I'm trying to make some tunnel junctions that require forming about 25 angstroms of NiO on an evaporated nickel surface, and then putting down some more nickel on top. Currently I'm doing it in a very low power oxygen plasma in a separate tool, but I could get much better oxide if I could do it without breaking vacuum.
The evaporator has a rotating chuck, which makes it a bit difficult to fit a plasma plate inside, so a colleague of mine suggested doing the oxidation using low-pressure ozone, say 100 mT. Google doesn't appear to find anything very relevant, other than a 1997 paper on putting down NiO2 using molecular beams in a very low pressure ozone atmosphere.
Does anyone here have a reference on ozone oxidation of metal surfaces?
Thanks,
Phil Hobbs