Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 33: Optical properties

HL 33.5: Vortrag

Dienstag, 17. März 2020, 15:00–15:15, POT 112

Chirooptical activity of surface-functionalized CdS nanorods — •Ilka Vinçon, Aksana Svirydava, Simon Prins, Yiou Wang, Jacek Stolarczyk, and Jochen Feldmann — Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany

Excitonic transition and subsequent charge separation is a key component in photovoltaic studies, as well as in solar water splitting. Introducing chirooptical properties in semiconductor nanocrystals via surface functionalization with chiral molecules has emerged as a promising tool to generate a new class of polarization sensitive materials with potential applications for spintronics, enantioseparation and more. To achieve basic control of chirooptical properties, there is a need to fundamentally understand the mechanism of chirality transfer between a chiral ligand and a nanocrystal's surface. We have chosen CdS nanorods as a suitable material with well-defined excitonic transitions. Circular dichroism (CD) has been induced in the excitonic transitions via surface functionalization with chiral ligands. Since the binding motif seems to play a key role in the chirality transfer, ligands with different anchor groups were attached to the surface of the CdS nanorods. Their influence on optical properties was probed via absorption, photoluminescence and CD spectroscopy.