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HL: Fachverband Halbleiterphysik

HL 8: Poster Session II

HL 8.11: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Examination of self-assembled quantum dots in a density-modulated pattern with capacitance-voltage and photolulminescence spectroscopy — •Nikolai Spitzer, Nikolai Bart, Arne Ludwig, and Andreas Wieck — Ruhr-Universität Bochum

Self-assembled InAs quantum dots (QDs) on GaAs with a QD density modulation upright to the growth direction were grown by molecular beam epitaxy. The QDs can be arranged in stripe patterns whose properties can be changed by a gradient in the GaAs sublayer beneath the QDs. We suspect that the formation of QDs is favoured by atomic rough areas as opposed to flat areas during molecular epitaxial growth. The differences in the sublayer are due to the profile of the molecular beam. Capacitance-voltage spectroscopy and photoluminescence spectroscopy are used to investigate the properties of the quantum dots arranged in this way at different densities.