We report on the improved assembly and characterization of a small molecule organic field-effect transistor (OFET). Novel α,ω-dicyano substituted β,β'-dibutylquaterthiophene molecules (DCNDBQT) were synthesized and characterized by UV-Vis spectroscopy. differential scanning calorimetry, thermal gravimetric analysis and cyclic voltammetry. The ultra-thin organic film formation on TiO ₂ templates was effectively promoted through the specifically designed bifunctional self assembly molecules (SAM) 5-cyano-2-(butyl-4-phosphonic acid)-3-butylthiophene (CNBTPA). Excellent structural properties were found for up to 9 DCNDBQT molecule thick films prepared through UHV vacuum sublimation as investigated with UHV non-contact atomic force microscopy (nc-AFM) and X-ray diffraction. Both X-ray and nc-AFM data indicate that the DCNDBQT molecules form a well-ordered terraced structure exhibiting step heights of 1.5 nm to 2.0 nm layers. Hence, the DCNDBQTmoleeules are linked to the functional SAM interlace layer by H-bond interactions (see structure model) standing quasi perpendicular to the TiO ₂ template, and thus providing optimal orbital overlap neigh-bouring thiophene rings. The vacuum sublimated DCNDBQT molecules forma closed packed and dense molecular layer that was used to construct and operate a nanoscopic OFET-structure. The resulting Held mobilities of 10 ^-5 cm ² V ^-1 s ^-1 reflect a high current density in our ultrathin but highly ordered structure.