Journal
DIAMOND AND RELATED MATERIALS
Volume 14, Issue 3-7, Pages 994-999Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2004.12.028
Keywords
diamond like carbon; hydrogenated amorphous carbon; PECVD; protective coatings; characterisation
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Diamond-like carbon (DLC) is a promising protective coating for future optical storage technologies. The requirements place conflicting constraints on the nature of the DLC. It must be transparent at 400 nm, hard and wear-resistant, uniform, pinhole-free, have a low stress and be deposited at high rate without a high heat load on a plastic substrate. In order to optimise the films under these constraints, we have studied in detail the band gap, stress, density and Young's modulus of hydrogenated amorphous carbon (a-C:H) films deposited by plasma enhanced chemical vapour deposition using a large area electron cyclotron wave resonance source of 14 in. diameter and a variety of hydrocarbon gas sources. We have been able to produce wear-resistant carbon coatings with a high transparency at 400 nm without damaging the plastic disks. We also show that for these films the refractive index can be used as a rapid empirical means of property correlation. (c) 2004 Elsevier B.V. All rights reserved.
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