Nucleation of Ge quantum dots on the Si(001) surface

Physical Review B - Condensed Matter and Materials Physics

Volumn 82, Issue 4, 2010, Pages

  Arapkina, Larisa V ^a   Yuryev, Vladimir A ^a  

^a PROKHOROV GENERAL PHYSICS INSTITUTE   (Russian Federation)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 77956710114     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.82.045315     Document Type: Article

References (32)

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15. Kästner and Voigtländer observed a similar phenomenon-the growth of Ge coverage caused the increase in elongated huts density (Ref.).
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17. A modified terminology was specially introduced by us in Ref. to emphasize that the difference between the clusters is not only in the shapes but primarily in their atomic structures. The wedgelike cluster may be short and nearly square based but its atomic structure remains the structure of the wedge and not that of the pyramid (Refs.). The term "elongated" implies elongation of some precursor. Usually the "square-based" clusters (the pyramids) are considered as such precursors. This assumption turned out to be wrong (Ref.). Note also that according to Ref. transformation of a wedgelike hut cluster to a dome cluster is impossible too.
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24. It might seem that we studied nucleation of so-called "prepyramids" (Ref.) (or "prehuts"). We tried to observe the prehuts carefully exploring arrays with h Ge from 3 to 14 Å but we failed. The clusters always had their specific structure (Ref.) which was independent of the width-to-height ratio and arose when the cluster second layer formed.
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30. The same structure is observed on top of a mature pyramid shown in Fig..
31. A complete set of ridge configurations arising during the wedge height growth can be easily obtained when drawing schematic plots of a growing wedge by serial-layer by layer from bottom to top-completion of its terraces.
32. Of course, the triangular facets also grow by the same number of layers as trapezoidal ones in the process of the in-height growth of a wedge, otherwise the whole crystalline structure of the cluster would be disturbed. As distinct from the in-height growth, rapid growth of the triangular facets, which is responsible for cluster elongation, does not cause the growth of the trapezoidal facets.