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Low Energy Ion Scattering Studies of Sodium Segregation in ZnO

  • C. Creemers
  • H. Van Hove
  • A. Neyens

Abstract

The segregation of Na and K, native sub ppm bulk impurities in ZnO is studied on its polar surfaces using photoemission and low energy ion scattering techniques. On the (000\(\overline 1 \))-face, the resulting lowering of the electrostatic surface energy acts as a strong additional segregation force. The angular dependence of the ion intensities, backscattered from the segregated Na, shows that the Na atoms are slightly protruding out of the (000\(\overline 1 \)) surface.

Keywords

Polar Surface Peak Height Ratio Neutralization Probability Total Scattering Cross Section Ultra High Vacuum Condition 
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References

  1. 1.
    Aspirant N.F.W.O. Belgium.Google Scholar
  2. 2.
    B.J. Hopkins, R. Leysen and P.A. Taylor, Surface Science 48, 486 (1975).ADSCrossRefGoogle Scholar
  3. 3.
    L. Monard, H. Van Hove and A. Neyens, Comptes rendus des Travaux du Troisième Colloque de Physique et Chimie des Surfaces, Grenoble 1977. Le Vide, supplément au Nº 185 (1977).Google Scholar
  4. 4.
    R.W. Nosker and P. Mark, Surface Science 20, 421 (1970).ADSCrossRefGoogle Scholar
  5. 5.
    F. Humblet, H. Van Hove and A. Neyens, Surface Science 68, 178 (1977).ADSCrossRefGoogle Scholar
  6. 6.
    To be published.Google Scholar
  7. 7.
    Also H.H. Brongersma, private communication.Google Scholar
  8. 8.
    E. Taglauer and W. Heiland, Surface Science 47, 234 (1975)ADSCrossRefGoogle Scholar
  9. 8.a
    H.H. Brongersma and T.M. Buck, Surface Science 53, 649 (1975)ADSCrossRefGoogle Scholar
  10. 8.b
    P. Bertrand and F. Delannay, Ph. D. thesis (1976), Université Catholique de Louvain, Louvain-la-Neuve.Google Scholar
  11. 9.
    M.T. Robinson, ORNL report n° 4556.Google Scholar

Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • C. Creemers
    • 1
  • H. Van Hove
    • 1
  • A. Neyens
    • 1
  1. 1.Fysico-chemisch laboratoriumKatholieke Universiteit LeuvenLeuvenBelgium

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