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Characterization of Nano-crystalline Diamond Films Grown Under Continuous DC Bias During Plasma Enhanced Chemical Vapor Deposition

Published online by Cambridge University Press:  31 January 2011

Vincent Mortet
Affiliation:
Liang Zhang
Affiliation:
[email protected], University of Antwerp, Electron Microscopy for Materials Science, Antwerp, Belgium
Maxie Echert
Affiliation:
[email protected], University of Antwerp, Research group PLASMANT, Antwerp, Belgium
Ali Soltani
Affiliation:
[email protected], Institut d'Electronique de Microélectonique et de Nanotechnologie, Villeneuve d'Ascq, France
Jan D'Haen
Affiliation:
[email protected], Hasselt University, Institute for Materials Research, Diepenbeek, Belgium
Olivier Douhéret
Affiliation:
[email protected], MateriaNova Research Center, Service de la Chimie des Materiaux Nouveaux, Mons, Belgium
Myriam Moreau
Affiliation:
[email protected], Laboratoire de Spectrochimie Infrarouge et Raman, Villeneuve d'Ascq, France
Sebastian Osswald
Affiliation:
[email protected], Drexel University, Department of Materials Science and Engineering and A. J. Drexel Nanotechnology Institute, Philadelphia, Pennsylvania, United States
Erik Neyts
Affiliation:
[email protected], University of Antwerp, Research group PLASMANT, Antwerp, Belgium
David Troadec
Affiliation:
[email protected], Institut d'Electronique de Microélectonique et de Nanotechnologie, Villeneuve d'Ascq, France
Patrick Wagner
Affiliation:
[email protected], Hasselt University, Institute for Materials Research, Diepenbeek, Belgium
Annemie Bogaerts
Affiliation:
[email protected], University of Antwerp, Research group PLASMANT, Antwerp, Belgium
Gustaaf Van Tendeloo
Affiliation:
[email protected], University of Antwerp, Electron Microscopy for Materials Science, Antwerp, Belgium
Ken Haenen
Affiliation:
[email protected], Hasselt University, Institute for Materials Research, Diepenbeek, Belgium
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Abstract

Nanocrystalline diamond films have generated much interested due to their diamond-like properties and low surface roughness. Several techniques have been used to obtain a high re-nucleation rate, such as hydrogen poor or high methane concentration plasmas. In this work, the properties of nano-diamond films grown on silicon substrates using a continuous DC bias voltage during the complete duration of growth are studied. Subsequently, the layers were characterised by several morphological, structural and optical techniques. Besides a thorough investigation of the surface structure, using SEM and AFM, special attention was paid to the bulk structure of the films. The application of FTIR, XRD, multi wavelength Raman spectroscopy, TEM and EELS yielded a detailed insight in important properties such as the amount of crystallinity, the hydrogen content and grain size. Although these films are smooth, they are under a considerable compressive stress. FTIR spectroscopy points to a high hydrogen content in the films, while Raman and EELS indicate a high concentration of sp2 carbon. TEM and EELS show that these films consist of diamond nano-grains mixed with an amorphous sp2 bonded carbon, these results are consistent with the XRD and UV Raman spectroscopy data.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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