CMP Polishing Pad Grooves Extend Lifespan
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Solution Overview
Problem
Conventional CMP polishing pads have a short lifespan, leading to increased slurry consumption and reduced material removal rates, resulting in higher costs due to frequent replacements.
Innovation Solution
A CMP polishing pad with grooves that penetrate through at least 50% of the pad thickness on both surfaces, featuring interlaced or aligned patterns to ensure continuous flow and extended usage, enhancing slurry retention and pad life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional CMP polishing pads are used, then the polishing process can be performed, but the pad lifespan is short requiring frequent replacements
Solution Approach 1:
The polishing pad is segmented into multiple functional layers with grooves penetrating through at least 50% of the pad thickness to create distinct zones for slurry distribution, polishing action, and waste removal. This segmentation allows optimized performance in each zone while extending overall pad life
Solution Approach 2:
Different regions of the polishing pad are given different properties through the grooving pattern, with grooves strategically positioned to control slurry flow paths, retention times, and polishing medium distribution across the pad surface, thereby extending useful life while managing slurry consumption
2Productivity
If grooves are added to the polishing pad to improve slurry distribution, then polishing performance improves, but the device complexity increases
Solution Approach 1:
The groove pattern is segmented into repeating modular units that simplify manufacturing while maintaining effective slurry distribution. The grooves are arranged in systematic patterns rather than random configurations, reducing design complexity while preserving productivity benefits
Solution Approach 2:
The groove dimensions, depth (penetrating at least 50% of pad thickness), and spacing are optimized as specific parameters to achieve the desired balance between material removal rate and structural simplicity. These parameter optimizations maintain high productivity without requiring overly complex groove geometries
Data Source
AI summary
A polishing pad for polishing a semiconductor wafer or other materials, having grooves in the polishing pad to enhance the usable lifetime of the polishing pad.