Germanium Adsorption on Ag(111): An AES-LEED and STM Study
The adsorption of germanium on Ag(111) has been investigated using Scanning Tunneling Microscopy, Auger Electron Spectroscopy and Low Energy Electron Diffraction. From the shape of the Auger peak-to-peak versus time curves, we deduce that at room temperature the growth mode is nearly layer–by–layer at least for the first two layers. In the sub-monolayer range, the growth starts by the formation of a (√3 × √3)R30° surface superstructure which is complete at 1/3 mono-layer coverage. Beyond this coverage a rectangular c(√3 × 7) superstructure is observed. STM images reveal that this last reconstruction is formed by an ordered arrangement of self-assembled Ge tetramers giving rise to a surprising undulation of the surface.
Keywords: AES; AUGER; GE NANOSTRUCTURES; LEED; SELF-ORGANIZATION; SILVER; STM
Document Type: Research Article
Publication date: 01 September 2007
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