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

Yun Sun | Zendy; R. E. Kirby | Zendy; Takashi Maruyama | Zendy; G. A. Mulhollan | Zendy; J. C. Bierman | Zendy; P. Pianetta | Zendy

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

Author(s) -

Yun Sun,

R. E. Kirby,

Takashi Maruyama,

G. A. Mulhollan,

J. C. Bierman,

P. Pianetta

Publication year - 2009

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.3257730

Subject(s) - photocathode , chemistry , layer (electronics) , electron , electron affinity (data page) , synchrotron radiation , gallium arsenide , optoelectronics , atomic physics , analytical chemistry (journal) , molecule , materials science , optics , physics , organic chemistry , chromatography , quantum mechanics

The lifetime of GaAs photocathodes can be greatly improved by introducing Li in the Cs+NF{sub 3} 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 NF{sub x} 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.

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