Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.9: Poster
Wednesday, March 24, 2010, 15:00–17:30, Poster A
Tailoring ferroelectric interfaces: surface modification of PZT mediated through functionalized thiophene derivates — •Peter Milde1, Kinga Haubner2,3, Evelyn Jähne3, Denny Köhler1, Ulrich Zerweck1, and Lukas M. Eng1 — 1Department of Applied Photophysics, TU Dresden, Dresden, Germany — 2Leibniz Institute for Solid State and Materials Research Dresden, TU Dresden, Dresden, Germany — 3Institute of Macromolecular Chemistry and Textile Chemistry, TU Dresden, Dresden, Germany
Organic field effect transistors (OFETs) with a gate "electrode" that is made out of a ferroelectric (FE) have become a field of intense research [1]. Non-volatile memory functionality is expected due to the strong and remanent electric field arising from bound surface charges at the FE/molecular interface. In order to achieve excellent electric transport properties, a high degree of intermolecular ordering is inevitable. In our approach, lead zirconate titanate (PZT) is used as material of choice for the design of an ultra-thin ferroelectric gate electrode in a Ferroelectric-OFET. The focus of the present work lays on the growth process of the molecularly thin organic conduction layer, based on α,ω-dicyano-β,β*-dibutylquaterthiophene (DCNDBQT). Film formation is effectively promoted through specifically designed, bifunctional self-assembling molecules (CNBTPA: 5-cyano-2-(butyl-4-phosphonic acid)-3-butylthiophene) which act as template layer. We report on nc-AFM and KPFM investigation of the template layer's structural and electronic properties.
[1] R. Tamura et al., Thin Solid Films 516, 2753 (2008)