CMP Pad Conditioner Disk with Segmented Channels for Debris Evacuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The accumulation of debris and spent slurry on the surface of the polishing pad in CMP processes leads to reduced polishing performance and efficiency, resulting in particle and diamond scratch defects on semiconductor wafers.
Innovation Solution
A pad conditioner with a conditioning disk that includes abrasive segments and channel segments is used to continuously clean and evacuate debris and spent slurry from the polishing pad. The conditioning disk rotates and translates to reach various regions of the pad, and its channel segments allow for the evacuation of debris through a vacuum module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CMP polishing is performed continuously, then productivity increases, but debris and spent slurry accumulate on the polishing pad causing defects
Solution Approach 1:
The pad conditioner is designed to operate continuously during CMP polishing without interrupting the polishing process. The conditioning disk rotates and translates to continuously clean the polishing pad surface, maintaining polishing performance throughout extended production runs and preventing defect accumulation while sustaining high productivity
Solution Approach 2:
The pad conditioner extracts and removes debris and spent slurry from the polishing pad surface through mechanical action. The conditioning disk with its abrasive and non-abrasive regions physically removes accumulated particles, separating harmful debris from the polishing interface to prevent defect formation
2Reliability
If polishing pad conditioning is performed frequently, then polishing performance is maintained, but production time is reduced
Solution Approach 1:
The pad conditioner performs preliminary cleaning action on the polishing pad during early stages of pad usage before significant debris accumulation occurs. By proactively maintaining pad surface quality throughout the polishing cycle, the system prevents performance degradation rather than requiring corrective conditioning interruptions
Solution Approach 2:
The conditioning function is merged with the polishing process itself. The pad conditioner operates simultaneously with the CMP polishing, combining two functions (polishing and conditioning) into one continuous operation without requiring separate conditioning cycles or production stoppages
3Object-generated harmful factors
If channel segments are added to conditioning disk, then debris evacuation is improved, but device complexity increases
Solution Approach 1:
The conditioning disk is segmented into distinct functional regions including abrasive segments, non-abrasive segments, and channel segments. This segmentation allows each region to perform its specific function (abrading, cleaning, or debris evacuation) efficiently while maintaining overall system simplicity through modular design
Solution Approach 2:
The channel segments act as intermediary structures that facilitate debris evacuation without requiring complex active mechanisms. The channels provide passive pathways for debris removal, mediating between the polishing pad surface and the exterior environment through simple geometric features rather than complex mechanical systems
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
The continuous cleaning and evacuation of debris and spent slurry by the pad conditioner maintain the polishing performance and efficiency of the pad, reducing defect formation on the wafer surface and preventing scratching caused by polishing debris and slurry.
Implementation Method 1
The debris and the spent slurry are evacuated via an opening of a disk arm in fluid communication with the at least one channel segment using a vacuum module
Implementation Method 2
A pad conditioner with a conditioning disk that includes abrasive segments and channel segments is used to continuously clean and evacuate debris and spent slurry from the polishing pad
Data Source
AI summary
A pad conditioner for conditioning a polishing surface of a polishing pad includes a conditioning disk, a disk holder, and a disk arm. The conditioning disk includes a substrate plate and at least two abrasive segments. The conditioning disk includes at least one channel by which debris and spent slurry may be evacuated. The abrasive segments are on a surface of the substrate plate, and form at least one channel segment therebetween. Each channel segment extends from about the center of the surface to substantially the outer rim of the substrate plate. The disk holder to which the conditioning disk is mounted includes a through hole. The disk arm to which the conditioning disk is mounted includes an opening in fluid communication with the at least one channel segment via the through hole for evacuating the debris and spent slurry by a vacuum module.