Real time observation of ultrathin epitaxial oxide growth during alloy oxidation
(2007) In New Journal of Physics 9. p.331-331- Abstract
- We have studied the thermal oxidation of the intermetallic alloy CoGa in situ, in real time on the atomic scale, during the growth of an ultrathin, epitaxial Ga oxide layer. On the basis of an extended set of surface x-ray diffraction data, density functional theory calculations and core level spectroscopy data, we find that the oxide film consists of an oxygen ion double layer, which contains the basic building block of bulk beta- Ga2O3. The oxide formation takes place via the nucleation of two- dimensional, anisotropic oxide islands which laterally grow and coalesce. A dramatic increase of the oxide island size is observed for low O-2 pressures in the 10(-8) mbar regime, which we interpret as the onset of a step flow like growth mode.... (More)
- We have studied the thermal oxidation of the intermetallic alloy CoGa in situ, in real time on the atomic scale, during the growth of an ultrathin, epitaxial Ga oxide layer. On the basis of an extended set of surface x-ray diffraction data, density functional theory calculations and core level spectroscopy data, we find that the oxide film consists of an oxygen ion double layer, which contains the basic building block of bulk beta- Ga2O3. The oxide formation takes place via the nucleation of two- dimensional, anisotropic oxide islands which laterally grow and coalesce. A dramatic increase of the oxide island size is observed for low O-2 pressures in the 10(-8) mbar regime, which we interpret as the onset of a step flow like growth mode. This allows us to conclude that thermal oxidation can be considered as a hetero- epitaxial growth process, that follows similar atomistic growth principles to molecular beam epitaxy. As a consequence, the structural perfection of the oxide layer can be tailored by the appropriate choice of oxygen pressure and temperature. (Less)
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https://lup.lub.lu.se/record/764764
- author
- organization
- publishing date
- 2007
- type
- Contribution to journal
- publication status
- published
- subject
- in
- New Journal of Physics
- volume
- 9
- pages
- 331 - 331
- publisher
- IOP Publishing
- external identifiers
-
- wos:000249702700002
- scopus:34748895435
- ISSN
- 1367-2630
- DOI
- 10.1088/1367-2630/9/9/331
- language
- English
- LU publication?
- yes
- id
- 572a4c19-8ec9-44f1-8647-25d2d2c83560 (old id 764764)
- date added to LUP
- 2016-04-04 12:59:50
- date last changed
- 2022-03-23 19:19:51
@article{572a4c19-8ec9-44f1-8647-25d2d2c83560,
abstract = {{We have studied the thermal oxidation of the intermetallic alloy CoGa in situ, in real time on the atomic scale, during the growth of an ultrathin, epitaxial Ga oxide layer. On the basis of an extended set of surface x-ray diffraction data, density functional theory calculations and core level spectroscopy data, we find that the oxide film consists of an oxygen ion double layer, which contains the basic building block of bulk beta- Ga2O3. The oxide formation takes place via the nucleation of two- dimensional, anisotropic oxide islands which laterally grow and coalesce. A dramatic increase of the oxide island size is observed for low O-2 pressures in the 10(-8) mbar regime, which we interpret as the onset of a step flow like growth mode. This allows us to conclude that thermal oxidation can be considered as a hetero- epitaxial growth process, that follows similar atomistic growth principles to molecular beam epitaxy. As a consequence, the structural perfection of the oxide layer can be tailored by the appropriate choice of oxygen pressure and temperature.}},
author = {{Stierle, A. and Streitel, R. and Nolte, P. and Vlad, A. and Costina, I. and Marsman, M. and Kresse, G. and Lundgren, Edvin and Andersen, Jesper N and Franchy, R. and Dosch, H.}},
issn = {{1367-2630}},
language = {{eng}},
pages = {{331--331}},
publisher = {{IOP Publishing}},
series = {{New Journal of Physics}},
title = {{Real time observation of ultrathin epitaxial oxide growth during alloy oxidation}},
url = {{http://dx.doi.org/10.1088/1367-2630/9/9/331}},
doi = {{10.1088/1367-2630/9/9/331}},
volume = {{9}},
year = {{2007}},
}