Daniel Franta, Lenka Zajíčková, Monika Karásková, Ondřej Jašek, David Nečas, Petr Klapetek, Miroslav Valtr

Optical characterization of ultrananocrystalline diamond films

Diamond and Related Materials 17 (2008) 1278–1282

Optical properties of the ultrananocrystalline diamond films were studied by multisample method based on the combination of variable angle spectroscopic ellipsometry and spectroscopic reflectometry applied in the range 0.6-6.5 eV. The films were deposited by PECVD in a conventional bell jar (ASTeX type) reactor using dual frequency discharge, microwave cavity plasma and radio frequency plasma inducing dc self-bias at a substrate holder. The optical model of the samples included a surface roughness described by the Rayleigh-Rice theory and a refractive index profile in which Drude approximation was used. The results conformed with the present understanding of the polycrystalline diamond growth on the silicon substrate because the existence of silicon carbide and amorphous hydrogenated carbon film between the silicon substrate and nucleation layer was proved.

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