TY - GEN
T1 - Effect of polisher kinematics in reducing average and variance of shear force and increasing removal rate in copper CMP
AU - Sampurno, Yasa
AU - Philipossian, Ara
AU - Theng, Sian
AU - Nemoto, Takenao
AU - Gu, Xun
AU - Zhuang, Yun
AU - Teramoto, Akinobu
AU - Ohmi, Tadahiro
PY - 2009
Y1 - 2009
N2 - The effect of polisher kinematics on average and variance of shear force and removal rate in copper CMP is investigated. A 'delamination triangle' consisting of average shear force, variance of shear force, and required polishing time is defined, and 'delta' is calculated based on the product of the above three components. In general, low values of 'delta' are preferred to minimize defects during polishing. In the first part of this study, 200-mm blanket copper wafers are polished at constant platen rotation of 25 RPM and polishing pressure of 1.5 PS1 with different wafer rotational rates and slurry flow rates. Results indicate that at the slurry flow rate of 400 ml/min, 'delta' is higher by 50 to 290 percent than at 200 ml/min, and increasing wafer rotational rate from 23 to 148 RPM reduces 'delta' by more than 90 percent and improves removal rate within-wafer-non-uniformity by 2X. In the second part of this study, polishing is performed at the optimal slurry flow rate of 200 ml/min and wafer rotational rate of 148 RPM with different polishing pressures and platen rotational rates. Results indicate that 'delta' is reduced significantly at higher ratio of wafer to platen rotational rates.
AB - The effect of polisher kinematics on average and variance of shear force and removal rate in copper CMP is investigated. A 'delamination triangle' consisting of average shear force, variance of shear force, and required polishing time is defined, and 'delta' is calculated based on the product of the above three components. In general, low values of 'delta' are preferred to minimize defects during polishing. In the first part of this study, 200-mm blanket copper wafers are polished at constant platen rotation of 25 RPM and polishing pressure of 1.5 PS1 with different wafer rotational rates and slurry flow rates. Results indicate that at the slurry flow rate of 400 ml/min, 'delta' is higher by 50 to 290 percent than at 200 ml/min, and increasing wafer rotational rate from 23 to 148 RPM reduces 'delta' by more than 90 percent and improves removal rate within-wafer-non-uniformity by 2X. In the second part of this study, polishing is performed at the optimal slurry flow rate of 200 ml/min and wafer rotational rate of 148 RPM with different polishing pressures and platen rotational rates. Results indicate that 'delta' is reduced significantly at higher ratio of wafer to platen rotational rates.
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U2 - 10.1149/1.3096487
DO - 10.1149/1.3096487
M3 - Conference contribution
AN - SCOPUS:77950662945
SN - 9781615676460
T3 - ECS Transactions
SP - 465
EP - 471
BT - ECS Transactions - ISTC/CSTIC 2009 (CISTC)
T2 - ISTC/CSTIC 2009 (CISTC)
Y2 - 19 March 2009 through 20 March 2009
ER -