Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session I
MM 18.3: Poster
Monday, March 16, 2020, 18:15–20:00, P4
Time and temperature resolved in situ investigation of the metal-induced crystallization of amorphous carbon thin films — •Matthias Krause1, Daniel Janke1, Robert Wenisch1, René Heller1, David Rafaja2, and Sibylle Gemming1,3 — 1Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden — 2Institute of Materials Science, TU Freiberg, 09599 Freiberg — 3Institute of Physics, TU Chemnitz, 09126 Chemnitz
The metal-induced crystallization of amorphous carbon in thin film stacks with Ni was investigated in situ as a function of initial stacking order, temperature and time by Rutherford backscattering spectrometry and Raman spectroscopy. Four different bilayer and triple layer stacks were exposed to heating ramps up to 700 °C. Formation of turbostratic carbon occurred simultaneously with a layer exchange (LE) and was completed during the applied heating ramp up to 700 °C. The temperature resolved measurements allowed the determination of the onset temperatures and transition rates as a function of the annealing temperature and the stacking order. Finally, the activation energy for both LE directions was estimated. In combination with the thermodynamic calculations, this in situ study allows to identify the metal-induced crystallization via wetting and diffusion along grain boundaries, instead of dissolution/precipitation upon annealing as the responsible mechanism for crystallization of amorphous carbon with layer exchange in contact with Ni.