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Self-assembled quantum dots in a nanowire system for quantum photonics.
M Heiss1, Y Fontana, A Gustafsson
1Laboratoire des Matériaux Semiconducteurs, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
Nature Materials
|February 5, 2013
Summary
Researchers developed self-assembling quantum dots in nanowires for quantum photonics. These reproducible quantum dots offer precise positioning and unique optical properties, paving the way for advanced lighting and solar cell technologies.
Area of Science:
- Nanotechnology
- Quantum Photonics
- Materials Science
Background:
- Quantum dots within nanowires are promising for quantum photonics.
- Top-down fabrication is challenging; bottom-up self-assembly offers a powerful alternative.
- Current methods struggle with reproducibility due to large optical linewidths.
Purpose of the Study:
- To present a versatile, reproducible quantum-dot-in-nanowire system via self-assembly.
- To demonstrate precise positioning and stability of quantum dots.
- To investigate the origin of unusual optical properties.
Main Methods:
- Core-shell Gallium Arsenide/Aluminum Gallium Arsenide (GaAs/AlGaAs) nanowire fabrication.
- Self-assembly of quantum dots at the nanowire apex.
- Large-scale electronic structure calculations.
Main Results:
- Reproducible self-assembly of quantum dots in GaAs/AlGaAs nanowires.
- Quantum dots exhibit high stability and nanometre-precision positioning.
- Observed blue-shifted emission attributed to quantum confinement by Al-rich barriers.
Conclusions:
- The developed system overcomes reproducibility challenges in quantum dot fabrication.
- Precise control over quantum dot properties is achieved through self-assembly.
- These quantum dots are suitable for solid-state lighting and next-generation solar cells.
