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- W2095759853 abstract "We report an oxalic acid (OA)-based, nonalkaline slurry for chemical mechanical planarization (CMP) of interconnect structures containing Cu/Ta over mechanically and chemically fragile, low- dielectrics. This slurry uses a single dispersion (a pH-controlled mixture of OA, hydrogen peroxide, and fumed silica) to remove both Cu lines and Ta barrier by simply varying the operating pH. Chemically promoted Ta removal is achieved at nearly pH-independent rates between pH 3.0 and 6.0. Cu planarization can be pH-tuned to remove bulk Cu at high rates at pH 3.0 and residual Cu at lower rates (to minimize dishing) at ." @default.
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- W2095759853 date "2008-01-01" @default.
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- W2095759853 title "Oxalic-Acid-Based Slurries with Tunable Selectivity for Copper and Tantalum Removal in CMP" @default.
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- W2095759853 doi "https://doi.org/10.1149/1.2829112" @default.
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