NDLI: Study of dislocation-ordered in(x)ga(1-x)as/gaas quantum dots

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Study of dislocation-ordered in(x)ga(1-x)as/gaas quantum dots

Content Provider	NASA Technical Reports Server (NTRS)
Author	Leon, Rose
Copyright Year	2003
Description	A report describes an experimental study of dislocation-induced spatial ordering of quantum dots (QDs) comprising nanometer-sized In(x)Ga(1-x)As islands surrounded by GaAs. Metastable heteroepitaxial structures were grown by molecular-beam epitaxy of In(x)Ga(1-x)As onto n+ GaAs and semi-insulating GaAs substrates. Then the structures were relaxed during a post-growth annealing/self-organizing process leading to the formation of surface undulations that acted as preferential sites for the nucleation of QDs. Structural effects of annealing times and temperatures on the strain-relaxed In(x)Ga(1-x)As/GaAs and the subsequent spatial ordering of the QDs were analyzed by atomic-force microscopy and transmission electron microscopy. Continuous-wave spectral and time-resolved photoluminescence (PL) measurements were performed to study the effects, upon optical properties, of increased QD positional ordering, increased QD uniformity, and proximity of QDs to arrays of dislocations. PL spectral peaks of ordered QD structures formed on strain-relaxed In(x)Ga(1-x)As/GaAs layers were found to be narrower than those of structures not so formed and ordered. Rise and decay times of time-resolved PL were found to be lower at lower temperatures -- apparently as a consequence of decreased carrier-transport times within the barriers surrounding the QDs.
File Size	49182
Page Count	1
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20110023858
Archival Resource Key	ark:/13960/t3dz56j7x
Language	English
Publisher Date	2003-07-01
Access Restriction	Open
Subject Keyword	Composite Materials Atomic Force Microscopy Indium Gallium Arsenides Gallium Arsenides Transmission Electron Microscopy Nucleation Quantum Dots Dislocations Materials Photoluminescence Molecular Beam Epitaxy Nanotechnology Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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