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 (mean square root of 3 x mean square root of 3)R30 degrees surface superstructure which is complete at 1/3 monolayer coverage. Beyond this coverage a rectangular c(mean square root of 3 x 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.
Oughaddou
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H
CRMN, Centre National de la Recherche Scientifique, Campus de Luminy, Case 913, 13288 Marseille Cedex 09, France.
Mayne
A
A
Aufray
B
B
Bibérian
J P
JP
Le Lay
G
G
Ealet
B
B
Dujardin
G
G
Kara
A
A
D000327:Adsorption; D000497:Alloys; D004563:Electrochemistry / Q000379:methods; D005857:Germanium / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D016252:Microscopy, Scanning Tunneling / Q000379:methods*; D008968:Molecular Conformation; D053758:Nanoparticles; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011868:Radioisotopes / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
D000497:Alloys; D011868:Radioisotopes; D005857:Germanium; D012834:Silver