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Correlative Experimental and Theoretical Investigation of the Angle-Resolved Composition Evolution of Thin Films Sputtered from a Compound Mo2BC Targe
Rhein Westfal TH Aachen, Mat Chem, Aachen, Germany.
Rhein Westfal TH Aachen, Mat Chem, Aachen, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.ORCID iD: 0000-0002-5815-3742
Rhein Westfal TH Aachen, Mat Chem, Aachen, Germany.
2019 (English)In: Coatings, ISSN 2079-6412, Vol. 9, no 3, article id 206Article in journal (Refereed) Published
Abstract [en]

The angle-resolved composition evolution of Mo-B-C thin films deposited from a Mo2BC compound target was investigated experimentally and theoretically. Depositions were carried out by direct current magnetron sputtering (DCMS) in a pressure range from 0.09 to 0.98 Pa in Ar and Kr. The substrates were placed at specific angles α with respect to the target normal from 0 to ±67.5°. A model based on TRIDYN and SIMTRA was used to calculate the influence of the sputtering gas on the angular distribution function of the sputtered species at the target, their transport through the gas phase, and film composition. Experimental pressure- and sputtering gas-dependent thin film chemical composition data are in good agreement with simulated angle-resolved film composition data. In Ar, the pressure-induced film composition variations at a particular α are within the error of the EDX measurements. On the contrary, an order of magnitude increase in Kr pressure results in an increase of the Mo concentration measured at α = 0° from 36 at.% to 43 at.%. It is shown that the mass ratio between sputtering gas and sputtered species defines the scattering angle within the collision cascades in the target, as well as for the collisions in the gas phase, which in turn defines the angle- and pressure-dependent film compositions.

Place, publisher, year, edition, pages
2019. Vol. 9, no 3, article id 206
Keywords [en]
physical vapor deposition, Mo2BC, Monte Carlo simulation, scattering, density functional theory
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Identifiers
URN: urn:nbn:se:uu:diva-382658DOI: 10.3390/coatings9030206ISI: 000464281200002OAI: oai:DiVA.org:uu-382658DiVA, id: diva2:1313980
Funder
German Research Foundation (DFG), SCHN 735/35-1Available from: 2019-05-07 Created: 2019-05-07 Last updated: 2019-05-07Bibliographically approved

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