Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Poster IA (Ultrafast phenomena; Optical properties; Transport; Theory)

HL 20.14: Poster

Montag, 16. März 2015, 15:00–20:00, Poster B

Optical Properties of a Palladium-Tin Clusters as a Model System for Interfaces on a Molecular Scale — •Andre Rinn, Niklas Rinn, Stefanie Dehnen, and Sangam Chatterjee — Philipps-Universität Marburg, Germany

Palladium-containing compound-materials are of great interest for their catalytic properties. We have successfully grown a new Pd-Sn cluster with an organic shell which is a promising candidate for a next-generation heterogenic catalyst. From a more fundamental point of view, the interaction of the Pd and Sn core with the outer organic shell makes this cluster an interesting model system for internal interfaces on a molecular scale.

The compound crystalizes into micrometer-sized, well-ordered single-crystalline needles which are relatively ambient-insensitive. To characterize their optical response we perform linear absorption and steady-state PL under vacuum conditions in a microscopy setup containing all-reflective optics. Next, we study the transfer between the Pd-containing core and the outer shell for various excitation energies and fluencies to identify the charge-transfer mechanisms. Furthermore, the influence of different ambient conditions is investigated to explore surface adhesion effects on the optical response.

Financial support by the German Research foundation in the Framework of SFB 1083 is gratefully acknowledged.