Dresden 2014 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 30: Poster: Quantum dots and wires: Preparation, characterization, optical properties and transport
HL 30.19: Poster
Montag, 31. März 2014, 17:00–20:00, P2
Spectroscopy and photon-statistics of InP/AlGaInP quantum dots with reduced spatial density — •Mario Schwartz, Christian A. Keßler, Elisabeth Koroknay, Thomas Schwarzbäck, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Allmandring 3, 70569 Stuttgart, Germany
We investigate the optical properties of self-assembled InP/AlGaInP quantum dots (QDs) with a reduced spatial QD density grown by metal-organic vapor-phase epitaxy. We examine how effective an interruption in the phosphine flow (PH3-stop) during the growth decreases the spatial QD density, with the aim of finding background free single emission lines without any pre- or postprocessing of the samples. The influence of the PH3-stop on the decay dynamics of the QD emission is also investigated. They exhibit a second large decay time which arises from a second excitation of the QD due to carriers trapped in the vicinity of the QDs. We found that the magnitude of the second decay channel reduces using lower excitation energies in the range of the band gap of the AlGaInP barrier. In second order correlation measurements performed at low excitation energies g(2)(0)=0.015 is achieved when background emission is neglected.