Advanced Materials

Meso-Epitaxial Solution-Growth of Self-Organizing Discotic Liquid-Crystalline Semiconductors

Authors


  • We are deeply indebted to Paul Smith (ETH Zurich) for many helpful discussions, and use of the infrastructure of the Polymer Technology group. The HASYLAB staff is thanked for experimental assistance with the X-ray diffraction experiments. A.M.C. would like to thank the European Commission for financial support by means of a Marie Curie Fellowship (HPMF-CT-2000-00737). N.S. was funded by the Swiss National Science Foundation through a young researcher’s grant, for which she is grateful. M.M.N. and O.B. would like to thank DanSync for financial support. M.W. and K.M. gratefully acknowledge financial support from the “Zentrum für Multifunktionelle Werkstoffe und Miniaturisierte Funktionseinheiten” (BMBF03N 6500), EU-TMR project SISITOMAS, and the “Deutsche Forschungsgemeinshaft” (Schwerpunkt Feldeffekt-Transistoren). Research reported in this article is performed within the EU programme “DISCEL”( Nr. G5RD-CT-2000-00321). Finally, A. L. Forno, Zürich, is acknowledged for providing the facilities permitting efficient conduction of the project.

Abstract

Substituted hexabenzocoronenes (HBCs) form films with supramolecularly ordered columnar stacks that are uniaxially oriented onto poly(tetrafluoroethylene) alignment layers (see Figure). In field-effect transistor (FET) tests, mobilities of up to 10–3 cm2 V–1 s–1 and high on–off ratios of more than 104 were derived for these aligned HBC films, characteristics superior to FETs prepared from isotropic HBC layers.

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