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Proceedings Paper

Diamond films grown from fullerene precursors
Author(s): Dieter M. Gruen; Christopher D. Zuiker; Alan R. Krauss
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Paper Abstract

Fullerene precursors have been shown to result in the growth of diamond films from argon microwave plasmas. In contradistinction to most diamond films grown using conventional methane-hydrogen mixtures, the fullerene-generated films are nanocrystalline and smooth on the nanometer scale. They have recently been shown to have friction coefficients approaching the values of natural diamond. It is clearly important to understand the development of surface morphology during film growth from fullerene precursors and to elucidate the factors leading to surface roughness when hydrogen is present in the chemical vapor deposition (CVD) gas mixtures. To achieve these goals, we are measuring surface reflectivity of diamond films growing on silicon substrates over a wide range of plasma processing conditions. A model for the interpretation of the laser interferometric data has been developed, which allows one to determine film growth rate, root mean square (rms) surface roughness, and bulk losses due to scattering and absorption. The rms roughness values determined by reflectivity are in good agreement with atomic force microscope (AFM) measurements. A number of techniques, including high-resolution transmission electron microscopy (HRTEM) and near-edge x-ray absorption fine structure (NEXAFS) measurements, have been used to characterize the films. A mechanism for diamond-film growth involving the C2 molecule as a growth species is presented. The mechanism is based on (1 the observation that the optical emission spectra of the fullerene-containing plasmas are dominated by the Swan bands of C2 and (2) the ability of C2 to insert directly into C-H and C-C bonds with low activation energy barriers, as shown by recent theoretical calculations of reactions of C2 with carbon clusters.

Paper Details

Date Published: 8 December 1995
PDF: 12 pages
Proc. SPIE 2530, Fullerenes and Photonics II, (8 December 1995); doi: 10.1117/12.228105
Show Author Affiliations
Dieter M. Gruen, Argonne National Lab. (United States)
Christopher D. Zuiker, Argonne National Lab. (United States)
Alan R. Krauss, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 2530:
Fullerenes and Photonics II
Zakya H. Kafafi, Editor(s)

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