Volume 47, Number 5, September I 1999
|Page(s)||633 - 639|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
The polycrystalline diamond (100)/amorphous carbon heterostructure
Institut für Physik, Universität Basel - Klingelbergstr. 82, 4056 Basel, Switzerland
2 Fraunhofer Institut für Angewandte Festkörperphysik Tullastr.72, 79108 Freiburg, Germany
Accepted: 2 July 1999
In this study the interaction of the diamond surface with carbon is examined. Carbon, supplied by electron beam evaporation, is deposited on a polycrystalline diamond film of (100) orientation. The interface formation and carbon film growth are monitored by photoelectron spectroscopy in the ultraviolet (UPS) and X-ray (XPS) regime. The deposition of small amounts of carbon triggers changes in the surface structure of diamond, evidenced by an increase in the intensity of peaks located below 4 eV binding energy. Subsequently the deposition of amorphous carbon (a-C) leads to an abrupt interface. The analysis of the XPS data indicates a growth mode of the overlayer close to a layer-by-layer growth. The microscopic structure of the boundary layer between diamond and a-C is still a subject of discussion and several models are suggested. The diamond/amorphous carbon heterostructure is an example of a crystalline-amorphous heterostructure where both components are formed by the same element.
PACS: 79.60.Jv – Interfaces; heterostructures; nanostructures / 81.05.Tp – Fullerenes and related materials; diamonds, graphite / 61.43.Er – Other amorphous solids
© EDP Sciences, 1999
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