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Title: Direct observation of bi-alkali antimonide photocathodes growth via in operando x-ray diffraction studies

Alkali antimonides have a long history as visible-light-sensitive photocathodes. This work focuses on the process of fabrication of the bi-alkali photocathodes, K{sub 2}CsSb. In-situ synchrotron x-ray diffraction and photoresponse measurements were used to monitor phase evolution during sequential photocathode growth mode on Si(100) substrates. The amorphous-to-crystalline transition for the initial antimony layer was observed at a film thickness of 40 Å . The antimony crystalline structure dissolved upon potassium deposition, eventually recrystallizing upon further deposition into K-Sb crystalline modifications. This transition, as well as the conversion of potassium antimonide to K{sub 2}CsSb upon cesium deposition, is correlated with changes in the quantum efficiency.
Authors:
; ; ;  [1] ;  [2] ;  [3] ; ; ;  [4] ; ; ;  [5] ;  [6]
  1. Stony Brook University, Stony Brook, New York 11794 (United States)
  2. Helmholtz-Zentrum Berlin, Albert-Einstein Str. 15, 12489 Berlin (Germany)
  3. (United States)
  4. Brookhaven National Laboratory, Upton, New York 11973 (United States)
  5. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  6. Argonne National Laboratory, Lemont, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22415226
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 2; Journal Issue: 12; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMORPHOUS STATE; ANTIMONIDES; CESIUM COMPOUNDS; CRYSTAL GROWTH; CRYSTAL STRUCTURE; DEPOSITION; FILMS; LAYERS; PHASE TRANSFORMATIONS; PHOTOCATHODES; POTASSIUM COMPOUNDS; QUANTUM EFFICIENCY; SILICON; SUBSTRATES; SYNCHROTRON RADIATION; THICKNESS; X-RAY DIFFRACTION