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Atomic-scale diffusion rates during growth of thin metal films on weakly-interacting substrates
Linköping University, Department of Physics, Chemistry and Biology, Nanoscale engineering. Linköping University, Faculty of Science & Engineering. Univ Poitiers, France.ORCID iD: 0000-0003-2765-2271
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Ruhr Univ Bochum, Germany.ORCID iD: 0000-0002-1379-6656
Univ Poitiers, France.
Linköping University, Department of Physics, Chemistry and Biology, Nanoscale engineering. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-2864-9509
2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 6640Article in journal (Refereed) Published
Abstract [en]

We use a combined experimental and theoretical approach to study the rates of surface diffusion processes that govern early stages of thin Ag and Cu film morphological evolution on weakly-interacting amorphous carbon substrates. Films are deposited by magnetron sputtering, at temperatures T-S between 298 and 413 K, and vapor arrival rates F in the range 0.08 to 5.38 monolayers/s. By employing in situ and real-time sheet-resistance and wafer-curvature measurements, we determine the nominal film thickness Theta at percolation (Theta(perc)) and continuous film formation (Theta(cont)) transition. Subsequently, we use the scaling behavior of Theta(perc) and Theta(cont) as a function of F and T-s, to estimate, experimentally, the temperature-dependent diffusivity on the substrate surface, from which we calculate Ag and Cu surface migration energy barriers E-D(exp) and attempt frequencies nu(exp)(0). By critically comparing E-D(exp) and nu(exp)(0) with literature data, as well as with results from our ab initio molecular dynamics simulations for single Ag and Cu adatom diffusion on graphite surfaces, we suggest that: (i) E-D(exp) and nu(exp)(0) correspond to diffusion of multiatomic clusters, rather than to diffusion of monomers; and (ii) the mean size of mobile clusters during Ag growth is larger compared to that of Cu. The overall results of this work pave the way for studying growth dynamics in a wide range of technologically-relevant weakly-interacting film/substrate systems-including metals on 2D materials and oxides-which are building blocks in next-generation nanoelectronic, optoelectronic, and catalytic devices.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019. Vol. 9, article id 6640
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-158369DOI: 10.1038/s41598-019-43107-8ISI: 000466127100065PubMedID: 31036908Scopus ID: 2-s2.0-85065068804OAI: oai:DiVA.org:liu-158369DiVA, id: diva2:1333826
Note

Funding Agencies|French Government program "Investissements dAvenir" (LABEX INTERACTIFS) [ANR-11-LABX-0017-01]; Linkoping University ("LiU Career Contract") [Dnr-LiU-2015-01510]; Swedish research council [VR-2015-04630]; Olle Engkvist foundation [SOEB 190-312]; Olle Engkvist Foundation

Available from: 2019-07-02 Created: 2019-07-02 Last updated: 2019-11-05Bibliographically approved

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