Growth of ultrathin Cu films on CaO(100)

The deposition of Cu on a CaO(100) surface at 300 K by electron beam evaporation was studied by AES, EELS, and LEED. The AES growth curves show breaks at a Cu coverage of 1.8×10 15 cm −2. At this coverage, a sharp (1×1) LEED pattern is observed. The lattice mismatch between Cu and CaO(100) is −6%, a...

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Bibliographic Details
Published in:Surface science 1999-09, Vol.439 (1), p.139-145
Main Authors: Neergaard Waltenburg, Hanne, Møller, Preben J.
Format: Article
Language:English
Subjects:
Auger electron spectroscopy
Calcium oxide
Condensed matter: structure, mechanical and thermal properties
Copper
Cross-disciplinary physics: materials science
rheology
Electron energy loss spectroscopy (EELS)
Exact sciences and technology
Growth
Low-energy electron diffraction (LEED)
Low-index single crystal surfaces
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Physics
Structure and morphology
thickness
Surface electronic phenomena
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Thin film structure and morphology
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Summary:The deposition of Cu on a CaO(100) surface at 300 K by electron beam evaporation was studied by AES, EELS, and LEED. The AES growth curves show breaks at a Cu coverage of 1.8×10 15 cm −2. At this coverage, a sharp (1×1) LEED pattern is observed. The lattice mismatch between Cu and CaO(100) is −6%, and the break point coverage of 1.8×10 15 cm −2 corresponds to the expected coverage for a compressed Cu(100) layer. These results thus suggest that initially a c(1×1) Cu layer is formed on the CaO(100) surface. Furthermore, the EEL spectra show a clear reduction in the CaO surface plasmon peak at the break point coverage, and a Cu related peak is observed around 5 eV. For higher coverages, e.g. corresponding to five Cu layers, the growth mode is 3D. Furthermore, changes in the Auger spectra and LEED patterns observed upon annealing to 525 K show that the Cu monolayer film agglomerates into 3D particles, uncovering the CaO(100) surface.
ISSN:0039-6028
1879-2758
DOI:10.1016/S0039-6028(99)00751-7