Dresden 2009 – wissenschaftliches Programm
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SYSO: Symposium Self-organizing Surfaces and Interfaces
SYSO 3: Self-Organizing Surfaces and Interfaces - Posters
SYSO 3.22: Poster
Mittwoch, 25. März 2009, 17:30–19:30, P3
Towards a molecularly thin Ferroelectric-OFET: surface modification of ferroelectric PZT films mediated through functionalized thiophene derivatives — •Kinga Haubner1,2, Peter Milde1, Evelin Jaehne2, Denny Koehler1, Ulrich Zerweck1, and Lukas Eng1 — 1Institute of Applied Photophysics, Technische Universität Dresden, 01062 Dresden, Germany — 2Institute of Macromolecular Chemistry , Technische Universität Dresden, 01062 Dresden, Germany
Lead zirconate titanate (PZT) has been used as the substrate material of choice for designing an ultrathin ferroelectric gate electrode in an organic field-effect transistor (Ferro-OFET). The focus of the present work is on the film formation 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 which act as a template layer. We report on nanoscale investigations of the film structure using a combination of X-ray photoelectron spectroscopy (XPS), ellipsometry and non-contact atomic force microscopy (nc-AFM) in combination with Kelvin probe force microscopy (KPFM). Excellent properties were found for those films prepared through in-situ UHV sublimation and analysis. Our measurements indicate that the DCNDBQT molecules form a well-ordered closed packed, dense, and terraced molecular layer exhibiting step heights in the range of approximately 2.0 nm. Therefore, such organic monolayers are well suited as the conduction layer in ultrathin ferroelectric OFET-structures.