Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 109: Ultra-fast phenomena I

HL 109.4: Talk

Friday, April 4, 2014, 10:15–10:30, POT 006

Atomistic Modeling of Excitation Energy Transfer in a Semiconductor Nanocrystal Molecule Hybrid System — •Dirk Ziemann and Volkhard May — Institut für Physik, Newtonstr. 15, Humboldt Universität zu Berlin, D-12489 Berlin, Germany

Inorganic organic hybrid systems can show completely new properties that are not achievable by each material alone. Especially photovoltaic devices like solar cells and light emitting diodes are able to benefit from these properties. Corresponding to these devices semiconductor nanocrystals interacting with organic molecules have aroused great interest. Despite the variety of experimental investigations there is a lack of theoretical studies.

In this talk an efficient model for describing energy transfer on an atomistic level between a CdSe semiconductor nanocrystal and a molecular system consisting of Pheophorbide-a molecules is presented. Despite the modeling of nanocrystals consisting of thousands of atoms also the coupling to a supramolecular complex is shown. For the nanocrystal also surface effects are taken into account and the formation of exciton states is considered.