First-principles study of the interaction of hydrogen with GaAs(001)
The relative stabilities of various possible structures for hydrogen terminated GaAs(001) surfaces have been studied at coverages ranging from 0.5 to 2.0 hydrogen atoms per surface gallium atom. We have used the local density approximation with a localized atomic orbital basis set and norm conservin...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2003 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/25195 |
| Acceso en línea: | http://hdl.handle.net/10261/25195 |
| Access Level: | acceso abierto |
| Palabra clave: | Surface reconstruction Hydrogen GaAs Density functional theory |
| Sumario: | The relative stabilities of various possible structures for hydrogen terminated GaAs(001) surfaces have been studied at coverages ranging from 0.5 to 2.0 hydrogen atoms per surface gallium atom. We have used the local density approximation with a localized atomic orbital basis set and norm conserving pseudopotentials. The results are compared with experimental scanning tunneling microscopy images of these surfaces. We have also mapped the total energy of the system during recombinative desorption as a function of the hydrogen atomic coordinates and deduced thermal desorption rates from this data. It is concluded that hydrogen exposure of the GaAs(001)-c(4×4) reconstructed surface leads to H-Ga terminated surfaces with a hydrogen coverage between 0.5 and 1 hydrogen atoms per surface gallium atom and mixed c(4×2) and c(2×2) domains. Terminal and bridging hydrogen adsorption sites are identified. |
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