摘要:
Embodiments described herein use closed-loop control (CLC) of conditioning sweep to enable uniform groove depth removal across the pad, throughout pad life. A sensor integrated into the conditioning arm enables the pad stack thickness to be monitored in-situ and in real time. Feedback from the thickness sensor is used to modify pad conditioner dwell times across the pad surface, correcting for drifts in the pad profile that may arise as the pad and disk age. Pad profile CLC enables uniform reduction in groove depth with continued conditioning, providing longer consumables lifetimes and reduced operating costs.
摘要:
Embodiments described herein use closed-loop control (CLC) of conditioning sweep to enable uniform groove depth removal across the pad, throughout pad life. A sensor integrated into the conditioning arm enables the pad stack thickness to be monitored in-situ and in real time. Feedback from the thickness sensor is used to modify pad conditioner dwell times across the pad surface, correcting for drifts in the pad profile that may arise as the pad and disk age. Pad profile CLC enables uniform reduction in groove depth with continued conditioning, providing longer consumables lifetimes and reduced operating costs.
摘要:
A method and apparatus for conditioning a polishing pad is provided. The conditioning element is held by a conditioning arm rotatably mounted to a base at a pivot point. An actuator pivots the arm about the pivot point. The conditioning element is urged against the surface of the polishing pad, and translated with respect to the polishing pad to remove material from the polishing pad and roughen its surface. The interaction of the abrasive conditioning surface with the polishing pad surface generates a frictional force. The frictional force may be monitored by monitoring the torque applied to the pivot point, and material removal controlled thereby. The conditioning time, down force, translation rate, or rotation of the conditioning pad may be adjusted based on the measured torque.
摘要:
A method and apparatus for conditioning a polishing pad is provided. The conditioning element is held by a conditioning arm rotatably mounted to a base at a pivot point. An actuator pivots the arm about the pivot point. The conditioning element is urged against the surface of the polishing pad, and translated with respect to the polishing pad to remove material from the polishing pad and roughen its surface. The interaction of the abrasive conditioning surface with the polishing pad surface generates a frictional force. The frictional force may be monitored by monitoring the torque applied to the pivot point, and material removal controlled thereby. The conditioning time, down force, translation rate, or rotation of the conditioning pad may be adjusted based on the measured torque.
摘要:
Apparatus and methods for conditioning a polishing pad in a CMP system are provided. In one embodiment, a method includes performing a pre-polish process including urging a conditioner disk against a polishing surface of a polishing pad disposed in a polishing station, moving the conditioner disk relative to the polishing pad in a sweep pattern across the polishing surface while monitoring a rotational force value required to move the conditioner disk relative to the polishing pad, determining a metric indicative of an interaction between the conditioner disk and the polishing surface from the rotational force value, adjusting a polishing recipe in response to the metric, and polishing one or more substrates using the adjusted polishing recipe.
摘要:
Apparatus and methods for conditioning a polishing pad in a CMP system are provided. In one embodiment, a method includes performing a pre-polish process including urging a conditioner disk against a polishing surface of a polishing pad disposed in a polishing station, moving the conditioner disk relative to the polishing pad in a sweep pattern across the polishing surface while monitoring a rotational force value required to move the conditioner disk relative to the polishing pad, determining a metric indicative of an interaction between the conditioner disk and the polishing surface from the rotational force value, adjusting a polishing recipe in response to the metric, and polishing one or more substrates using the adjusted polishing recipe.
摘要:
Embodiments of the present invention generally relate to methods for chemical mechanical polishing a substrate. The methods generally include measuring the thickness of a polishing pad having grooves or other slurry transport features on a polishing surface. Once the depth of the grooves on the polishing surface is determined, a flow rate of a polishing slurry is adjusted in response to the determined groove depth. A predetermined number of substrates are polished on the polishing surface. The method can then optionally be repeated.
摘要:
A method of controlling polishing includes polishing a substrate, monitoring the substrate during polishing with an in-situ spectrographic monitoring system to generate a sequence of measured spectra, selecting less than all of the measured spectra to generate a sequence of selected spectra, generating a sequence of values from the sequence of selected spectra, and determining at least one of a polishing endpoint or an adjustment for a polishing rate based on the sequence of values.
摘要:
A substrate having a plurality of zones is polished and spectra are measured. For each zone, a first linear function fits a sequence of index values associated with reference spectra that best match the measured spectra. A projected time at which a reference zone will reach the target index value is determined based on the first linear function, and for at least one adjustable zone, a polishing parameter adjustment is calculated such that the adjustable zone has closer to the target index at the projected time than without such adjustment. The adjustment is calculated based on a feedback error calculated for a previous substrate. The feedback error for a subsequent substrate is calculated based on a second linear function that fits a sequence of index values associated with reference spectra that best match spectra measured after the polishing parameter is adjusted.
摘要:
A substrate having a plurality of zones is polished and spectra are measured. For each zone, a first linear function fits a sequence of index values associated with reference spectra that best match the measured spectra. A projected time at which a reference zone will reach the target index value is determined based on the first linear function, and for at least one adjustable zone, a polishing parameter adjustment is calculated such that the adjustable zone has closer to the target index at the projected time than without such adjustment. The adjustment is calculated based on a feedback error calculated for a previous substrate. The feedback error for a subsequent substrate is calculated based on a second linear function that fits a sequence of index values associated with reference spectra that best match spectra measured after the polishing parameter is adjusted.