DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 28: Correlated Electrons: Low-dimensional Systems - Materials 2

TT 28.10: Vortrag

Mittwoch, 28. März 2012, 17:30–17:45, H 0104

Single crystals and thin films of the new organic charge transfer compound (BEDT-TTF)-DTF — •Kai Ackermann1, Milan Rudloff1, Michael Bolte2, Harald Jeschke3, Matthias Wagner2, Roser Valenti3, and Michael Huth11Physikalisches Institut, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main — 2Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Straße 7, 60438 Frankfurt am Main — 3Institut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main

We investigate the structural and electronic properties of the semiconducting organic charge transfer system (BEDT-TTF)-DTF [bis(ethylenedithio)-tetrathiafulvalene - 9-dicyanomethy-lene-2,4,7-trinitrofluorene]. Crystal structure analysis and X-ray diffractometry show two different phases with monoclinic and triclinic symmetry. Both have a mixed stack configuration with a 1:1 ratio of BEDT-TTF to DTF. A characteristic of the triclinic phase is the layered structure of donor and acceptor molecules. Single crystals of both phases, which are grown from solution, were characterized by temperature-dependent (1.5K - 300K) conductivity measurements in three crystallographic directions and IR-spectroscopy for determining the charge transfer degree. First results of thin film deposition experiments by using organic molecular beam deposition are presented. These films allow to measure the frequency-dependent (20Hz - 100kHz) dielectric constant. The experimental results are discussed in view of band structure calculation within the framework of density functional theory.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2012 > Berlin