Abstract
The strain field of selectively oxidized AlOx current apertures in an AlGaAs/GaAs mesa is utilized to define the nucleation site of InGaAs/GaAs quantum dots. A design is developed that allows for the self-aligned growth of single quantum dots in the center of a circular mesa. Measurements of the strain tensor applying transmission-electron holography yield excellent agreement with the calculated strain field. Single-dot spectroscopy of site-controlled dots proves narrow excitonic linewidth virtually free of spectral diffusion due to quantum-dot growth in a defect-free matrix. Implementation of such dots in an electrically driven pin structure yields single-dot electroluminescence. Single-photon emission with excellent purity is proved for this device using a Hanbury Brown and Twiss setup. The injection efficiency of the initial pin design is affected by a substantial lateral current spreading close to the oxide aperture. Applying 3D carrier-transport simulation a ppn doping profile is developed achieving a substantial improvement of the current injection.
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Notes
- 1.
We assume that this carrier density corresponds to a capture rate of around 10 ns−1 during the excitation pulse time \( \Delta t_{\text{pulse}} \); see [51] for details.
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Acknowledgements
We would like to thank Jan-Hindrik Schulze for growing samples and Felix Kießling for structural characterization.
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Pohl, U.W. et al. (2020). Stressor-Induced Site Control of Quantum Dots for Single-Photon Sources. In: Kneissl, M., Knorr, A., Reitzenstein, S., Hoffmann, A. (eds) Semiconductor Nanophotonics. Springer Series in Solid-State Sciences, vol 194. Springer, Cham. https://doi.org/10.1007/978-3-030-35656-9_3
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