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The Interaction of Carbon with the Diamond Surface: A Photoelectron Spectroscopy Study

Published online by Cambridge University Press:  10 February 2011

P. Reinke ,
T. Wrase ,
K. Müller ,
P. Oelhafen  and
R. Locher
P. Reinke
Affiliation:
Universität Basel, Institut für Physik, Klingelbergstr. 82, 4056 Basel, Switzerland, [email protected]
T. Wrase
Affiliation:
Universität Basel, Institut für Physik, Klingelbergstr. 82, 4056 Basel, Switzerland, [email protected]
K. Müller
Affiliation:
Universität Basel, Institut für Physik, Klingelbergstr. 82, 4056 Basel, Switzerland, [email protected]
P. Oelhafen
Affiliation:
Universität Basel, Institut für Physik, Klingelbergstr. 82, 4056 Basel, Switzerland, [email protected]
R. Locher
Affiliation:
Fraunhofer Institut für Angewandte Festkörperphysik, Tullastr.72, 79108 Freiburg, Germany
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Abstract

The modification of the diamond surface through adsorbants offers the opportunity to adjust the electronic and electron emission properties of the surface. In the study presented here, we deposited between 0.1 and 100 monolayers of carbon from an electron beam evaporation source on polycrystalline diamond films. Photoelectron spectroscopy in the ultraviolet and X-ray regime was employed to characterize the surface. Observations on a (100) polycrystalline diamond film show, that the surface is first depleted of hydrogen and subsequent growth of an amorphous carbon film (a-C) occurs on the reconstructed surface. The deposition of these ultrathin carbon films allows the controlled introduction of sp2carbon and p-π states onto the diamond surface. The field emission current increases considerably with the amount of sp2-carbon accumulated at the diamond surface. The current-voltage characteristics only partially follow the Fowler-Nordheim equation, and the results obtained for different films are described and possible emission mechanism discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 498: Symposium AA – Covalently Bonded Disordered Thin-Film Materials , 1997 , 77
Copyright
Copyright © Materials Research Society 1998

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References

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