Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 19: Quantum dots and wires: Transport properties
HL 19.5: Talk
Tuesday, March 13, 2018, 10:30–10:45, A 151
Laplace DLTS on InAs-SAQDs — •Laurin Schnorr1, Thomas Heinzel1, Arne Ludwig2, and Andreas Wieck2 — 1Solid State Physics Laboratory, Heinrich-Heine-Universität, Düsseldorf, Germany — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany
Self-assembled InAs quantum dots in a GaAs matrix are studied by Laplace deep level transient spectroscopy (LDLTS). It is shown that in the tunneling regime, the superior resolution in comparison to conventional DLTS weighting functions allows for the separation of the two s-states and a meaningful analysis of the electric field dependence of their life times. It can also be used to check the validity of the widely used tunneling corrections of conventional DLTS results in the thermal emission regime. Furthermore, we use Laplace DLTS to determine the effective height of the self-assembled quantum dots via the Poole-Frenkel effect.