Communication—Synergistic Effect of Mixed Particle Size on W CMP Process: Optimization Using Experimental Design

초록

We have investigated the synergistic effect with mixing of three different-sized SiO2 abrasives (30 nm-SiO2, 70 nm-SiO2 and 200 nm-SiO2) and the corresponding W chemical mechanical planarization (CMP) performances. W removal rate significantly increased when the different-sized SiO2 abrasives were mixed, which is attributed to the increase in the total contact area between the abrasives and the W film. Based on the statistical model, we obtained the optimal mixing ratio (30 nm,  70 nm,   200 nm) = (0.49, 0.23, 0.28) for the highest W removal rate. These results, investigated in this study, show that the removal rate of W film can be improved via simple mixing process.

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