Journal
NANOMATERIALS
Volume 12, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/nano12172981
Keywords
quantum dot; droplet etching; photoluminescence; exciton; biexciton; lifetime; quantum efficiency; pseudopotential calculation
Categories
Funding
- Deutsche Forschungsgemeinschaft [HE 2466/2-1, HA 2042/8-1]
- European Union [721394]
- Bundesministerium fur Bildung und Forschung via ForLab Helios
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Strain-free GaAs quantum dots were fabricated by filling droplet-etched nanoholes in AlGaAs. The size of the quantum dots was precisely controlled by the thickness of the GaAs filling layer. Various characteristics of the quantum dots were studied using single-dot photoluminescence measurements, and the results were interpreted using an atomistic model.
Strain-free GaAs quantum dots (QDs) are fabricated by filling droplet-etched nanoholes in AlGaAs. Using a template of nominally identical nanoholes, the QD size is precisely controlled by the thickness of the GaAs filling layer. Atomic force microscopy indicates that the QDs have a cone-shell shape. From single-dot photoluminescence measurements, values of the exciton emission energy (1.58...1.82 eV), the exciton-biexciton splitting (1.8...2.5 meV), the exciton radiative lifetime of bright (0.37...0.58 ns) and dark (3.2...6.7 ns) states, the quantum efficiency (0.89...0.92), and the oscillator strength (11.2...17.1) are determined as a function of the dot size. The experimental data are interpreted by comparison with an atomistic model.
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