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Epitaxy, Oxidation and Surface Structure of Copper on Gold Films by High Resolution Electron Microscopy

Published online by Cambridge University Press:  25 February 2011

William Krakow  and
Victor Cast˜no
William Krakow
Affiliation:
IBM Corporation, Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598 USA
Victor Cast˜no
Affiliation:
IBM Corporation, Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598 USA
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Abstract

High resolution electron microscope studies were undertaken of the epitaxy and oxidation of thin layers (<30Å) of vapor deposited Cu on single crystal Au films. The metal/metal and oxide/metal orientation relationships were analyzed for both the diffraction and imaging modes, before and after the Cu oxidation was significant. For the oxide overlayers two cases were studied: (111) Cu which transforms into three (110) variants of Cu2O, each rotated by 120° and (110) Cu transforming to a layered (211) oxide overgrowth. A lateral displacement of the surface top layer of Cu atoms was found for the (110) orientation of Cu2O. The (211) orientation of Cu2O had two structural variants of surface ordering rotated by 90° relative to the underlying metal. One of these cases directly exhibits a 3.01Å × 7.39Å supercell structure characteristic of a 0.58Å atomic step height of the (211) planar layers perpendicular to the surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 94: Symposium D – Initial Stages of Epitaxial Growth , 1987 , 281
Copyright
Copyright © Materials Research Society 1987

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References

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