Istituto per lo Studio dei Materiali Nanostrutturati     
Choongik K., Marks T. J., Facchetti A., Schiavo M., Bossi A., Maiorana S., Licandro E., Todescato F., Toffanin S., Muccini M., Graiff C. Synthesis, characterization, and transistor response of tetrathia-[7]-helicene precursors and derivatives. In: Organic Electronics, vol. 10 pp. 1511 - 1520. Elsevier, 2009.
In this paper we report polycyclic, fully-conjugated, heteroaromatic compounds 1-5,two of them having a helical shape (tetrathia-[7]-helicenes 1 and 2), and explore their potential use as p-type semiconductors for organic thin-film transistors (OTFTs). Furthermore, we describe their optical absorption, emission, and electrochemical properties. In addition, the single crystal X-ray diffraction structure for compound 3 is reported. Thin films of all compounds were fabricated on several substrates at different temperatures by physical vapor deposition, and were characterized by optical spectroscopy, wide-angle X-ray diffraction, atomic force microscopy, and TFT measurements. The AFM images of compound 1 exhibit an interesting tubular morphology for films deposited at room temperature. This is the first observation of a compound with a helical shape leading to a nanowire-like morphology. In agreement with the molecular structure/morphology, only compound 4 is a p-type semiconductor with good carrier mobility.
Subject Vacuum deposition
p-Type semiconductor
Organic thin-film transistor

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