Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 68: Metal-Semiconductor Hybrids
HL 68.5: Vortrag
Donnerstag, 10. März 2016, 11:15–11:30, H10
Plexciton dynamics studied by Transient Absorption Spectroscopy — •Emanuele Minutella1,2, Florian Schulz1,2, Christian Strelow1, Horst Weller1,2, and Holger Lange1,2 — 1Institut für Physikalische Chemie, Universität Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany
Hybrid nanosystems composed of semiconductor nanoparticles (NPs) and metal NPs have different properties then each component of its own. In case of strong coupling, the exciton-plasmon coupling can lead to a collective state, also called plexciton. It is strongly influenced by the energy difference between the two systems, the size of the NPs and their distance. Although this system gives amazing possibilities, e.g. for defined charge and energy transfer in solar cells, experiments on this system remain rare.
To address the dynamics of this system the method of choice is femtosecond transient absorption spectroscopy. By varying the pump wavelength it is possible to perform resonant excitation, either within the exciton or the plasmon, or to excite both off-resonant simultaneously.
Au NPs and CdSe NPs were synthesized by wet chemical synthesis enabling to adjust their size. To control the interparticle distance the CdSe NPs were embedded in a stiff polymer shell with a variable thickness. We show first results on individual Au and CdSe NPs as well as their aggregates.