Applied Physics A

, Volume 52, Issue 3, pp 171–179 | Cite as

Alkali metal intercalation into SnS2

UHV investigations of (0001) surfaces
  • M. Bronold
  • C. Pettenkofer
  • W. Jaegermann
Solids And Materials

Abstract

The intercalation of sodium and potassium into the layered semiconductor SnS2 has been investigated by ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED), and ion scattering spectroscopy (ISS). After deposition of the alkali metals onto (0001) cleavage planes of SnS2 in ultra high vacuum (UHV), semiconducting intercalation phases were formed. They seem to be homogeneous and disordered under the given experimental conditions. The valence electrons of the alkali metals are transferred into electronic states of the host lattice, whose valence band density of states changes significantly during intercalation. The underlying changes of the binding properties of the host lattice are discussed. The course of intercalation can be separated into three phases. During an induction period the concentration of the alkali metal on the surface remains very small, the electronic states of the substrate are shifted by band bending. During an intercalation period the topotactic reaction proceeds. After reaching saturation compositions of the intercalation phase at the surface, the alkali metal diffuses into the bulk. Crystal or surface defects seem to have a significant influence on the kinetics of intercalation and on the stoichiometry of the intercalation compounds.

PACS

68.65 79.60.Eq 

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • M. Bronold
    • 1
  • C. Pettenkofer
    • 1
  • W. Jaegermann
    • 1
  1. 1.Hahn-Meitner-Institut, Bereich S1Berlin 39Fed. Rep. Germany

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