Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 3: Organic Thin Films
DS 3.4: Vortrag
Montag, 25. Februar 2008, 15:15–15:30, H 2013
Growth and characterization of thin films prepared from F64Pc, a new class of organic molecular semiconductors — •Christopher Keil1, Olga Tsaryova2, Sergiu M. Gorun2, Dieter Wöhrle3, Olaf R. Hild4, and Derck Schlettwein1 — 1Institut für Angewandte Physik, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, D-35394 Gießen, Germany — 2Department of Chemistry and Environmental Science, New Jersey Institute of Technology, University Heights, Newark, New Jersey 07102-1982, USA — 3Institut für Organische und Makromolekulare Chemie, Universität Bremen, Leobener Strasse NW 2, D- 28334 Bremen, Germany — 4Fraunhofer IPMS, Maria-Reiche-Str. 2, D-01445 Dresden, Germany
Thin films of the zinc, copper or vanadium-oxo complexes of F64Pc, a perfluoro(isopropyl)phthalocyanine were prepared by physical vapor deposition in vacuum. Electrical conduction and optical transmission measurements were performed during the deposition of films to analyze the formation of conducting pathways, the mechanism of film growth and intermolecular electronic coupling. Transmission spectra of the films to a large extent resembled those of solutions of the molecules speaking in favor of widely decoupled molecules. A low extent of intermolecular electronic coupling was also concluded from the small specific conductivity 10−11 − 10−9 S cm−1. A further decreasing specific conductivity upon exposure to air confirmed the n-type characteristics expected from the strongly electron- withdrawing characteristics of the perfluoro- alkyl substituents. The potential to apply this new class of molecular semiconductor materials in devices is discussed.