Influence of cesium on the stability of a GaAs photocathode

doi:10.1088/1674-1056/20/8/087902

中国物理B ›› 2011, Vol. 20 ›› Issue (8): 87902-087902.doi: 10.1088/1674-1056/20/8/087902

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Influence of cesium on the stability of a GaAs photocathode

张俊举, 常本康, 付小倩, 杜玉杰, 李飙, 邹继军

School of Electronic Engineering & Optoelectronic Techniques, Nanjing University of Science and Technology, Nanjing 210094, China

收稿日期:2011-01-12 修回日期:2011-03-15 出版日期:2011-08-15 发布日期:2011-08-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60678043, 60871012, and 60801036) and the Research Funding of Nanjing University of Science and Technology (Grant No. 2010ZYTS032).

Influence of cesium on the stability of a GaAs photocathode

Zhang Jun-Ju (张俊举), Chang Ben-Kang (常本康), Fu Xiao-Qian (付小倩), Du Yu-Jie (杜玉杰), Li Biao (李飙), Zou Ji-Jun (邹继军)

School of Electronic Engineering & Optoelectronic Techniques, Nanjing University of Science and Technology, Nanjing 210094, China

Received:2011-01-12 Revised:2011-03-15 Online:2011-08-15 Published:2011-08-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60678043, 60871012, and 60801036) and the Research Funding of Nanjing University of Science and Technology (Grant No. 2010ZYTS032).

摘要/Abstract

摘要： The stability of a reflection-mode GaAs photocathode has been investigated by monitoring the photocurrent and the spectral response at room temperature. We observe the photocurrent of the cathode decaying with time in the vacuum system under the action of Cs current, and find that the Cs atoms residing in the vacuum system are helpful in prolonging the life of the cathode. We examine the evolution and analyse the influence of the barrier on the spectral response of the cathode. Our results support the double dipolar model for the explanation of the negative electron affinity effect.

Abstract: The stability of a reflection-mode GaAs photocathode has been investigated by monitoring the photocurrent and the spectral response at room temperature. We observe the photocurrent of the cathode decaying with time in the vacuum system under the action of Cs current, and find that the Cs atoms residing in the vacuum system are helpful in prolonging the life of the cathode. We examine the evolution and analyse the influence of the barrier on the spectral response of the cathode. Our results support the double dipolar model for the explanation of the negative electron affinity effect.

Key words: GaAs photocathode, negative electron affinity, activation, photocathode stability

中图分类号: (Interfaces; heterostructures; nanostructures)

79.60.Jv

72.80.Ey (III-V and II-VI semiconductors) 73.20.At (Surface states, band structure, electron density of states)

张俊举, 常本康, 付小倩, 杜玉杰, 李飙, 邹继军. Influence of cesium on the stability of a GaAs photocathode[J]. 中国物理B, 2011, 20(8): 87902-087902.

Zhang Jun-Ju (张俊举), Chang Ben-Kang (常本康), Fu Xiao-Qian (付小倩), Du Yu-Jie (杜玉杰), Li Biao (李飙), Zou Ji-Jun (邹继军). Influence of cesium on the stability of a GaAs photocathode[J]. Chin. Phys. B, 2011, 20(8): 87902-087902.

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Influence of cesium on the stability of a GaAs photocathode

Influence of cesium on the stability of a GaAs photocathode

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