Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 24: Focus Session: Functional Semiconductor Nanowires II (organized by HL)
TT 24.4: Talk
Monday, March 16, 2015, 16:00–16:15, EW 201
Surface functionalization and its influence on excitonic emission of ZnO nanowires — •Lisa Schade1, Sebastian Resch2, Sascha Creutzburg1, Robert Röder1, Davide Cammi1, Siegfried R. Waldvogel2, and Carsten Ronning1 — 1Institut für Festkörperphysik, FSU Jena, Max-Wien-Platz 1, 07743 Jena — 2Institut für Organische Chemie, JGU Mainz, Duesbergweg 10-14, 55128 Mainz
Semiconductor nanowires (NW) are expected to serve as a basis for next-generation high performance devices as they serve as functional and the electrical or optical connection unit for new devices with enhanced properties. This implementation has already succeeded for NW field effect transistors as well as photonic devices like LEDs, waveguides and lasers. The combination of inorganic semiconductors and organic molecules promises hybrid systems with superior functionality. Electrical and optical properties of semiconductor NWs are very sensitive to the treatment of the surface due to the high surface-to-volume ratio, thus especially the surface bound exciton becomes a dominant feature in low temperature photoluminescence spectra, indicating information about the surface properties. For that reason ZnO NWs were coated with organic molecules and photoluminescence measurements were taken before and after the functionalization. There are some anchor-groups, which are suited for functionalization: e.g. -COO-Bu4N+ and -Si(C2H5O)3 allowing the link of different chains like e.g. C6F12-C2H4- and C8- . Further functionality increase will be achieved by linking organic dyes for photonic devices.