Pre-CMP Buffing Module Lateral Oscillation Debris Removal
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Solution Overview
Problem
Existing CMP systems face inefficiencies in removing large debris particles from substrates before processing, leading to scratches and requiring slower throughput due to double polishing with different membrane pressures.
Innovation Solution
A pre-CMP buffing module with a rotating polishing pad assembly that oscillates laterally across the substrate, supported by a rotating chuck, using a cleaning slurry to effectively remove debris without slowing down processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CMP systems use double polishing with different membrane pressures to remove large debris particles, then debris removal effectiveness is improved, but processing throughput deteriorates
Solution Approach 1:
The patent applies preliminary action by introducing a pre-CMP buffing step that removes large debris particles before the main CMP process. The pre-CMP buffing module uses a rotating polishing pad with lateral oscillation to eliminate debris particles, so that when substrates enter the conventional CMP system, no additional polishing steps are needed to remove large particles, thus maintaining high throughput while ensuring effective debris removal
2Ease of manufacture
If pre-CMP rinse systems are used to remove large particles, then debris removal is attempted, but removal effectiveness deteriorates for larger particles
Solution Approach 1:
The patent applies dynamics by implementing a lateral oscillation mechanism in the pre-CMP buffing module. The polishing pad not only rotates but also oscillates laterally across the substrate surface, creating dynamic motion that enhances the removal of large debris particles. This dynamic approach is more effective than static rinse systems while maintaining operational simplicity
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
Enhances substrate surface consistency and ensures thorough debris removal without reducing CMP processing speed by integrating a pre-treatment step that prepares the surface for subsequent CMP processing.
Implementation Method 1
a polishing pad assembly adapted to be rotated against a major surface of a substrate; a chuck adapted to hold the substrate and to rotate the substrate against the polishing pad assembly
Data Source
AI summary
The present invention provides methods and apparatus for a pre-CMP semiconductor substrate buffing module. The invention includes a polishing pad assembly adapted to be rotated against a major surface of a substrate; a chuck adapted to hold the substrate and to rotate the substrate against the polishing pad assembly as the polishing pad assembly is rotated; and a lateral motion motor adapted to oscillate the polishing pad assembly laterally across the major surface of the substrate while the polishing pad assembly is rotated against the rotating substrate. Numerous additional features are disclosed.