scholarly journals Atomic scale analysis of self assembled GaAs/AlGaAs quantum dots grown by droplet epitaxy

2010 ◽  
Vol 96 (6) ◽  
pp. 062101 ◽  
Author(s):  
J. G. Keizer ◽  
J. Bocquel ◽  
P. M. Koenraad ◽  
T. Mano ◽  
T. Noda ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Atomic Scale ◽  
Droplet Epitaxy ◽  
Scale Analysis ◽  
Self Assembled

Structural atomic-scale analysis of GaAs/AlGaAs quantum wires and quantum dots grown by droplet epitaxy on a (311)A substrate

2011 ◽  
Vol 98 (19) ◽  
pp. 193112 ◽  
Author(s):  
J. G. Keizer ◽  
M. Jo ◽  
T. Mano ◽  
T. Noda ◽  
K. Sakoda ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Wires ◽  
Atomic Scale ◽  
Droplet Epitaxy ◽  
Scale Analysis

Fabrication of Self-Assembled GaAs/AlGaAs Quantum Dots by Low-Temperature Droplet Epitaxy

1998 ◽  
Vol 37 (Part 1, No. 12B) ◽  
pp. 7158-7160 ◽  
Author(s):  
Chae-Deok Lee ◽  
Chanro Park ◽  
Hwack Joo Lee ◽  
Kyu-Seok Lee ◽  
Seong-Ju Park ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Low Temperature ◽  
Droplet Epitaxy ◽  
Self Assembled

Self-assembled Quantum Dots: From Stranski–Krastanov to Droplet Epitaxy

2011 ◽  
pp. 127-200 ◽  
Author(s):  
Yu. G. Galitsyn ◽  
A. A. Lyamkina ◽  
S. P. Moshchenko ◽  
T. S. Shamirzaev ◽  
K. S. Zhuravlev ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Droplet Epitaxy ◽  
Self Assembled

Growth and Overgrowth of Ge/Si Quantum Dots: An Observation by Atomic Resolution HAADF-STEM Imaging

2004 ◽  
Vol 832 ◽  
Author(s):  
Dan Zhi ◽  
Paul A. Midgley ◽  
Rafal E. Dunin-Borkowski ◽  
Bruce A. Joyce ◽  
Don W. Pashley ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Direct Analysis ◽  
Lateral Spreading ◽  
Dark Field ◽  
Atomic Scale ◽  
Wetting Layer ◽  
Compositional Evolution ◽  
Scanning Transmission ◽  
Annular Dark Field ◽  
Self Assembled

ABSTRACTThe formation of self-assembled quantum dots (QD) is of increasing interest for applications in optical, nanoelectronic, biological and quantum computing systems. From the perspective of fabrication technology, there are great advantages if the whole device can be made using a single Si substrate. Furthermore, GeSi is a model semiconductor system for fundamental studies of growth and material properties. In practice, as the MBE growth of heterostructures is inherently a non-equilibrium process, the formation of self-assembled nanostructures is both complex and sensitive to growth and overgrowth conditions. The morphology, structure and composition of QDs can all change during growth. It is therefore crucial to understand their structures at different stages of growth at the atomic scale. Here, the characterization of QD growth using high-resolution high angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) imaging is presented. Both the formation of uncapped QDs and the effect of the encapsulation are investigated, and the morphological and compositional evolution of the QDs and wetting layers are observed directly at the atomic scale for the first time. During encapsulation, the Ge content in the centres of the QD remains unchanged, despite significant intermixing, lateral spreading and a laterally inhomogeneous Ge distribution inside the Ge QD. The initial non-uniform wetting layer for the uncapped Ge QD becomes uniform after encapsulation, and a 3-monolayer-thick core with ∼ 60% Ge content is formed in the 2 nm-thick wetting layer with an average Ge content of ∼ 30%. The results were obtained by direct analysis of the Z-contrast STEM imaging without involving complex image simulations.

Self-assembled GaAs quantum dots coupled with GaAs wetting layer grown on GaAs (311)A by droplet epitaxy

2010 ◽  
Vol 8 (2) ◽  
pp. 257-259 ◽  
Author(s):  
Takaaki Mano ◽  
Takeshi Noda ◽  
Takashi Kuroda ◽  
Stefano Sanguinetti ◽  
Kazuaki Sakoda
Keyword(s):  
Quantum Dots ◽  
Droplet Epitaxy ◽  
Wetting Layer ◽  
Self Assembled

scholarly journals Ultra-narrow emission from single GaAs self-assembled quantum dots grown by droplet epitaxy

2009 ◽  
Vol 20 (39) ◽  
pp. 395601 ◽  
Author(s):  
T Mano ◽  
M Abbarchi ◽  
T Kuroda ◽  
C A Mastrandrea ◽  
A Vinattieri ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Droplet Epitaxy ◽  
Self Assembled ◽  
Narrow Emission
Sign in / Sign up

Export Citation Format

Share Document