Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 44: Poster Session: Quantum Dots and Wires - Transport & Optical Properties
HL 44.6: Poster
Dienstag, 27. März 2012, 09:30–12:30, Poster D
Illumination induced charging peaks observed by capacitance-voltage spectroscopy — •Patrick Alexander Labud, Dirk Reuter, Arne Ludwig, and Andreas Dirk Wieck — Angewandte Festkörperphysik, Ruhr-Universität Bochum
Since 1994 electron-electron and hole-hole interaction has been studied intensively in self-assembled InAs quantum dot (QD) samples using capacitance-voltage spectroscopy (C-V). The energetic positions of the charging peaks are considerably affected by the Coulomb interaction energies and in standard C-V spectra only the Coulomb repulsion is seen. In this contribution we present C-V data obtained under illumination. Under these conditions additional charging peaks appear due to attractive Coulomb interaction between illumination induced holes and electrons tunneling into the QD. We could resolve up to five additional charging peaks belonging to an X0, X1+, X2+, X3+, X4+-complex formed upon electron charging. The individual Coulomb energies are calculated from the charging gate voltage and the charging dynamics is discussed.