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Structural Studies of Hydrogenated Amorphous Carbon Infrared Coatings

Published online by Cambridge University Press:  25 February 2011

C. J. Robinson ,
M. G. Samant ,
J. Stohr ,
V. S. Speriosu ,
C. R. Guarnieri  and
J. J. Cuomo
C. J. Robinson
Affiliation:
IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
M. G. Samant
Affiliation:
IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
J. Stohr
Affiliation:
IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
V. S. Speriosu
Affiliation:
IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
C. R. Guarnieri
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
J. J. Cuomo
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
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Abstract

Hydrogenated amorphous carbon thin films are well known for their mechanical hardness and optical properties which make them useful for applications in infrared device coatings. In this work films have been prepared by plasma. decomposition of methane using an RF diode reactor operating under conditions of high self bias potential (Vb = 1 KeV). The resulting ion bombardment during film growth leads to the formation of hard, insulating carbon coatings which have a band gap of ≃1.1 eV and are transparent in the IR. Nuclear reaction analysis has been used to quantify the atomic concentration of hydrogen incorporated in the films and extended x-ray absorption fine structure (EXAFS) has been used to determine local site geometry. Only first and second nearest neighbor bond lengths are observed with no evidence of further long range order or microcrystallinity. A model for atomic structure is proposed which includes both sp2 and sp3 bond configurations and direct comparisons are made with data obtained from sputtered carbon films, graphite and diamond.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 90: Symposium R – Materials for Infrared Detectors and Sources , 1986 , 133
Copyright
Copyright © Materials Research Society 1987

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References

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