Berlin 2008 – scientific programme
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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.75: Poster
Tuesday, February 26, 2008, 14:30–20:00, Poster A
Film formation of oligothiophenes for a molecular organic field-effect transistor — •Kinga Haubner1, Evelin Jaehne1, Hans-Juergen Peter Adler1, Denny Koehler2, Christian Loppacher2, Lukas Eng2, Andrei Herasimovich3, and Susanne Scheinert3 — 1Institute of Macromolecular Chemistry and Textile Chemistry, Technische Universitaet Dresden, 01069 Dresden, Germany — 2Institute of Applied Photophysics, Technische Universitaet Dresden, 01069 Dresden, Germany — 3Solid State Electronics and Center of Micro- and Nanotechnologies, Technische Universitaet Ilmenau, 98684 Ilmenau, Germany
Novel oligomers based on β-substituted thiophene derivatives were synthesized with the aim to build-up a small molecule organic field-effect transistor (OFET). We investigated the properties of the applied films of α,ω-dicyano-β,β′-dibutylquaterthiophene (DCNDBQT) and α,ω-dicyano-β,β′-dibutylsexithiophene (DCNDBST) by different cast methods - spin-coating and vacuum sublimation - as well as thin films of two other oligothiophene derivatives, dibutylquaterthiophene (DBQT) and dibutylsexithiophene (DBST). The ultra-thin organic film formation on TiO2 templates was effectively promoted through the specifically designed, bifunctional self-assembly molecules (SAM). Vacuum sublimated DCNDBQT, which forms a dense packed molecular layer, was used to build-up a nanoscopic OFET-structure. The resulting field mobilities of 10−5 cm2 V−1 s−1 reflect a moderate current density as interpreted in the framework of the ultra-thin molecular OFET structure.