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Formation of alkaline-earth template layers on Ge(100) for oxide heteroepitaxy: Self-organization of ordered islands and trenches.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . Aug2011, Vol. 84 Issue 7, p75330:1-75330:9. 9p. - Publication Year :
- 2011
-
Abstract
- The first step required for oxide heteroepitaxy with atomically abrupt interfaces on Si and Ge(100) is the formation of an alkaline-earth template layer. The atomic structure of this template layer on Ge(100) was characterized using scanning tunneling microscopy and electron diffraction. At elevated temperatures, Sr immediately roughens the surface; a transition that can be associated with Sr displacing Ge from the surface. With increasing Sr coverage a series of ordered (3 × 4), (3 × 2), (9 × 1), and (6 × 1) phases were observed. Transitions between these phases were accompanied by morphological changes: formation of the (3 × 4) phase smoothed surface; transition to a local (3 × 2) ordering was accompanied by trench formation; ordering of the trenches led to the (9 × 1) structure; and finally, the (6 × 1) structure was characterized by atomic rows. For both Sr and Ba, highly ordered arrays of one-dimensional islands could be produced with double-height steps preventing orthogonal domain formation. We associate the morphological transitions with strain relief of the surface phases and interactions of step ledges. [ABSTRACT FROM AUTHOR]
- Subjects :
- *OXIDES
*ATOMIC structure
*ATOMIC theory
*ELECTRON diffraction
*QUANTUM theory
Subjects
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 84
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 66870990
- Full Text :
- https://doi.org/10.1103/PhysRevB.84.075330