Complexities of atomic structure at CdO/MgO and CdO/Al 2 O 3 interfaces

Everett D. Grimley; Alex P. Wynn; Kyle P. Kelley; Edward Sachet; Julian S. Dean; Colin L. Freeman; Jon Paul Maria; James M. Lebeau

doi:10.1063/1.5053752

Complexities of atomic structure at CdO/MgO and CdO/Al 2 O 3 interfaces

Everett D. Grimley, Alex P. Wynn, Kyle P. Kelley, Edward Sachet, Julian S. Dean, Colin L. Freeman, Jon Paul Maria, James M. Lebeau

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We report the interface structures of CdO thin films on 001-MgO and 0001-Al 2O 3 substrates. Using aberration corrected scanning transmission electron microscopy, we show that epitaxial growth of (001)-CdO ∥(001)-MgO occurs with a lattice misfit greater than 10%. A high density of interface misfit dislocations is found to form. In combination with molecular dynamics simulations, we show that dislocation strain fields form and overlap in very thin heterostructures of CdO and MgO (<3 nm). On the c-Al 2O 3 substrate, we find that CdO grows with a surface normal of 025. We show that three rotation variants form due to the symmetry of the sapphire surface. These results contribute insights into the epitaxial growth of these rock-salt oxides.

Original language	English
Article number	205302
Journal	Journal of Applied Physics
Volume	124
Issue number	20
DOIs	https://doi.org/10.1063/1.5053752
State	Published - Nov 28 2018
Externally published	Yes

Funding

E.D.G. and J.M.L. gratefully acknowledge support from the National Science Foundation (Award No. DMR-1350273). E.D.G. acknowledges support for this work through a National Science Foundation Graduate Research Fellowship (Grant No. DGE-1252376). A.P.W., C.L.F., and J.S.D. would like to thank funding from EPSRC Grant Nos. EP/L017563/1 and EP/P015561/1. J.P.M., E.S., and K.P.K. acknowledge funding from NSF CHE-1507947 and ARO W911NF-16-1-0406. This work was performed in part at the Analytical Instrumentation Facility (AIF) at North Carolina State University, which is supported by the State of North Carolina and the National Science Foundation (Award No. ECCS-1542015). The AIF is a member of the North Carolina Research Triangle Nanotechnology Network (RTNN), a site in the National Nanotechnology Coordinated Infrastructure (NNCI).

Funders	Funder number
National Science Foundation	CHE-1507947
Army Research Office	W911NF-16-1-0406
North Carolina State University
Engineering and Physical Sciences Research Council	EP/L017563/1, EP/P015561/1
Norsk Sykepleierforbund
National Science Foundation	ECCS-1542015, DMR-1350273

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title = "Complexities of atomic structure at CdO/MgO and CdO/Al 2 O 3 interfaces",

abstract = "We report the interface structures of CdO thin films on 001-MgO and 0001-Al 2O 3 substrates. Using aberration corrected scanning transmission electron microscopy, we show that epitaxial growth of (001)-CdO ∥(001)-MgO occurs with a lattice misfit greater than 10%. A high density of interface misfit dislocations is found to form. In combination with molecular dynamics simulations, we show that dislocation strain fields form and overlap in very thin heterostructures of CdO and MgO (<3 nm). On the c-Al 2O 3 substrate, we find that CdO grows with a surface normal of 025. We show that three rotation variants form due to the symmetry of the sapphire surface. These results contribute insights into the epitaxial growth of these rock-salt oxides.",

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doi = "10.1063/1.5053752",

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T1 - Complexities of atomic structure at CdO/MgO and CdO/Al 2 O 3 interfaces

AU - Grimley, Everett D.

AU - Wynn, Alex P.

AU - Kelley, Kyle P.

AU - Sachet, Edward

AU - Dean, Julian S.

AU - Freeman, Colin L.

AU - Maria, Jon Paul

AU - Lebeau, James M.

PY - 2018/11/28

Y1 - 2018/11/28

N2 - We report the interface structures of CdO thin films on 001-MgO and 0001-Al 2O 3 substrates. Using aberration corrected scanning transmission electron microscopy, we show that epitaxial growth of (001)-CdO ∥(001)-MgO occurs with a lattice misfit greater than 10%. A high density of interface misfit dislocations is found to form. In combination with molecular dynamics simulations, we show that dislocation strain fields form and overlap in very thin heterostructures of CdO and MgO (<3 nm). On the c-Al 2O 3 substrate, we find that CdO grows with a surface normal of 025. We show that three rotation variants form due to the symmetry of the sapphire surface. These results contribute insights into the epitaxial growth of these rock-salt oxides.

AB - We report the interface structures of CdO thin films on 001-MgO and 0001-Al 2O 3 substrates. Using aberration corrected scanning transmission electron microscopy, we show that epitaxial growth of (001)-CdO ∥(001)-MgO occurs with a lattice misfit greater than 10%. A high density of interface misfit dislocations is found to form. In combination with molecular dynamics simulations, we show that dislocation strain fields form and overlap in very thin heterostructures of CdO and MgO (<3 nm). On the c-Al 2O 3 substrate, we find that CdO grows with a surface normal of 025. We show that three rotation variants form due to the symmetry of the sapphire surface. These results contribute insights into the epitaxial growth of these rock-salt oxides.

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Complexities of atomic structure at CdO/MgO and CdO/Al 2 O 3 interfaces

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