co. Ltd. (China)
Hongchang Cheng, Science and Technology on Low-Light-Level Night Vision Lab. (China)
North Night Vision Science & Technology Group Co. Ltd. (China)
Sen Niu, Science and Technology on Low-Light-Level Night Vision Lab. (China)
North Night Vision Science & Technology Group Co. Ltd. (China)
Hongli Shi, Science and Technology on Low-Light-Level Night Vision Lab. (China)
North Night Vision Science & Technology Group Co. Ltd. (China)
Lei Yan, Science and Technology on Low-Light-Level Night Vision Lab. (China)
North Night Vision Science & Technology Group Co. Ltd. (China)
Xing Cheng, Science and Technology on Low-Light-Level Night Vision Lab. (China)
North Night Vision Science & Technology Group Co. Ltd. (China)
Yuan Yuan, Science and Technology on Low-Light-Level Night Vision Lab. (China)
North Night Vision Science & Technology Group Co. Ltd. (China)


Published in SPIE Proceedings Vol. 9522:
Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II
Xiangwan Du; Jennifer Liu; Dianyuan Fan; Jialing Le; Yueguang Lv; Jianquan Yao; Weimin Bao; Lijun Wang, Editor(s)

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