Atomic force microscopy has been used to study the surface irregularit
ies of hydrogenated and unhydrogenated carbon films grown by rf-powere
d glow discharge and dc-magnetron sputtering, respectively. It is foun
d that films produced with the latter technique have rougher surfaces.
- Roughness can be reduced by increasing the rf-power density in glow
discharge films and by decreasing the substrate temperature in sputter
ed films.