Author: Attenkofer, K.
Paper Title Page
MOPPP049 Deposition and In-Situ Characterization of Alkali Antimonide Photocathodes 670
  • X. Liang
    SBU, Stony Brook, New York, USA
  • K. Attenkofer
    ANL, Argonne, USA
  • I. Ben-Zvi, M. Ruiz-Osés
    Stony Brook University, Stony Brook, USA
  • H.A. Padmore, T. Vecchione
    LBNL, Berkeley, California, USA
  • S.G. Schubert
    HZB, Berlin, Germany
  • J. Smedley
    BNL, Upton, Long Island, New York, USA
  Funding: This work was supported by the Director, Office of Science, Office of Basic Energy Sciences of the U. S. Department of Energy, under Contract No. KC0407-ALSJNT-I0013, and DE-SC0005713.
Alkali antimonide cathodes have the potential to provide high quantum efficiency for visible light, and are significantly more tolerant of vacuum contaminants than GaAs, so they are attractive for high-average-current photoinjectors to generate high quality electron beams. These cathodes are crystalline; however, standard growth recipes used today do not produce large crystals. We have grown multi-alkali cathodes on silicon and molybdenum substrates with in-situ X-ray diffraction (XRD) and X-ray reflection (XRR) analysis. The correlation of the cathode structure to the growth parameters and quantum efficiency was explored. During the deposition and evaporation of Sb and K layers, the possibility of selective growth of specific crystalline orientation was observed via X-ray diffraction.