Asymmetric correlation function describing the positional ordering of liquid-phase-epitaxy Si-Ge nanoscale islands

Journal Article · Tue Mar 15 00:00:00 EST 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.71.115323· OSTI ID:20666255

Schmidbauer, M; Hanke, M; Koehler, R ^[1]

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1. Institut fuer Physik, Humboldt-Universitaet zu Berlin, Newtonstrasse 15, 12489 Berlin (Germany)

Liquid-phase-epitaxy grown SiGe nanoscale islands on (001)Si form extended chains which are aligned along the <100> directions. The positional ordering within the island chains was studied by x-ray diffuse scattering. The results can be interpreted by a short-range order model. The corresponding correlation function exhibits an asymmetric peak profile. The asymmetry leads to nonequidistantly spaced satellite peaks that disperse outward slightly with increasing lateral momentum transfer. The observed asymmetric island-island correlation is caused by the successive growth of the islands within a chain, while the new island position is influenced by depletion of the wetting layer around the island.

• OSTI ID: 20666255
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 71, Issue 11; Other Information: DOI: 10.1103/PhysRevB.71.115323; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ASYMMETRY
CORRELATION FUNCTIONS
DIFFUSE SCATTERING
GERMANIUM ALLOYS
LAYERS
LIQUID PHASE EPITAXY
MOMENTUM TRANSFER
NANOSTRUCTURES
SEMICONDUCTOR MATERIALS
SILICON ALLOYS
X-RAY DIFFRACTION