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Séminaire Chimie ED459

Dimensionality and alignment of organic semiconductors

Prof. Yves Geerts (Polymer Chemistry Department, ULB Université Libre de Bruxelles, Belgique)

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Le Jeudi 08 Juillet 2010 à 15h
UM2, salle de cours SC-25.01

Discotic (disc-like) molecules typically comprising a rigid aromatic core and flexible peripheral chains have been attracting growing interest because of the fundamental importance as model systems for the study of charge and energy transport and due to the perspectives of their application in organic electronic devices. The talk will cover various aspects of the recent research on discotic liquid crystals, in particular, molecular concepts, supramolecular structure, processing of ordered thin films and fabrication of electronic devices. The size and chemical structure of the conjugated core of discotic molecules govern, to a large extent, their electronic properties Variation of the peripheral flexible chains and connecting groups between side chains and aromatic core is decisive for the tuning of self-assembly in solution and in bulk. Special attention is given to the interesting synthetic concepts based on low-symmetry disc-like molecules have received. Supramolecular organization of discotic molecules is closely related to the molecular design and can be efficiently controlled by the suitable processing methods. In particular, approaches to obtain suitable macroscopic orientations of columnar superstructures on surfaces, that is, planar uniaxial or homeotropic alignment, will be discussed together with appropriate processing techniques. Finally, an overview of charge transport in discotic materials and their application in semiconducting devices will be given.

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