Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites

Tassie K. Andersen*, Seyoung Cook, Gang Wan, Hawoong Hong, Laurence Marks, Dillon D. Fong

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Control over structure and composition of (ABO3) perovskite oxides offers exciting opportunities since these materials possess unique, tunable properties. Perovskite oxides with cobalt B-site cations are particularly promising, as the range of the cation's stable oxidation states leads to many possible structural frameworks. Here, we report growth of strontium cobalt oxide thin films by molecular beam epitaxy, and conditions necessary to stabilize different defect concentration phases. In situ X-ray scattering is used to monitor structural evolution during growth, while in situ X-ray absorption near-edge spectroscopy is used to probe oxidation state and measure changes to oxygen vacancy concentration as a function of film thickness. Experimental results are compared to kinetically limited thermodynamic predictions, in particular, solute trapping, with semiquantitative agreement. Agreement between observations of dependence of cobaltite phase on oxidation activity and deposition rate, and predictions indicates that a combined experimental/theoretical approach is key to understanding phase behavior in the strontium cobalt oxide system.

Original languageEnglish (US)
Pages (from-to)5949-5958
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number6
DOIs
StatePublished - Feb 14 2018

Keywords

  • defects in oxides
  • metal oxides
  • molecular beam epitaxy
  • perovskite oxides
  • strontium cobalt oxide
  • thin films

ASJC Scopus subject areas

  • Materials Science(all)

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    Andersen, T. K., Cook, S., Wan, G., Hong, H., Marks, L., & Fong, D. D. (2018). Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites. ACS Applied Materials and Interfaces, 10(6), 5949-5958. https://doi.org/10.1021/acsami.7b16970