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- W2016603480 abstract "The introduction of porous low- dielectric materials into semiconductor devices requires the development of low downforce Cu chemical mechanical planarization (CMP). An alternative passivation agent, 5-phenyl-1H-tetrazole (PTA), is proposed here that is effective at lower pH than the traditional CMP passivation agent, benzotriazole (BTA). PTA has previously been reported as a low-pH Cu corrosion inhibitor, but has not been explored for Cu CMP. Cu CMP removal rates and Cu static etch rates are measured for slurries containing , glycine, colloidal silica, and PTA concentrations ranging from . At pH 3 and PTA concentrations of , PTA provides both effective passivation and Cu removal rates of . Fourier transform-infrared and electrochemical studies are consistent with the formation of an effective passivation layer on Cu in CMP slurries containing PTA concentrations ranging from , with the effectiveness of passivation increasing with PTA concentration. The improved low-pH passive film formation for PTA in Cu CMP slurries relative to BTA is most likely due to its much lower pKa (4.3), with a much larger fraction of PTA in the anionic form at low pH." @default.
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- W2016603480 date "2008-01-01" @default.
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- W2016603480 title "5-Phenyl-1-H-Tetrazole as a Low-pH Passivating Agent for Copper Chemical Mechanical Planarization" @default.
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- W2016603480 doi "https://doi.org/10.1149/1.2907377" @default.
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