Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 14: Poster II

HL 14.21: Poster

Montag, 18. März 2024, 15:00–18:00, Poster F

Oscillator strength of quantum dots from ensemble photoluminescence — •Yannis Rüggen, Nikolai Spitzer, Arne Ludwig, and Andreas D. Wieck — Ruhr-Universität Bochum; Lehrstuhl für Angewandte Festkörperphysik, Bochum, Germany

A special type of semiconductor heterostructures are so-called quantum dots, which have a potential confinement in all spatial dimensions and therefore have discrete energy levels.

In this project, self-organized InAs quantum dots grown by molecular beam epitaxy are investigated. These quantum dots are In-flushed and gradient-grown and will be examined via power-dependent photoluminescence spectroscopy. Based on the laser power, the lifetime of the excitons will be estimated relatively. Two assumptions are made for this. Firstly, it is assumed that there is a direct correlation between the intensity and the quantum dot density. Furthermore, it is assumed that the lifetime is constant over the entire wafer. The aim of the project is to develop a simple method for estimating the lifetime of excitons. Subsequently, this will be verified by lifetime measurements.

Keywords: exciton lifetime; Photoluminescence; In-flushing; quantum dots; density