Author: Liu, F.
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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