Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 58: Quantum Dots: Optical Properties IV

HL 58.9: Vortrag

Mittwoch, 22. März 2017, 17:30–17:45, POT 151

Towards the optimization of photodetectors based on ZnO nanowires functionalized with Carbon Nanoparticles (C-Dots) — •Kseniia Zimmermann1, Davide Cammi1, Rene Gorny1, Angelina Vogt1, Frank Dissinger2, Siegfried Waldvogel2, and Tobias Voss11Braunschweig, Institut für Halbleitertechnik, Germany — 2Johannes Gutenberg-Universität Mainz, Institut für Organische Chemie, Germany

Carbon nanoparticles (C-dots) have been first discovered in 2004 by Xu. et al. as a side product during the synthesis of single-wall carbon nanotubes. Since then, they have gained huge attention due to their tunable optical properties, low toxicity and the availability of a variety of relatively easy preparation methods. Today, C-dots are considered to be promising candidates for color conversion in LEDs, as well as further applications in pharmacy and photonic. In this work, the optical properties of different colloidal carbon dots have been investigated and it has been found, that the absorption and emission properties strongly depend on the stabilizing (ligand) molecules, the nature of the solvent and the pH-value of the solution. The C-Dots were subsequently attached to the surface of hydrothermally grown ZnO nanowires in order to study electron transfer processes in the hybrid system. Compared to unfunctionalized nanowires, we have observed enhanced photoconductivity in the hybrid devices under irradiation with photon energies below the band gap energy of the ZnO nanowires, down to 2.1 eV. Such hybrid organic/inorganic structures may be used for light-harvesting and in photodetectors.

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