The Surface Activation Layer of GaAs Negative Electron Affinity Photocathode Activated by Cs, Li and NF3 [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 2009.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 14 pages : digital, PDF file
Additional Creators:: Stanford Linear Accelerator Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

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.

Report Numbers:

E 1.99:slac-pub-13810
slac-pub-13810

Subject(s):

Particle Accelerators

Other Subject(s):

Note:

Published through SciTech Connect.
12/11/2009.
"slac-pub-13810"
Submitted to Applied Physics Letters FT
Kirby, R.E.; Maruyama, T.; Sun, Yun; Pianetta, P.; Mulhollan, G.A.; Bierman, J.C.

Funding Information:

AC02-76SF00515

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