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

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.
Authors:
;  [1] ;  [2] ; ;  [3]
  1. Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, Virginia 23529 (United States)
  2. (United States)
  3. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
Publication Date:
OSTI Identifier:
22415306
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 3; Journal Issue: 6; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIMONIDES; ANTIMONY; CESIUM COMPOUNDS; CORRELATIONS; DEPOSITION; DIFFUSION; ELECTRIC POTENTIAL; LAYERS; LIFETIME; PHOTOCATHODES; POTASSIUM COMPOUNDS; QUANTUM EFFICIENCY; THICKNESS