Münster 1997 – wissenschaftliches Programm
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O: Oberflächenphysik
O 6: POSTER I
O 6.33: Poster
Montag, 17. März 1997, 14:15–15:45, AULA
High-Resolution Core-Level and STM Study of the Annealed Li/Si(100) Surface — •L.S.O. Johansson1, M.K.-J. Johansson2, S.M. Gray2, and K.O. Magnusson3 — 1Experimentelle Physik I, Univ. Dortmund, D-44221 Dortmund — 2Dept. of Synchrotron Rad. Research, Inst. of Physics, Lund Univ., Box 118, S-221 00 Lund, Sweden — 3Dept. of Natural Science, Univ. of Karlstad, Box 9501, S-650 09 Karlstad, Sweden
Alkali metal adsorption on silicon surfaces is a subject of widespread interest in surface science. Lithium is different from other alkalis in that it reacts strongly with the Si substrate at high coverages and forms an amorphous Li-silicide. By annealing the substrate during or after Li deposition, ordered Li-induced reconstructions can be formed. In the present work we have studied the annealed Li/Si(100) surface with high-resolution core-level spectroscopy and with scanning tunnelling microscopy (STM). By evaporating Li onto a heated sample, an ordered surface structure was obtained, with an apparent c(16x2) periodicity, as observed with LEED. Both the core-level spectroscopy data and the STM images gave further evidence that the surface is significantly rearranged compared to the clean surface. The STM images show a striped surface structure consistent with the LEED pattern. The Si 2p core-level spectra show two surface-shifted components with roughly equal intensity, indicating that the Si atoms in the top Si layer have two distinctly different sites.