Self-formation of hexagonal nanotemplates for growth of pyramidal quantum dots by metalorganic vapor phase epitaxy on patterned substrates

We demonstrate the self-formation of hexagonal nanotemplates on GaAs （111）B substrates patterned with arrays of inverted tetrahedral pyramids during metal-organic vapor phase epitaxy and its role in producing high-symmetry, site-controlled quantum dots （QDs）. By combining atomic force microscopy mea...

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Published in:Nano research 2016-11, Vol.9 (11), p.3279-3290
Main Authors: Surrente, Alessandro, Carron, Romain, Gallo, Pascal, Rudra, Alok, Dwir, Benjamin, Kapon, Eli
Format: Article
Language:English
Subjects:
Adatoms
Atomic force microscopy
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Computer simulation
Condensed Matter Physics
Curvature
Elevation
Epitaxial growth
Epitaxial layers
Epitaxy
Fluxes
Formations
Gallium arsenide
Growth conditions
Materials Science
Metalorganic chemical vapor deposition
Nanostructure
Nanotechnology
Photons
Pyramids
Quantum dots
Quantum theory
Research Article
Substrates
Symmetry
Thin films
Vapors
六边形
图形衬底
外延法
有机金属
模板
气相外延
自形成
量子点
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description We demonstrate the self-formation of hexagonal nanotemplates on GaAs （111）B substrates patterned with arrays of inverted tetrahedral pyramids during metal-organic vapor phase epitaxy and its role in producing high-symmetry, site-controlled quantum dots （QDs）. By combining atomic force microscopy measurements on progressively thicker GaAs epitaxial layers with kinetic Monte Carlo growth simulations, we demonstrate self-maintained symmetry elevation of the QD formation sites from three-fold to six-fold symmetry. This symmetry elevation stems from adatom fluxes directed towards the high-curvature sites of the template, resulting in the formation of a fully three-dimensional hexagonal template after the deposition of relatively thin GaAs layers. We identified the growth conditions for consistently achieving a hexagonal pyramid bottom, which are useful for producing high-symmetry QDs for efficient generation of entangled photons.
doi_str_mv 10.1007/s12274-016-1206-7
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identifier ISSN: 1998-0124
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1998-0000
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source Springer Nature
subjects Adatoms
Atomic force microscopy
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Computer simulation
Condensed Matter Physics
Curvature
Elevation
Epitaxial growth
Epitaxial layers
Epitaxy
Fluxes
Formations
Gallium arsenide
Growth conditions
Materials Science
Metalorganic chemical vapor deposition
Nanostructure
Nanotechnology
Photons
Pyramids
Quantum dots
Quantum theory
Research Article
Substrates
Symmetry
Thin films
Vapors
六边形
图形衬底
外延法
有机金属
模板
气相外延
自形成
量子点
title Self-formation of hexagonal nanotemplates for growth of pyramidal quantum dots by metalorganic vapor phase epitaxy on patterned substrates
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