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In situ Monitoring of the Effects of Gas Mixtures on Ion Beam Depositions of Diamond-Like Carbon Films

Published online by Cambridge University Press:  10 February 2011

R. L. C. Wu ,
W. Lanter ,
R. Monreal ,
P. B. Kosel  and
K. Miyoshi
R. L. C. Wu
Affiliation:
K Systems Corporation, 1522 Marsetta Drive, Beavercreek, Ohio 45432
W. Lanter
Affiliation:
K Systems Corporation, 1522 Marsetta Drive, Beavercreek, Ohio 45432
R. Monreal
Affiliation:
University of Cincinnati, Department of Electrical and Computer Engineering, Cincinnati, Ohio 45221
P. B. Kosel
Affiliation:
University of Cincinnati, Department of Electrical and Computer Engineering, Cincinnati, Ohio 45221
K. Miyoshi
Affiliation:
NASA Lewis Research Center, Cleveland, Ohio 45135
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Abstract

A quadrupole mass spectrometer and a total ion-current measuring device have been utilized to monitor the ion compositions of gas mixtures of CH4/H2 and CH4/H2/O2 during the deposition for quality control and process optimization. An ultra high vacuum system using a 20 cm diameter RF excited (13.56 MIfz) ion gun and a four-axis substrate scanner has been developed for deposition of diamond-like carbon films for electrical, optical, and tribological applications. At a constant RF power of 179W, the mass spectra of gas mixture CH4/H2 (1:2.5) showed the most abundant ion is CH3+. Addition of O2 to the ion source has been found to affect the adhesion, deposition rate, and physical and chemical properties of the DLC films. By use of a mass spectrometer with and without the electron beam, the degree of ionization of CH4 was calculated to be about 10%. As the concentration of O2 was increased, all hydrocarbon ions decreased and H3O+ increased, resulting in a decrease in the film growth rate and an increase in etching of Si and glass substrates. In general, the optical bandgap, adsorption coefficients and refractive index decreased as oxygen concentration increased. Raman spectra showed the G-peak position shifted toward the graphitic peak with narrow peak width as oxygen concentration increased. At ultra high vacuum, the coefficient of friction increased with increased adhesion on substrates as oxygen was increased.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 502: Symposium II – In Situ Process Diagnostics & Intelligent Materials Processing , 1997 , 263
Copyright
Copyright © Materials Research Society 1998

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References

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