Correlation of CsK{sub 2}Sb photocathode lifetime with antimony thickness

Journal Article · Mon Jun 01 00:00:00 EDT 2015 · APL materials

DOI:https://doi.org/10.1063/1.4922319· OSTI ID:22415306

Elmustafa, A. A. ^[1]; Hernandez-Garcia, C.; Poelker, M. ^[2]

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1. Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, Virginia 23529 (United States)
2. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)

CsK{sub 2}Sb photocathodes with quantum efficiency on the order of 10% at 532 nm, and lifetime greater than 90 days at low voltage, were successfully manufactured via co-deposition of alkali species emanating from an effusion source. Photocathodes were characterized as a function of antimony layer thickness and alkali consumption, inside a vacuum chamber that was initially baked, but frequently vented without re-baking. Photocathode lifetime measured at low voltage is correlated with the antimony layer thickness. Photocathodes manufactured with comparatively thick antimony layers exhibited the best lifetime. We speculate that the antimony layer serves as a reservoir, or sponge, for the alkali.

• OSTI ID: 22415306
• Journal Information: APL materials, Vol. 3, Issue 6; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2166-532X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIMONIDES
ANTIMONY
CESIUM COMPOUNDS
CORRELATIONS
DEPOSITION
DIFFUSION
ELECTRIC POTENTIAL
LAYERS
LIFETIME
PHOTOCATHODES
POTASSIUM COMPOUNDS
QUANTUM EFFICIENCY
THICKNESS