Hydrogen induced microstructural variation in diamond and diamond like carbon thin films |
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Authors: | V D Vankar |
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Affiliation: | (1) Department of Physics, Indian Institute of Technology, 110 016 New Delhi, India |
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Abstract: | Hydrogen plays a crucial role in the growth of micro-crystalline diamond (MCD) and diamond like carbon (DLC) thin films grown
by plasma assisted chemical vapour deposition (PACVD) processes. It selectively etches graphite phase and helps in stabilizing
the diamond phase. The presence of various hydrocarbon species in the plasma and their reaction with atomic, excited or molecular
hydrogen on the substrate surface decide the mechanism of diamond nucleation and growth. Several mechanisms have been proposed
but the process is still not well understood.
Control of hydrogen and other deposition parameters in the PACVD process leads to deposition of yet another class of materials
called diamond like carbon. By varying the concentration of hydrogen it is possible to produce purely amorphous carbon films
on the one hand and amorphous hydrogenated carbon films (with as high as 60% hydrogen) on the other. Very hard, optically
transparent and electrically insulating films characterize the diamond like behaviour. The proportion of hydrogen and its
bonding with carbon or hydrogen in the film can be varied to obtain very hard to very soft films which could be optically
transparent or opaque. The microstructure of these films have been investigated by a large number of techniques. The results
show interesting situations.
This paper reviews the work on the role of hydrogen on the growth, structure and properties of MCD and DLC thin films. |
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Keywords: | Diamond hydrogen microstructural variation graphite plasma assisted chemical vapour deposition amorphous microcrystalline epitaxy insulator optical properties supersaturation nucleation and growth |
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