DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 77: Quantum Dots and Wires: Optical Properties II (mainly Luminescence and Electronic Structure)

HL 77.1: Vortrag

Donnerstag, 29. März 2012, 09:30–09:45, EW 203

Optical properties of Arsenide-based nanowire heterostructures — •Lucas Schweickert1, Daniel Rudolph1, Watcharapong Paosangthong1, Dance Spirkoska1, Max Bichler1, Gerhard Abstreiter1,2, Gregor Koblmüller1, and Jonathan J. Finley11Walter Schottky Institut, TU München, Garching, Germany — 2TUM Institute for Advanced Study, Garching, Germany

We report the investigation of the optical properties of single AlGaAs/GaAs core/shell nanowires using low temperature micro-photoluminescence (PL) spectroscopy. The nanowires are grown using a catalyst free method using molecular beam epitaxy on lithographically patterned SiO2-Si(111) substrates [1]. Capping the GaAs nanowires with a thin AlGaAs shell is found to result in a drastic >103 enhancement of the PL intensity. The influence of the capping shell thickness on the PL intensity was investigated for shell thicknesses in the range 8-100nm, under conditions where free carriers are photo-generated in the entire structure and solely in the GaAs core. Time-resolved and temperature-dependent PL studies were performed to obtain a better understanding of the mechanisms that limit the internal quantum efficiency. Furthermore, we will present first results obtained on GaAs-AlGaAs axial nanowires with axial In-containing segments. It is envisaged that optically active quantum dots can be controllably incorporated into axial core-shell nanostructures.

[1] D. Rudolph et al., Nano Lett. 11, 3848 (2011)

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2012 > Berlin