Effect of Sb thickness on the performance of bialkali-antimonide photocathodes
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
The alkali species Cs and K were codeposited using an effusion source, onto relatively thick layers of Sb (50 nm to ~7 μm) grown on GaAs and Ta substrates inside a vacuum chamber that was baked and not-vented, and also baked and vented with clean dry nitrogen but not rebaked. The characteristics of the Sb films, including sticking probability, surface roughness, grain size, and crystal properties were very different for these conditions, yet comparable values of photocathode yield [or quantum efficiency (QE)] at 284 V were obtained following codeposition of the alkali materials. Photocathodes manufactured with comparatively thick Sb layers exhibited the highest QE and the best 1/e lifetime. As last, the authors speculate that the alkali codeposition enabled optimized stoichiometry for photocathodes manufactured using thick Sb layers, which could serve as a reservoir for the alkali materials.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- DMR-0420304; FG02-97ER45625, AC05-06OR23177; FG02-97ER45625
- OSTI ID:
- 1325692
- Alternate ID(s):
- OSTI ID: 1421142
- Report Number(s):
- JLAB-ACC-16-2351; DOE/OR/23177-3948; JVTAD6
- Journal Information:
- Journal of Vacuum Science and Technology A, Vol. 34, Issue 2; ISSN 0734-2101
- Publisher:
- American Vacuum SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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