STM study of gold on Ge (111)
The gold-induced reconstructions of Au on Ge(111 ) were investigated with STM, LEED and RHEED in the coverage region up to one monolayer. The STM images of the (√3 × √3)R30° Au structure are compared with those of other noble metal-semiconductor adsorbate systems. Two types of √3 reconstructed islan...
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| Veröffentlicht in: | Surface science 1994-10, Vol.318 (1-2), p.21-28 |
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| creator | Seehofer, L. Johnson, R.L. |
| description | The gold-induced reconstructions of Au on Ge(111 ) were investigated with STM, LEED and RHEED in the coverage region up to one monolayer. The STM images of the (√3 × √3)R30° Au structure are compared with those of other noble metal-semiconductor adsorbate systems. Two types of √3 reconstructed islands were found on terraces either above or below the top double layer of the original c(2 × 8) reconstructed surface. The ratio of the areas of the two different √3 reconstructed islands allowed us to determine that the number density of Ge atoms in the √3 reconstruction corresponds to a coverage of one monolayer and provides convincing evidence for a missing top layer model. In the low coverage regime it was found that small amounts of Au stabilize single √3 unit cells which lead to the formation of a hexagonal domain wall phase. The results obtained from the Au stabilized domain wall phase are compared to those of the high temperature I(2 × 2) phase of clean Ge(111). |
| doi_str_mv | 10.1016/0039-6028(94)90337-9 |
| format | Article |
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The STM images of the (√3 × √3)R30° Au structure are compared with those of other noble metal-semiconductor adsorbate systems. Two types of √3 reconstructed islands were found on terraces either above or below the top double layer of the original c(2 × 8) reconstructed surface. The ratio of the areas of the two different √3 reconstructed islands allowed us to determine that the number density of Ge atoms in the √3 reconstruction corresponds to a coverage of one monolayer and provides convincing evidence for a missing top layer model. In the low coverage regime it was found that small amounts of Au stabilize single √3 unit cells which lead to the formation of a hexagonal domain wall phase. 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| issn | 0039-6028 1879-2758 |
| language | eng |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Condensed matter: structure, mechanical and thermal properties Exact sciences and technology Physics Solid surfaces and solid-solid interfaces Surface structure and topography Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) |
| title | STM study of gold on Ge (111) |
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