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Proceedings Paper

Activation processes on GaAs photocathode by different currents of oxygen source
Author(s): Zhuang Miao; Feng Shi; Hongchang Cheng; Shufei Wang; Xiaohui Zhang; Yuan Yuan; Chang Chen
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Paper Abstract

In order to know the influence of activation processes on GaAs photocathodes, three GaAs samples were activated by a fixed current of cesium source and different currents of oxygen source. The current of caesium source is same during activation to ensure initial adsorption of caesium quantum is similar, which is the base to show the difference during alternation activation of caesium and oxygen. Analysed with the activation data, it is indicated that Cs-to-O current ratio of 1.07 is the optimum ratio to obtain higher sensitivity and better stability. According to double dipole model, stable and uniform double dipole layers of GaAs-O-Cs:Cs-O-Cs are formed and negative electron affinity is achieved on GaAs surface by activation with cesium and oxygen. The analytical result is just coincident with the model. Thus there is an efficient technological method to improve sensitivity and stability of GaAs photocathode.

Paper Details

Date Published: 13 April 2015
PDF: 5 pages
Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 95220H (13 April 2015); doi: 10.1117/12.2178708
Show Author Affiliations
Zhuang Miao, 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)
Shufei Wang, Science and Technology on Low-Light-Level Night Vision Lab. (China)
North Night Vision Science & Technology Group Co. Ltd. (China)
Xiaohui Zhang, 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)
Chang Chen, 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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