AES depth profiling and interface analysis of C/Ta bilayers
Zalar, Anton ...
To study the AES sputter depth profiling of a layered structure with differentlayer densities and sputtering yields, a bilayer structure of C-graphite (60 nm)/Ta (50 nm) was sputter deposited onto ...smooth silicon substrates. The sputtering rates of C and Ta and the depth resolution, ?z, at the C/Ta interfaces were investigated using 1 and 3 keV Ar+ ions, respectively, varying the angle of incidence in the range between 22Ś and 82Ś.It was found that the sputtering rates of Ta and C as well as their ratio are strongly angle dependent. The sputtering induced surface topography deteriorated the depth resolution and was studied by atomic force microscopy (AFM). The ripple structures formed on the surfaces of carbon layers during sputter depth profiling of stationary samples could be avoided by sample rotation. The measured carbon concentration profile revealed a strong electronincidence angle dependent backscattering effect on the C (272 eV) Auger signal. The measured AES depth profile obtained with 1 keV Ar+ ions at an angle of incidence of 49Ś was compared to the theoretical depth profile calculated by the mixing, roughness, information depth (MRI) model taking intoaccount backscattering effect of primary electrons. The measured AES concentration profile agrees well with the simulated one obtained with the MRI model.
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