Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.38: Poster

Montag, 26. März 2007, 15:00–17:30, Poster A

Reverse Deep Level Transient Spectroscopy on InAs Quantum Dots — •Christiane Konetzni, Andreas Schramm, Christian Heyn, and Wolfgang Hansen — Institut für Angewandte Physik, Jungiusstraße 11c, 20355 Hamburg

With transient capacitance spectroscopy we study self-assembled InAs quantum dots on (001) GaAs. The quantum dots were grown with solid-source molecular beam epitaxy (MBE) and are embedded in n-doped GaAs Schottky diodes. We apply conventional deep level transient spectroscopy (DLTS) and reverse deep level transient spectroscopy (R-DLTS) to study the s- and p-type quantum-dot levels as well as wettinglayer states. In DLTS experiments the capacitance transients reflect the electron emission rates, whereas in the R-DLTS measurements the transients depend on the electron capture rates. We compare spectra obtained with these methods and point out the advantages of experiments with R-DLTS.