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Atomic Force Microscopy and Transmission Electron Microscopy Study of Self-Organized Ordering in Vertically Aligned PbSe Quantum Dot Superlattices

Published online by Cambridge University Press:  17 March 2011

A. Raab ,
G. Springholz ,
R. T. Lechner ,
I. Vavra ,
H. H. Kang  and
L. Salamanca-Riba
A. Raab
Affiliation:
Institut für Halbleiterphysik, Johannes Kepler Universität, A-4040 Linz, Austria
G. Springholz
Affiliation:
Institut für Halbleiterphysik, Johannes Kepler Universität, A-4040 Linz, Austria
R. T. Lechner
Affiliation:
Institut für Halbleiterphysik, Johannes Kepler Universität, A-4040 Linz, Austria
I. Vavra
Affiliation:
Institute of Electrical Engineering, Slovak Academy of Sciences, Bratislava, Slovakia
H. H. Kang
Affiliation:
Department of Materials and Nuclear Engineering, University of Maryland, College Park, USA
L. Salamanca-Riba
Affiliation:
Department of Materials and Nuclear Engineering, University of Maryland, College Park, USA
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Abstract

Self-organized lateral ordering is studied for PbSe/Pb1- x Eux Te quantum dot superlattices as a function of spacer thickness using atomic force microscopy and transmission electron microscopy. It is found that a pronounced hexagonal lateral ordering tendency exist not only for fcc-stacked superlattices but also for those with vertical dot alignment. For the latter case, a best in-plane ordering is observed for Pb1- x Eux Te spacer thicknesses around 160 Å. This is accompanied by a pronounced narrowing of the size distribution to values as low as ±8%. The resulting in-plane dot separations and dot densities are tunable by changes in spacer thickness. Similar marked changes are also found for PbSe dot shape as well as the dot sizes. This provides additional means for the tuning of the optical and electronic properties of the dots.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 696: Symposium N – Current Issues in Heteroepitaxial Growth--Stress Relaxation and Self Assembly , 2001 , N7.2
Copyright
Copyright © Materials Research Society 2002

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