Regensburg 2010 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 9: Poster: Synthesis of Nanostructured Films by Self-organization, Thermoelectric Thin Films and Nanostructures, High-k and Low-k Dielectrics, Layer Deposition Processes, Layer Growth, Layer Properties, Application of Thin Films, Surface Modification, Hard and Superhard Coatings, Metal Layers
DS 9.23: Poster
Montag, 22. März 2010, 15:00–17:30, Poster D1
Conducting ion track in tetrahedral amorphous carbon films — •Hans-Gregor Gehrke1, Anne-Katrin Nix1, Johann Krauser2, Christina Trautmann3, Alois Weidinger4, and Hans Hofsäss1 — 1II. Physikalisches Institut, Universität Göttingen, Germany — 2Hochschule Harz, Wernigerode, Germany — 3Gesellschaft für Schwerionenforschung, Darmstadt, Germany — 4Hahn-Meitner-Institut, Berlin, Germany
Swift heavy ions passing through insulating tetrahedral amorphous carbon (ta-C) films leave conducting tracks along their path. The huge energy loss of over 40 keV/nm of each ion transforms the ta-C with 80% sp3 bonds into a graphite-like sp2-rich phase creating nano-sized filaments with a diameter of about 8 nm. The film thickness may vary from a few nanometers to micrometers allowing a vast range of aspect ratios. In addition, it is possible to interrupt the filaments with thin insulating layers which do not alter their conductivity during the irradiation process. This technique, allows the creation of embedded electrical quantum dot structures with dimensions in the nanometer regime. The dimensions are sufficiently small to achieve coulomb blockade effects even at room temperature. We analyzed the conduction of ion tracks and dot structures with different insulator thicknesses electrically on filament ensembles by macroscopic contact pads and single tracks measurements by AFM probing with a conducting tip.