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• W2046133047 abstract "Complexing agents in Cu chemical mechanical planarization slurries promote dissolution of the copper surface. We explored the effect of two chelating compounds, ammonium oxalate and oxalic acid, with and without hydrogen peroxide, on the dissolution and surface morphology of a Cu(111) surface at neutral pH. Without hydrogen peroxide, static etch rate (SER) measurements were highest for oxalic-acid-containing solutions, but with peroxide, ammonium-oxalate-containing solutions demonstrated the highest rates. The largest anodic and cathodic currents were seen in solutions containing ammonium oxalate and peroxide using cyclic voltammetry. In the presence of oxalic acid, atomic force microscopy revealed a thick layer on the surface, identified as on the basis of X-ray photoelectron spectroscopy measurements, that changed little over time. In the presence of ammonium oxalate, the film was thinner and showed accelerated dissolution. It is proposed that the dissolution processes of oxalate and ammonium operate independently at the same time. In the presence of peroxide, more is created which allows for the formation of more copper oxalate, and also increases the concentration of copper oxide species at the surface, which drives the ammonia complexation reaction. These two events give rise to a large increase in SER." @default.
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• W2046133047 date "2009-01-01" @default.
• W2046133047 modified "2023-09-26" @default.
• W2046133047 title "Synergy of Ammonium Oxalate and Hydrogen Peroxide on the Dissolution of Copper at Neutral pH" @default.
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• W2046133047 doi "https://doi.org/10.1149/1.3129611" @default.
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