Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 53: Poster II

HL 53.17: Poster

Mittwoch, 9. März 2016, 09:30–13:30, Poster A

Luminescence and photoconductivity properties of hybrid Carbon-nanodot/ZnO nanostructures — •Kseniia Sergeeva¹, Angelina Vogt¹, Rene Gorny¹, Frank Dissinger², Sebastian Resch², Siegfried Waldvogel², and Tobias Voss¹ — ¹TU Braunschweig, Institut für Halbleitertechnik, Germany — ²Johannes Gutenberg-Universität Mainz, Institut für Organische Chemie, Germany

Carbon nanodots (C-Dots) have attracted tremendous attention due to their low-cost manufacturing processes, low toxicity, tuneable photolumeniscence and absorption properties, and photochemical stability. All these properties make C-Dots well-suited candidates for LED and gas-sensing technologies. In this work, hydrothermally synthesized C-Dots (as-grown or in a reduced state) were attached electrostatically and covalently to the surface of ZnO nanowires. The C-Dots show a strong blue (reduced particles) or green (as-grown particles) luminescence under irradiation with UV-light (365nm). Models which were recently published in the literature suggest that the luminescence properties of C-Dots can be related to different species of polycyclic aromatic molecules (PAH) which form the core of the dot. Their tuneable luminescence and absorption properties may also be related to varying size-distribution of the synthesised C-dots. The structural properties of the C-Dots together with their polymeric shell were characterized with Raman spectroscopy and FTIR. Photoconductivity measurements of ZnO/C-Dot hybrid structures were carried out to study the electron transfer dynamics from the dots to the oxide material.