Multi-scale ordering of self-assembled InAs/GaAs(001) quantum dots

Ordering phenomena related to the self-assembly of InAs quantum dots (QD) grown on GaAs(001) substrates are experimentally investigated on different length scales. On the shortest length-scale studied here, we examine the QD morphology and observe two types of QD shapes, i.e., pyramids and domes. Py...

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Main Authors:	Kiravittaya, S, Songmuang, R, Rastelli, A, Heidemeyer, H, Schmidt, OG
Format:	Online
Language:	English
Published:	Springer 2006
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3246629/

id	pubmed-3246629
recordtype	oai_dc
spelling	pubmed-32466292011-12-28 Multi-scale ordering of self-assembled InAs/GaAs(001) quantum dots Kiravittaya, S Songmuang, R Rastelli, A Heidemeyer, H Schmidt, OG Nano Review Ordering phenomena related to the self-assembly of InAs quantum dots (QD) grown on GaAs(001) substrates are experimentally investigated on different length scales. On the shortest length-scale studied here, we examine the QD morphology and observe two types of QD shapes, i.e., pyramids and domes. Pyramids are elongated along the [1-10] directions and are bounded by {137} facets, while domes have a multi-facetted shape. By changing the growth rates, we are able to control the size and size homogeneity of freestanding QDs. QDs grown by using low growth rate are characterized by larger sizes and a narrower size distribution. The homogeneity of buried QDs is measured by photoluminescence spectroscopy and can be improved by low temperature overgrowth. The overgrowth induces the formation of nanostructures on the surface. The fabrication of self-assembled nanoholes, which are used as a template to induce short-range positioning of QDs, is also investigated. The growth of closely spaced QDs (QD molecules) containing 2–6 QDs per QD molecule is discussed. Finally, the long-range positioning of self-assembled QDs, which can be achieved by the growth on patterned substrates, is demonstrated. Lateral QD replication observed during growth of three-dimensional QD crystals is reported. Springer 2006-07-25 /pmc/articles/PMC3246629/ http://dx.doi.org/10.1007/s11671-006-9014-8 Text en Copyright ©2006 to the authors
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Kiravittaya, S Songmuang, R Rastelli, A Heidemeyer, H Schmidt, OG
spellingShingle	Kiravittaya, S Songmuang, R Rastelli, A Heidemeyer, H Schmidt, OG Multi-scale ordering of self-assembled InAs/GaAs(001) quantum dots
author_facet	Kiravittaya, S Songmuang, R Rastelli, A Heidemeyer, H Schmidt, OG
author_sort	Kiravittaya, S
title	Multi-scale ordering of self-assembled InAs/GaAs(001) quantum dots
title_short	Multi-scale ordering of self-assembled InAs/GaAs(001) quantum dots
title_full	Multi-scale ordering of self-assembled InAs/GaAs(001) quantum dots
title_fullStr	Multi-scale ordering of self-assembled InAs/GaAs(001) quantum dots
title_full_unstemmed	Multi-scale ordering of self-assembled InAs/GaAs(001) quantum dots
title_sort	multi-scale ordering of self-assembled inas/gaas(001) quantum dots
description	Ordering phenomena related to the self-assembly of InAs quantum dots (QD) grown on GaAs(001) substrates are experimentally investigated on different length scales. On the shortest length-scale studied here, we examine the QD morphology and observe two types of QD shapes, i.e., pyramids and domes. Pyramids are elongated along the [1-10] directions and are bounded by {137} facets, while domes have a multi-facetted shape. By changing the growth rates, we are able to control the size and size homogeneity of freestanding QDs. QDs grown by using low growth rate are characterized by larger sizes and a narrower size distribution. The homogeneity of buried QDs is measured by photoluminescence spectroscopy and can be improved by low temperature overgrowth. The overgrowth induces the formation of nanostructures on the surface. The fabrication of self-assembled nanoholes, which are used as a template to induce short-range positioning of QDs, is also investigated. The growth of closely spaced QDs (QD molecules) containing 2–6 QDs per QD molecule is discussed. Finally, the long-range positioning of self-assembled QDs, which can be achieved by the growth on patterned substrates, is demonstrated. Lateral QD replication observed during growth of three-dimensional QD crystals is reported.
publisher	Springer
publishDate	2006
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3246629/
_version_	1611496681363210240

Multi-scale ordering of self-assembled InAs/GaAs(001) quantum dots

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