Berlin 2008 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 51: Materials Design II
MM 51.2: Talk
Friday, February 29, 2008, 12:00–12:15, H 0111
Formation of complex 3D networks of anisotropic colloidal nanocrystals — •Stefan Kudera1, Isabella Franchini2, Joachim P. Spatz1, and Liberato Manna2 — 1Max Planck Institut für Metallforschung, Heisenbergstraße 3, 70569 Stuttgart, Germany — 2National Nanotechnology Laboratories of CNR-INFM, Via Arnesano, 73100 Lecce, Italy
Semiconductor nanocrystals can be synthesised in a variety of different shapes. There are standard procedures for the production of spheres and anisotropic nanorods. Additionally it is possible to introduce branching points into the structures in order to obtain objects of a more complicated shape such as bumerang shaped dipods or tetrapods.
Here, we will present a possibility to interconnect colloidal nanocrystals into complex networks. These networks are formed in a solution and they are stable for a certain amount of time, during which they might be deposited on any kind of substrate. Generally the time available for the treatment of the networks is of the order of few minutes. A metallic domain acts as linker between the individual nanocrystals.
As the networks are formed of semiconductor materials they are of interest for the production of solar cells. When embedded into a hole transporting polymer, the nanocrystal network might enable an efficient electron transport towards the anode. Thus, while providing a good electronic contact with the electrode, the network still offers a large surface, on which the charges could be separated.