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Lateral and Vertical Ordering of PbSe Self-Assembled Quantum Dots in PbSe/PbEuTe Superlattices

Published online by Cambridge University Press:  10 February 2011

V. Holý ,
J. Stangl ,
G. Springholz ,
M. Pinczolits  and
G. Bauer
V. Holý
Affiliation:
Dept. Solid State Phys., Masaryk University, 61137 Brno, Czech Republic, [email protected]
J. Stangl
Affiliation:
Inst. of Semiconductor Physics, Kepler University, A-4040 Linz, Austria
G. Springholz
Affiliation:
Inst. of Semiconductor Physics, Kepler University, A-4040 Linz, Austria
M. Pinczolits
Affiliation:
Inst. of Semiconductor Physics, Kepler University, A-4040 Linz, Austria
G. Bauer
Affiliation:
Inst. of Semiconductor Physics, Kepler University, A-4040 Linz, Austria
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Abstract

The shape and the positions of self-organized PbSe quantum dots embedded in PbEuTe are studied by means of grazing-incidence small angle x-ray scattering and x-ray diffraction. Using a detailed numerical analysis of the measured x-ray data, we have determined a truncated pyramidal shape of the free-standing dots. The type of the lateral dot ordering depends substantially on the period of the PbSe/PbEuTe superlattice. In the case of smaller periods, the lateral ordering of the dots obeys a short-range order model and we have determined the statistical properties of the dot arrangement. For intermediate spacer thicknesses the dots form a hexagonal lattice. For larger periods, the dots are completely uncorrelated and their distribution can be described as a two-dimensional ideal gas. From coplanar x-ray diffraction we have determined additionally the vertical correlation of the dot positions changes from a mere vertical correlation for small superlattice periods, to a distorted trigonal lattice for the intermediate periods. For the largest period, no vertical correlation of dot positions is observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 618: Symposium K – Morphological & Compositional Evolution of Heteroepitaxial… , 2000 , 161
Copyright
Copyright © Materials Research Society 2000

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References

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