Nanoscale self-templating for oxide epitaxy with large symmetry mismatch

Direct observations using scanning transmission electron microscopy unveil an intriguing interfacial bi-layer that enables epitaxial growth of a strain-free, monoclinic, bronze-phase VO 2 (B) thin film on a perovskite SrTiO 3 (STO) substrate. We observe an ultrathin (2–3 unit cells) interlayer best...

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Published inScientific reports Vol. 6; no. 1; p. 38168
Main Authors Gao, Xiang, Lee, Shinbuhm, Nichols, John, Meyer, Tricia L., Ward, Thomas Z., Chisholm, Matthew F., Lee, Ho Nyung
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 02.12.2016
Nature Publishing Group
Subjects
639/301/299/891
639/925/357/537
Batteries
Electron microscopy
Humanities and Social Sciences
MATERIALS SCIENCE
multidisciplinary
Science
Structural properties
Transmission electron microscopy
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Summary:Direct observations using scanning transmission electron microscopy unveil an intriguing interfacial bi-layer that enables epitaxial growth of a strain-free, monoclinic, bronze-phase VO 2 (B) thin film on a perovskite SrTiO 3 (STO) substrate. We observe an ultrathin (2–3 unit cells) interlayer best described as highly strained VO 2 (B) nanodomains combined with an extra (Ti,V)O 2 layer on the TiO 2 terminated STO (001) surface. By forming a fully coherent interface with the STO substrate and a semi-coherent interface with the strain-free epitaxial VO 2 (B) film above, the interfacial bi-layer enables the epitaxial connection of the two materials despite their large symmetry and lattice mismatch.
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USDOE Office of Science (SC), Basic Energy Sciences (BES)
AC05-00OR22725
ISSN:2045-2322
2045-2322
DOI:10.1038/srep38168