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Dynamics of 3D-island growth on weakly-interacting substrates
Linköping University, Department of Physics, Chemistry and Biology, Nanoscale engineering. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Nanoscale engineering. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-2541-2867
Linköping University, Department of Physics, Chemistry and Biology, Nanoscale engineering. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. Univ Illinois, IL 61801 USA.
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2019 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 488, p. 383-390Article in journal (Refereed) Published
Abstract [en]

The growth dynamics of faceted three-dimensional (3D) Ag islands on weakly-interacting substrates are investigated-using kinetic Monte Carlo (kMC) simulations and analytical modelling-with the objective of determining the critical top-layer radius R-c required to nucleate a new island layer as a function of temperature T, at a constant deposition rate. kMC shows that R-c decreases from 17.3 to 6.0 angstrom as T is increased at 25 K intervals, from 300 to 500 K. That is, a higher T promotes top-layer nucleation resulting in an increase in island height-to-radius aspect ratios. This explains experimental observations for film growth on weakly-interacting substrates, which are not consistent with classical homoepitaxial growth theory. In the latter case, higher temperatures yield lower top-layer nucleation rates and lead to a decrease in island aspect ratios. The kMC simulation results are corroborated by an analytical mean field model, in which R-c is estimated by calculating the steady-state adatom density on the island side facets and top layer as a function of T. The overall findings of this study constitute a first step toward developing rigorous theoretical models, which can be used to guide synthesis of metal nanostructures, and layers with controlled shape and morphology, on technologically important substrates, including two-dimensional crystals, for nanoelectronic and catalytic applications.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 488, p. 383-390
Keywords [en]
Growth; Kinetic Monte Carlo; Nanostructure; Diffusion; Nucleation
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-158910DOI: 10.1016/j.apsusc.2019.05.208ISI: 000472476200042OAI: oai:DiVA.org:liu-158910DiVA, id: diva2:1338213
Note

Funding Agencies|Linkoping University ("LiU Career Contract") [Dnr-LiU-2015-01510]; Swedish Research Council [VR-2015-04630, VR2014-5790]; Knut and Alice Wallenberg Foundation [KAW 2011-0094]

Available from: 2019-07-20 Created: 2019-07-20 Last updated: 2019-07-20

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Gervilla Palomar, VictorAlmyras, GeorgiosThunstrom, F.Greene, Joseph ESarakinos, Kostas
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