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HL: Fachverband Halbleiterphysik

HL 19: Quantum Dots and Wires: Optics I

HL 19.5: Vortrag

Dienstag, 19. März 2024, 10:30–10:45, EW 202

Electron capture dynamics into self-assembled quantum dots far from equilibrium with their environment — •Lukas Berg¹, Laurin Schnorr¹, Thomas Heinzel¹, Arne Ludwig², and Andreas Dirk Wieck² — ¹Heinrich-Heine Universität, Düsseldorf, Germany — ²Ruhr-Universität, Bochum, Germany

The electron capture process in self-assembled quantum dots at large distance from the reservoirs is studied by deep level transient spectroscopy. Capture rates are obtained as a function of temperature, applied bias voltage and quantum dot occupancy. The observed activated character of the capture suggests that the back contact is the dominant electron source. A model is developed where electrons diffuse from the reservoir across the barrier onset from the space charge region to be captured by the self-assembled quantum dots.

Keywords: Quantum Dots; Dynamics; Coulomb blockade; Capacitance; DLTS