Conductivity in Amorphous Carbon and Amorphous Hydrogenated Carbon Films
There has been a considerable recent interest in amorphous carbon (a-C) and amorphous hydrogenated carbon (a-C:H) films. These films present a combination of a number of useful properties such as a high value of hardness, transparency to visible radiation over a wide wavelength range and high corrosion resistance. Carbon atoms in these materials have both threefold (sp2) and fourfold (sp3) coordination, and the physical properties are determined by the proportion and distribution of sp2 and sp3 sites1. It is known, for example, that in evaporated a-C sp2 sites are essentially uniformly distributed within the material, whereas in a-C:H these sp2 sites form “islands” which are embedded in a matrix consisting essentially of sp3 sites.
KeywordsFermi Level Amorphous Carbon Band Tail Hydrogen Flow Rate Wide Wavelength Range
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