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 (US) |
|---|---|
| Article number | 205302 |
| Journal | Journal of Applied Physics |
| Volume | 124 |
| Issue number | 20 |
| DOIs | |
| State | Published - Nov 28 2018 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Complexities of atomic structure at CdO/MgO and CdO/Al 2 O 3 interfaces. / Grimley, Everett D.; Wynn, Alex P.; Kelley, Kyle P.; Sachet, Edward; Dean, Julian S.; Freeman, Colin L.; Maria, Jon-Paul; Lebeau, James M.
In: Journal of Applied Physics, Vol. 124, No. 20, 205302, 28.11.2018.Research output: Contribution to journal › Article
TY - JOUR
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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U2 - 10.1063/1.5053752
DO - 10.1063/1.5053752
M3 - Article
VL - 124
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 20
M1 - 205302
ER -