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• W2041769641 abstract "Studies of amorphous hydrogenated carbon (a-C:H) film deposition revealed that methyl radicals are the precursor species responsible for the bulk mass deposition of the films, while the ions act to improve the mechanical properties. The films were deposited on Si(100) substrates both on the powered (negatively self-biased) and on the grounded electrodes from a methane rf plasma (13.56 MHz) at 68 to 70 mTorr and 300 to 370 K. The films produced on the powered electrode exhibited superior mechanical properties, such as high hardness. A mass spectrometer was used to identify neutral species and positive ions incident on the electrodes from the plasma, and also to measure ion energies. Methyl radicals were incident on the electrode surface with an estimated flux of ${10}^{16}$ ${mathrm{cm}}^{mathrm{ensuremath{-}}2}$ ${mathrm{s}}^{mathrm{ensuremath{-}}1}$, for a rf power of 50 W. Methyl radicals appear to be the dominant intermediates in the growth of the soft carbon polymer, and there is a remarkable decrease in deposition rate due to the introduction of NO, a radical scavenger. A novel pulsed biasing technique was used so that the role of ions in the plasma could be studied separately. It was found that the hardness of the films depends on the power supplied by the ions to the growing film surface (the time averaged difference between the plasma potential and the electrode potential), but not on the energy of individual ions. The pulsed biasing technique offers an efficient method to adjust the film hardness by independent control of the neutral radical and ion fluxes to the surface." @default.
• W2041769641 created "2016-06-24" @default.
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• W2041769641 date "1990-02-15" @default.
• W2041769641 modified "2023-09-23" @default.
• W2041769641 title "Formation of hydrogenated amorphous carbon films of controlled hardness from a methane plasma" @default.
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• W2041769641 doi "https://doi.org/10.1103/physrevb.41.3200" @default.
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