Unraveling the deposition mechanism in a -C:H thin-film growth: A molecular-dynamics study for the reaction behavior of C and C H radicals with a -C:H surfaces
Journal of Applied Physics, ISSN: 0021-8979, Vol: 99, Issue: 1
2006
- 26Citations
- 25Captures
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Article Description
In this molecular-dynamics study, we present the simulated growth of thin a -C:H films using the Brenner [(Phys. Rev. B 42, 9458 (1990)] potential. These simulations are relevant for the growth of thin films, grown using low-energy hydrocarbons. In this work, we investigate the reaction mechanisms of both the linear and the cyclic isomers of C3 and C3 H on an a -C:H surface. We found that the cyclic species are always more reactive as compared to the linear species, due to their lower stability. The C3 species are found to be more reactive than the C3 H species, due to steric hindrance of the H atom, shielding the C atom from the surface. The different mechanisms are discussed. The resulting film properties for different flux ratios of C3 and C3 H have also been investigated. It is shown that films as deposited from C3 and C3 H have a low density and show low cross-linking. A clear change in microstructure is observed as the ratio between the cyclic and the linear species changes. These simulations provide insights into the reaction behavior of the investigated species, and how this influences the resulting film properties. © 2006 American Institute of Physics.
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