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The effect of the microstructure and the surface topography on the electrical properties of thin Ag films deposited by high power pulsed magnetron sputtering
Institute of Physics (IA), RWTH Aachen University, Germany.ORCID iD: 0000-0003-2864-9509
University of Aachen, Germany.
University of Aachen, Germany.
University of Aachen, Germany.
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2008 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 202, no 11, 2323-2327 p.Article in journal (Refereed) Published
Abstract [en]

In this work thin silver (Ag) films are grown employing high power pulsed magnetron sputtering (HPPMS) for various pulse on/off time configurations, as well as by dc magnetron sputtering (dcMS), for reference. It is shown that the increase of the pulse off-time from 450 mu s to 3450 mu s, while the pulse on-time is kept constant at 50 mu s, results in an increase of the peak target current (I-Tp) from 3 A to 22 A. The increase of I-Tp is accompanied by an increase of the ion flux towards the growing film. This is particularly pronounced for I-Tp greater than 11 A. The microstructure, the surface topography and the electrical properties of Ag films grown at I-Tp = 11 A, I-Tp = 22 A and by dcMS are investigated, as a function of the film thickness d. It is shown that for d greater than 20 nin the electrical resistivity of films sputtered at I-Tp=22 A is similar to that of films grown by dcMS. Slightly higher values are measured for films grown at I-Tp = 11A. It is found that in this thickness range the film conductivity is strongly affected by the vertical grain size and the scattering of the charged carriers at the film interfaces. For d less than 15 nm the resistivity of films deposited at I-Tp = 22 A is substantially lower as compared to that of films grown by dcMS. Films deposited at I-Tp = 11 A exhibit also in this case a higher conductivity. In this thickness regime the electronic transport and, thus the conductivity are profoundly determined by the surface topography and the film density.

Place, publisher, year, edition, pages
Elsevier , 2008. Vol. 202, no 11, 2323-2327 p.
Keyword [en]
HPPMS; HiPIMS; silver films; conductivity
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-71485DOI: 10.1016/j.surfcoat.2007.08.028ISI: 000253930900020OAI: oai:DiVA.org:liu-71485DiVA: diva2:450206
Available from: 2011-10-20 Created: 2011-10-20 Last updated: 2017-12-08

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Sarakinos, Kostas

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