Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 21: Optical Properties 1

HL 21.11: Talk

Wednesday, September 7, 2022, 18:00–18:15, H32

Spatially Resolved Dynamics of Intra 3d Luminescence of Co in ZnO Nanowires Revealed by Nanoscale X-ray Analysis — •Christian Plass¹, Valentina Bonino², Maurizio Ritzer¹, Lukas Jäger¹, Jaime Segura-Ruiz², Gema Martinez-Criado², and Carsten Ronning¹ — ¹Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743, Jena — ²ESRF - The European Synchrotron, 71 Avenue des Martyrs, 38043 Grenoble, France

Color centers in semiconductors have drawn a lot of interest in recent years. They are able to provide high quality single photon sources. Such color centers can for example be obtained by doping ZnO with Co. The underlying emission processes have to be determined in order to achieve quantum emission by such a system. Hence, there is a strong need to evaluate how the dynamics of the luminescence is influenced by elemental composition and local environment of the color centers. High resolution synchrotron based methods like X-ray fluorescence (XRF) and X-ray excited optical luminescence (XEOL) enable insight into such compositional and functional variations. Simultaneous XRF and XEOL measurements of Co doped ZnO nanowires were conducted: The highly focused X-ray nanobeam at the ID16B-NA station of the European Synchrotron Radiation Facility scanned the nanowire and by analyzing the emitted X-ray fluorescence radiation together with the corresponding optical luminescence correlating maps were obtained. As the spatial resolution is about 50nm, we can show how the local composition influences the spectral dynamics of the obtained emission.