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Insights into the ion-assisted nucleation of diamond on silicon

Published online by Cambridge University Press:  31 January 2011

Sean P. McGinnis
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
Michael A. Kelly
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
Stig B. Hagström
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
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Abstract

The ion-assisted nucleation of diamond was studied in a microwave plasma chemical vapor deposition system to gain insights into the processes controlling this phenomenon. The dependence of the nucleation density on bias voltage and temperature, as well as experiments with an electrically isolated substrate, are consistent with an ion bombardment mechanism for diamond nucleation. However, the growth of these nuclei is dominated by neutral species rather than ions. Measurements of the bias current under various conditions also provide details on the roles of the incident ion flux and substrate electron emission during this process. Furthermore, Monte Carlo simulations of the ion energy distribution at the substrate are compared to experimental measurements. Preferential sputtering, thermal spike, and carbon subplantation nucleation mechanisms are assessed based on the experimental and modeling results.

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Articles
Copyright
Copyright © Materials Research Society 1997

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