Characterization of an unbalanced magnetron for composite film (metal/C : H) deposition

Abstract In this paper, plasma parameters of a DC unbalanced planar magnetron applied for Mo/C : H composite film deposition are described in connection with the basic film properties. Langmuir probe (of a V shape) heated to a dark red was used for V – A characteristic measurements in Ar and in a mixture of Ar and n-hexane as working gases. Floating and plasma potentials, electron temperature and concentrations were measured. Using a cold plane Langmuir electrostatic probe in the form of a small disc the radial distribution of a plasma potential and saturated ion current to the probe were determined. Using a thermocouple probe spot welded to the disc probe a heat load in the substrate plane was investigated. Also the dependence of the floating potential on pressure of the working gas and substrate temperature on the power delivered to the discharge were found. Finally, radial distribution of the composite film resistance per square and film thickness were measured and are discussed in connection with the measured plasma parameters.