The surface activation layer of GaAs negative electron affinity photocathode activated by Cs, Li, and NF3

被引：36

作者：

Sun, Y. ^{[1
]}

Kirby, R. E. ^{[2
]}

Maruyama, T. ^{[3
]}

Mulhollan, G. A. ^{[2
]}

Bierman, J. C. ^{[2
]}

Pianetta, P. ^{[1
]}

机构：

[1] Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA

[2] Saxet Surface Sci, Austin, TX 78744 USA

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 95025 USA

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 17期

关键词：

NITROGEN TRIFLUORIDE; PHOTOEMISSION; STABILITY; COMPLEXES;

D O I：

10.1063/1.3257730

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The lifetime of GaAs photocathodes can be greatly improved by introducing Li in the Cs+NF3 activation process. The surface activation layer of such photocathodes is studied by synchrotron radiation photoemission and is compared with GaAs photocathodes activated without Li. The charge distributions of N, F, and Cs experience significant changes when Li is added in the activation. In addition, the presence of Li causes NFx molecules to take an orientation with F atoms on top. All these changes induced by Li hold the key for the lifetime improvement of GaAs photocathodes. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3257730]

引用

页数：3

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