Chemical mechanical polishing of titanium with colloidal silica containing hydrogen peroxide : mirror polishing and surface properties

概要

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Chemical mechanical polishing (CMP) of cpTi (Ti) was carried out using two types of slurries, acidic and basic colloidal silica containing H_2O_2 up to 3wt%, to obtain flat and mirror-polished surfaces without any contaminated and reacted layers. Polishing behavior and surface properties were investigated using AFM, EPMA, and XPS. Weight loss of Ti polished by CMP using the basic slurry was larger than that using the acidic one, and surface roughness was less than 2nm RMS when basic slurry containing 3 wt% H_2O_2 was used. Moreover, three kinds of chemical species, OH^-, O^<2->, and H_2O, were detected on the Ti surfaces polished by CMP using these slurries. Results of this study showed that CMP using colloidal silica containing H_2O_2 successfully created a mirror-polished surface without contaminated and reacted layers.