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Title: Correlation of CsK 2 Sb photocathode lifetime with antimony thickness

Journal Article · · APL Materials
DOI:https://doi.org/10.1063/1.4922319· OSTI ID:1184357
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CsK2Sb 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.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-97ER45625; DMR-0420304
OSTI ID:
1184357
Alternate ID(s):
OSTI ID: 1208587; OSTI ID: 1421211
Journal Information:
APL Materials, Journal Name: APL Materials Vol. 3 Journal Issue: 6; ISSN 2166-532X
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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36 MATERIALS SCIENCE