Pseudomorphic molecular beam epitaxy growth of {gamma}-Al{sub 2}O{sub 3}(001) on Si(001) and evidence for spontaneous lattice reorientation during epitaxy
- STMicroelectronics, 850 rue Jean Monnet, 38926 Crolles Cedex (France)
Single crystal {gamma}-Al{sub 2}O{sub 3} thin films have been epitaxially grown by molecular beam epitaxy at 850 deg. C on Si(001) substrates. Reflection high energy electron diffraction and transmission electron microscopy experiments evidence the good crystalline quality of the Al{sub 2}O{sub 3} layer. The present study shows that the two first monolayers of {gamma}-Al{sub 2}O{sub 3} are (001) oriented and coherently strained on Si. For larger thickness, a transition from (001)- to (111)-oriented Al{sub 2}O{sub 3} occurs, together with the apparition of domains in the layer. In-plane epitaxial relationship between Al{sub 2}O{sub 3} and Si(001) are deduced from these observations.
- OSTI ID:
- 20880132
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 23 Vol. 89; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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