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Evaluation Of Amorphous Diamond-Like Carbon And Boron Nitride Films As Low Permittivity Dielectrics

Published online by Cambridge University Press:  15 February 2011

J. P. Sullivan
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
T. A. Friedmann
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
C. A. Apblett
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
M. P. Siegal
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
N. Missert
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
M. L. Lovejoy
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
P. B. Mirkarimi
Affiliation:
Sandia National Laboratories, Livermore, CA 94551
K. F. McCarty
Affiliation:
Sandia National Laboratories, Livermore, CA 94551
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Abstract

Although films of diamond-like carbon (DLC) and hexagonal boron nitride (h-BN) have shown low dielectric constants in the range of 3 to 4, these materials have been unsuitable for use as interconnect dielectrics due to poor thermal stability and environmental degradation. These deficiencies can be addressed by depositing DLC films free of hydrogen (a-tC) and depositing the cubic phase of BN (c-BN). The dielectric characteristics of hydrogen-free DLC and c-BN that have been deposited by pulsed-laser deposition (PLD) have been evaluated using metal-insulator-metal and metal-insulator-semiconductor structures. For comparison, the dielectric characteristics of h-BN deposited by electron cyclotron resonance (ECR) were also evaluated. Despite the superior thermal and environmental stability of the a-tC and c-BN films and the attractively low deposition thermal budget (room temperature deposition for a-tC films, 400°C for c-BN films), the films exhibit dielectric constants comparable to those of bulk diamond and bulk BN, ∼ 6. Furthermore, the a-tC and c-BN films exhibit high compressive stress in the GPa range which limits their usefulness only to those applications requiring a thin dielectric layer, e.g. diffusion barriers or encapsulants.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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Evaluation Of Amorphous Diamond-Like Carbon And Boron Nitride Films As Low Permittivity Dielectrics
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