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Self-assembled quantum dots in a nanowire system for quantum photonics

Heiss, M. ; Fontana, Y. ; Gustafsson, Anders LU ; Wuest, G. ; Magen, C. ; O'Regan, D. D. ; Luo, J. W. ; Ketterer, B. ; Conesa-Boj, S. and Kuhlmann, A. V. , et al. (2013) In Nature Materials 12(5). p.439-444
Abstract
Quantum dots embedded within nanowires represent one of the most promising technologies for applications in quantum photonics. Whereas the top-down fabrication of such structures remains a technological challenge, their bottom-up fabrication through self-assembly is a potentially more powerful strategy. However, present approaches often yield quantum dots with large optical linewidths, making reproducibility of their physical properties difficult. We present a versatile quantum-dot-innanowire system that reproducibly self-assembles in core-shell GaAs/AlGaAs nanowires. The quantum dots form at the apex of a GaAs/AlGaAs interface, are highly stable, and can be positioned with nanometre precision relative to the nanowire centre. Unusually,... (More)
Quantum dots embedded within nanowires represent one of the most promising technologies for applications in quantum photonics. Whereas the top-down fabrication of such structures remains a technological challenge, their bottom-up fabrication through self-assembly is a potentially more powerful strategy. However, present approaches often yield quantum dots with large optical linewidths, making reproducibility of their physical properties difficult. We present a versatile quantum-dot-innanowire system that reproducibly self-assembles in core-shell GaAs/AlGaAs nanowires. The quantum dots form at the apex of a GaAs/AlGaAs interface, are highly stable, and can be positioned with nanometre precision relative to the nanowire centre. Unusually, their emission is blue-shifted relative to the lowest energy continuum states of the GaAs core. Large-scale electronic structure calculations show that the origin of the optical transitions lies in quantum confinement due to Al-rich barriers. By emitting in the red and self-assembling on silicon substrates, these quantum dots could therefore become building blocks for solid-state lighting devices and third-generation solar cells. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Materials
volume
12
issue
5
pages
439 - 444
publisher
Nature Publishing Group
external identifiers
  • wos:000317954800015
  • scopus:84876679524
ISSN
1476-4660
DOI
10.1038/NMAT3557
language
English
LU publication?
yes
id
33f42362-ca9f-466c-9a1f-567610c46a5d (old id 3843850)
date added to LUP
2016-04-01 10:20:25
date last changed
2020-10-07 01:35:54
@article{33f42362-ca9f-466c-9a1f-567610c46a5d,
  abstract     = {Quantum dots embedded within nanowires represent one of the most promising technologies for applications in quantum photonics. Whereas the top-down fabrication of such structures remains a technological challenge, their bottom-up fabrication through self-assembly is a potentially more powerful strategy. However, present approaches often yield quantum dots with large optical linewidths, making reproducibility of their physical properties difficult. We present a versatile quantum-dot-innanowire system that reproducibly self-assembles in core-shell GaAs/AlGaAs nanowires. The quantum dots form at the apex of a GaAs/AlGaAs interface, are highly stable, and can be positioned with nanometre precision relative to the nanowire centre. Unusually, their emission is blue-shifted relative to the lowest energy continuum states of the GaAs core. Large-scale electronic structure calculations show that the origin of the optical transitions lies in quantum confinement due to Al-rich barriers. By emitting in the red and self-assembling on silicon substrates, these quantum dots could therefore become building blocks for solid-state lighting devices and third-generation solar cells.},
  author       = {Heiss, M. and Fontana, Y. and Gustafsson, Anders and Wuest, G. and Magen, C. and O'Regan, D. D. and Luo, J. W. and Ketterer, B. and Conesa-Boj, S. and Kuhlmann, A. V. and Houel, J. and Russo-Averchi, E. and Morante, J. R. and Cantoni, M. and Marzari, N. and Arbiol, J. and Zunger, A. and Warburton, R. J. and Fontcuberta i Morral, A.},
  issn         = {1476-4660},
  language     = {eng},
  number       = {5},
  pages        = {439--444},
  publisher    = {Nature Publishing Group},
  series       = {Nature Materials},
  title        = {Self-assembled quantum dots in a nanowire system for quantum photonics},
  url          = {http://dx.doi.org/10.1038/NMAT3557},
  doi          = {10.1038/NMAT3557},
  volume       = {12},
  year         = {2013},
}