Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.13: Poster
Mittwoch, 24. März 2010, 15:00–17:30, Poster A
Conductivity improvement of graphite-like ion tracks in tetrahedral amorphous carbon — •Anne-Katrin Nix1, Hans-Gregor Gehrke1, Johann Krauser2, Christina Trautmann3, Alois Weidinger4, and Hans Hofsäss1 — 1II. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Hochschule Harz, University of Applied Sciences, 38855 Wernigerode, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany — 4Helmholtz-Zentrum Berlin für Materialien u. Energie, 14109 Berlin, Germany
The irradiation of insulating tetrahedral amorphous carbon (ta-C) with swift heavy ions leads to creation of conductive ion tracks of 8 nm dia-meter and length depending on the film thickness. Our recent studies show that the track conductivity increases in ta-C layers of lower sp3 bond content, which in turn increases the overall conductivity of the surrounding matrix. To improve the track conductivity and retain the insulating properties of ta-C, two approaches were made. First, doped ta-C films were prepared by mass selected ion beam deposition, together with iron or nitrogen as a dopant. These few impurities in the matrix are expected to improve the ion track conductivity by increasing the number of hopping sites because the conduction process is known to be dominated by variable-range hopping. Second, ta-C samples were irradiated with C60 projectiles, which have a much higher energy loss than monoatomic projectiles, and thus form larger and more conductive tracks.