Formation of epitaxial oxide nanodots on oxide substrate: Cu2O on SrTiO3(1 0 0)

I. Lyubinetsky, A. S. Lea, S. Thevuthasan, D. R. Baer

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    13 Citations (Scopus)

    Abstract

    X-ray photoelectron spectroscopy analysis during the oxygen plasma assisted molecular beam epitaxy, combined with atomic force microscopy and scanning Auger microscopy have been used to evaluate the mechanism of single-phase Cu2O nanodot formation on the SrTiO3(1 0 0) surface. Formation of pure crystalline Cu2O nanodots occurs rather in a narrow growth parameter window, outside which a coexistence of the multiple phases has been observed. Cuprous oxide nanodots on the SrTiO3(1 0 0) substrate follow a growth mechanism which differs significantly from the growth modes observed for the majority of semiconductor quantum dots. Growth starts without wetting layer formation with appearance of well-ordered truncated square-based nanodots at submonolayer coverages. At the initial stages of growth, the nanodot size is only weakly changes with coverage and exponentially scales with temperature. After reaching a critical, temperature dependent dot density (∼1013 cm-2 for 760 K growth temperature), growth of mid-sized nanoclusters starts through coalescence, which is eventually followed by large dome-shaped cluster formation at higher coverages. The coexistence of the different types of the clusters at high coverages results in a multimodal distribution of sizes and shapes.

    Original languageEnglish
    Pages (from-to)120-128
    Number of pages9
    JournalSurface Science
    Volume589
    Issue number1-3
    DOIs
    Publication statusPublished - 1 Sep 2005

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    Keywords

    • Atomic force microscopy
    • Clusters
    • Copper oxides
    • Molecular beam epitaxy
    • Self-assembly
    • X-ray photoelectron spectroscopy

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

    Cite this

    Lyubinetsky, I., Lea, A. S., Thevuthasan, S., & Baer, D. R. (2005). Formation of epitaxial oxide nanodots on oxide substrate: Cu2O on SrTiO3(1 0 0). Surface Science, 589(1-3), 120-128. https://doi.org/10.1016/j.susc.2005.05.062