Carbon Films Obtained from Fullerenes Deposited on Germanium: Experimental and Simulated Results

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In this work, carbon thin films have been experimentally produced by accelerating C60 ions on germanium substrates at different deposition energies (from 50–1000eV). Adherence and chemical composition have been studied in order to characterize the obtained material. On the other hand, molecular dynamics simulations have been used to investigate the microscopic processes of the growth of carbon thin films obtained from the collision of C60 molecules on germanium substrates. The Tersoff potential has been employed to describe the atomic interactions. Some properties of the films have been studied as a function of the deposition energy (from 10–1000eV): interface thickness, density profile from the substrate up to the film surface, etc. Experimental and simulated results have been correlated to those obtained on silicon by similar methods. The results show that the structural and dynamical properties of the films depend on deposition energy, as it was observed on silicon substrates. For the studied energies, the simulated interface thickness is larger in germanium substrates than in silicon ones. However, experimentally observed adherence is poorer on germanium substrates.


Physics and Astronomy

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Physical Review B