Author: Biswas, J.P.
Paper Title Page
WEXC07
 Nucleation of Single Crystal Photocathode on Atomically Thin Graphene Substrate Using Co-Deposition of Cesium Telluride  
 
  • M. Gaowei, J. Cen, J. Sinsheimer, J. Walsh
    BNL, Upton, New York, USA
  • A.M. Alexander, F. Liu, V.N. Pavlenko, J. Smedley, H. Yamaguchi
    LANL, Los Alamos, New Mexico, USA
  • J.P. Biswas
    Stony Brook University, Stony Brook, USA
  • D.P. Juarez-Lopez
    The University of Liverpool, Liverpool, United Kingdom
  • S. Mistry
    HZB, Berlin, Germany
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
For the past decades, cesium telluride (CsTe) has been chosen as the electron source material for high bunch charge, high repetition rate superconducting radio frequency electron injectors. The application of cesium telluride photocathode has been reported by accelerators all over the world. Alkali based semiconductor photocathode material has always been vapor deposited thin films, with amorphous or very limited crystalline phases. The fragility of alkali-based photocathode partially comes from its disordered and unstable structure. The limited crystallinity also limits the quantum efficiency to improve. Therefore, growing large crystal or even single crystal of the alkali-based photocathode material is the goal of many scientific projects these days. Nucleation of cesium telluride crystalline phase was observed via co-deposition method on atomically thin graphene substrate, which is is a recognized sign of the first step of the formation of single crystal. In situ and operando X-ray characterization has been performed on this process and the results in the evolution of crystal structure, chemical stoichiometry as well as the surface morphology and quantum efficiency are reported. 		 
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