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Nucleation and Growth of Cubic Boron Nitride Films Produced by Ion-Assisted Pulsed Laser Deposition

Published online by Cambridge University Press:  22 February 2011

T. A. Friedmann ,
D. L. Medlin ,
P. B. Mirkarimi ,
K. F. McCarty ,
E. J. Klaus ,
D. R. Boehme ,
H. A. Johnsen ,
M. J. Mills ,
D. K. Ottesen  and
J. C. Barbour
T. A. Friedmann
Affiliation:
Current address: Sandia National Laboratories, Albuquerque, NM 87185
D. L. Medlin
Affiliation:
Sandia National Laboratories, Livermore CA, 94551
P. B. Mirkarimi
Affiliation:
Sandia National Laboratories, Livermore CA, 94551
K. F. McCarty
Affiliation:
Sandia National Laboratories, Livermore CA, 94551
E. J. Klaus
Affiliation:
Sandia National Laboratories, Livermore CA, 94551
D. R. Boehme
Affiliation:
Sandia National Laboratories, Livermore CA, 94551
H. A. Johnsen
Affiliation:
Sandia National Laboratories, Livermore CA, 94551
M. J. Mills
Affiliation:
Sandia National Laboratories, Livermore CA, 94551
D. K. Ottesen
Affiliation:
Sandia National Laboratories, Livermore CA, 94551
J. C. Barbour
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
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Abstract

We are studying the boron nitride system by using a pulsed excimer laser to ablate from hexagonal BN (hBN) targets to form cubic BN (cBN) films. We are depositing BN films on heated (25 - 800°C) Si (100) surfaces and are using a broad-beam ion source operated with Ar and N2 source gasses to produce BN films with a high percentage of sp3-bonded cBN. In order to understand and optimize the growth and nucleation of cBN films, parametric studies of the growth parameters have been performed. The best films to date show >85% sp3-bonded BN as determined from Fourier-transform infrared (FTIR) reflection spectroscopy. High resolution transmission electron microscopy (TEM) and selected area electron diffraction confirm the presence of cBN in these samples. The films are polycrystalline and show grain sizes up to 30- 40 nm. We find from both the FTIR and TEM analyses that the cBN content in these films evolves with growth time. Initially, the films are deposited as hBN and the cBN nucleates on this hBN underlayer. Importantly, the position of the cBN IR phonon also changes with growth time. Initially this mode appears near 1130 cm-1 and the position decreases with growth time to a constant value of 1085 cm-1. Since in bulk cBN this IR mode appears at 1065 cm-1, a large compressive stress induced by the ion bombardment is suggested. In addition, we report on the variation in cBN percentage with temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 316: Symposium A – Materials Synthesis and Processing Using Ion Beams , 1993 , 959
Copyright
Copyright © Materials Research Society 1994

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References

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