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Title: In-situ synchrotron x-ray characterization of K2CsSb photocathode grown by ternary co-evaporation

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4975113· OSTI ID:1456887
 [1];  [2];  [2];  [3];  [4];  [4];  [1];  [2]
  1. Stony Brook Univ., NY (United States). Department of Materials Science and Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
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K2CsSb is a promising photocathode candidate to serve as an electron source in next-generation light sources such as Free Electron Lasers (FEL) and Energy Recovery Linacs (ERL). As the traditional recipe for creation of K2CsSb photocathodes typically results in a rough surface that deteriorates electron beam quality, significant effort has been made to explore novel growth methods for K2CsSb photocathodes. In this work, a method of ternary co-evaporation of K, Cs, and Sb is described. By using in-situ synchrotron X-ray techniques, the quality of the photocathode is characterized during and after the growth. K2CsSb photocathodes grown by this method on Si (100) and MgO (001) substrates show strong (222) texture, and the two photocathodes exhibit 1.7% and 3.4% quantum efficiencies at a wavelength of 530 nm, with a rms surface roughness of about 2–4 nm. Finally, this represents an order of magnitude reduction in roughness compared to typical sequential deposition and should result in a significant improvement in the brightness of the generated electron beam.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); Small Business Innovation Research; National Science Foundation (NSF); National Institute of Health
Grant/Contract Number:
SC0012704; SC0009540
OSTI ID:
1456887
Report Number(s):
BNL-205787-2018-JAAM; TRN: US1901252
Journal Information:
Journal of Applied Physics, Vol. 121, Issue 5; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

References (10)

A low emittance and high efficiency visible light photocathode for high brightness accelerator-based X-ray light sources journal July 2011
Chemical and structural characteristics of the potassium-cesium-antimony photocathode journal January 1965
Bi-alkali antimonide photocathodes for high brightness accelerators journal September 2013
A multiplatform code for the analysis of energy-dispersive X-ray fluorescence spectra journal January 2007
Direct observation of bi-alkali antimonide photocathodes growth via in operando x-ray diffraction studies journal December 2014
Near atomically smooth alkali antimonide photocathode thin films journal January 2017
Competition between surface and strain energy during grain growth in free-standing and attached Ag and Cu films on Si substrates journal February 2002
Bi-alkali antimonide photocathode growth: An X-ray diffraction study journal July 2016
Effects of strain energy on the preferred orientation of TiN thin films journal August 1993
Thermal stability of photovoltaic a-Si:H determined by neutron reflectometry journal December 2014

Figures / Tables (5)

FIG. 1(p. 5)figure FIG. 1
TABLE I(p. 5)table TABLE I
FIG. 2(p. 6)figure FIG. 2
FIG. 3(p. 7)figure FIG. 3
FIG. 4(p. 7)figure FIG. 4

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS