Nucleation and core-shell formation mechanism of self-induced InxAl1−xN core-shell nanorods grown on sapphire substrates by magnetron sputter epitaxy
2016 (English)In: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 131, 39-43 p.Article in journal (Refereed) Published
Nucleation of self-induced nanorod and core-shell structure formation by surface-induced phase separation have been studied at the initial growth stage. The growth of well-separated core shell nanorods is only found in a transition temperature region (600 degrees C amp;lt;= T amp;lt;= 800 degrees C) in contrast to the result of thin film growth outside this region (T amp;lt; 600 degrees C or T amp;gt; 800 degrees C). Formation of multiple compositional domains, due to phase separation, after similar to 20 nm InxAl1-xN epilayer growth from sapphire substrate promotes the core-shell nanorod growth, showing a modified Stranski-Krastanov growth mode. The use of VN seed layer makes the initial growth of the nanorods directly at the substrate interface, revealing a Volmer-Weber growth mode. Different compositional domains are found on VN template surface to support that the phase separation takes place at the initial nucleation process and forms by a self-patterning effect. The nanorods were grown from In-rich domains and initiated the formation of core-shell nanorods due to spinodal decomposition of the InxAl1-xN alloy with a composition in the miscibility gap.
Place, publisher, year, edition, pages
Pergamon Press, 2016. Vol. 131, 39-43 p.
InAlN; Nanorods, Nanostructures, STEM; EDX, Sputtering, MSE
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-131902DOI: 10.1016/j.vacuum.2016.05.022ISI: 000381541400007OAI: oai:DiVA.org:liu-131902DiVA: diva2:1034871
Funding Agencies|Swedish Research Council (VR) [621-2012-4420]; Swedish Governmental Agency for Innovation Systems (VINNOVA) under the VINNMER international qualification program; Knut and Alice Wallenberg Foundation2016-10-132016-10-112016-10-20Bibliographically approved