CMP Pad Conditioning via Segmented Disc Velocity Control
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Solution Overview
Problem
Conventional CMP polishing pad conditioning methods using single angular velocity discs result in non-uniform polishing rates and quality, leading to inconsistent substrate processing and reduced pad performance.
Innovation Solution
A conditioning apparatus with a disc composed of multiple subsystem discs, each independently controlled for angular velocity and applied pressure, allowing for varied tangential velocities and pressures to be applied uniformly across the pad, enhancing the conditioning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single angular velocity disc is used for pad conditioning, then the device complexity is reduced, but the manufacturing precision and uniformity of polishing rate deteriorate
Solution Approach 1:
The conditioning disc is divided into multiple independent subsystem discs (e.g., inner disc and outer disc), each capable of rotating at different angular velocities. This segmentation allows independent control of each disc's rotational speed, enabling precise control over the tangential velocity applied to different regions of the polishing pad, thereby achieving uniform polishing across the substrate.
2Manufacturing precision
If multiple subsystem discs with independently controlled angular velocities are used, then the polishing uniformity is improved, but the device complexity increases
Solution Approach 1:
The conditioning disc system incorporates dynamic control capabilities where each subsystem disc can independently adjust its angular velocity during operation. This dynamic adjustment allows the system to optimize polishing uniformity by varying rotational speeds in real-time, while the modular architecture manages complexity through standardized independent units rather than a monolithic complex structure.
3Reliability
If varied tangential velocities are applied during conditioning, then the pad performance and substrate processing consistency are improved, but the control system complexity increases
Solution Approach 1:
Different subsystem discs apply different tangential velocities to different radial zones of the polishing pad. The inner subsystem disc targets the center region while outer subsystem discs address peripheral areas, creating locally optimized conditioning that ensures uniform pad performance across the entire substrate processing area, thereby improving consistency and reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the uniformity of the polishing process, reduces scratches, extends pad lifetime, and lowers costs by optimizing the conditioning process for improved pad performance and substrate processing.
Implementation Method 1
A conditioning apparatus with a disc composed of multiple subsystem discs, each independently controlled for angular velocity and applied pressure, allowing for varied tangential velocities and pressures to be applied uniformly across the pad
Implementation Method 2
pad conditioning is performed to restore the polishing pad by reconditioning the surface of the polishing pad that comes into contact with the substrate during polishing
Data Source
AI summary
A method of using a chemical mechanical polishing (CMP)apparatus that includes a apparatus is provided. The method includes providing a conditioning disc for conditioning the polishing pad, where the conditioning disc includes a plurality of portions of subsystem discs. The portions may be regions of the disc that are concentric. Each portion of the disc is operable to rotate at a different angular velocity. In some embodiments, a different applied loading is provided to each of the portions of the disc in addition to or in lieu of the different angular velocities.