Investigation of FIB assisted CoSi2 nanowire growth
The ion beam synthesis process of CoSi2 by writing stoichiometric ion implantation and subsequent annealing has been studied. For this a Focused Ion Beam (FIB), equipped with a Co36Nd64 alloy liquid metal ion source, was applied. Si(100) and (111) wafers were implanted with 60keV Co2+ ions in the dose range of 2101621017cm?2. The implantation parameters, like pixel dwell time, relaxation time, dose rate as well as the pixel overlapping factor were investigated. During subsequent annealing CoSi2 nanostructures with dimensions down to 10nm have been achieved. To investigate the silicide formation more in detail the annealing process was done in situ in a transmission electron microscope (TEM) on a pre-dimpled and FIB implanted samples of a Si(111). The formation of the cobalt silicide nano-crystals was monitored by plane-view TEM imaging during a 30min heat treatment at 600C in vacuum.
nanowire ion beam synthesis focused ion beam cobaltdisilicide