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DS: Fachverband Dünne Schichten

DS 46: Organic Thin Films III

DS 46.8: Talk

Friday, March 26, 2010, 15:45–16:00, H8

Thin films of new organic charge transfer systems — •Milan Rudloff and Michael Huth — Physikalisches Institut, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main

We deal with the preparation and characterization of thin films of organic charge transfer (CT) systems. These systems are made of donor and acceptor molecules that exhibit an additional electrostatic attraction due to Coulomb interaction between donor and acceptor. The electronic properties of the resulting new compound (depending on crystal structure, temperature and pressure) can be those of an insulator, a semiconductor, a metal or a superconductor.
The thin films are prepared by organic molecular beam deposition (OMBD). The OMBD process takes place inside an UHV chamber in which the source materials are (co-) sublimed and deposited onto a substrate. After that the samples are characterized by light and atomic force microscopy, X-ray diffractometry and (temperature dependent) transport measurements.
Our work focuses on new donor-acceptor combinations with the aim to prepare CT compounds that are yet unknown. The results presented here relate to experiments with some of these new donor(D)-acceptor(A) pairs, e.g. tetramethoxypyrene (D) + tetracyanoquinodimethane (A) and tetrathiafulvalene (D) + tetraketopyrene (A).