METAL-SEMICONDUCTOR (Si, GaAs) INTERFACES
Résumé
The FN plots for Si tips are classified into lines and curves depending on the thickness of the surface oxide film, but the FN plots for a GaAs tip shows only straight lines. A double peak structure in the energy distribution curve has been observed on the field desorbed surface at medium field after deposition of 1-2 ML of Al onto a Si surface. However, with increasing the amount of deposition of Al to 3 ML on the Si surface, the double peaks disappear completely. This result suggests that the surface layers are perfectly metallized even at room temperature. An oxide film, thinner than that on a Si surface, formed on the GaAs surface and the surface composite atoms of GaAs can easily be desorbed by field desorption. An intrinsic potential drop disappears suddenly at a certain field, that is, the surface region of the field desorbed tip is composed of metallic species.
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Origine : Accord explicite pour ce dépôt