Multiple Disk Pad Conditioner for CMP Slurry Removal
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Solution Overview
Problem
There is a need for a reliable and uniform method to condition polishing pads in chemical mechanical polishing (CMP) processes, as existing methods struggle to efficiently remove trapped slurry and restore the pad's surface roughness.
Innovation Solution
A multiple disk pad conditioner is introduced, featuring a conditioning arm with multiple conditioning heads, each equipped with a conditioning disk. These disks are designed to rotate and press against the polishing pad, concurrently conditioning and texturing the surface during substrate polishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single conditioning disk is used to condition the polishing pad, then the device complexity is low, but the productivity is reduced due to longer conditioning time
Solution Approach 1:
The polishing pad conditioning process is divided into multiple independent conditioning zones, with each conditioning head containing a separate conditioning disk. Multiple conditioning heads are arranged along the polishing pad surface, allowing simultaneous conditioning of different regions. This segmentation enables parallel processing, reducing total conditioning time while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
The invention transitions from a single-point conditioning approach to a distributed multi-point conditioning system. Conditioning heads are positioned at different locations across the polishing pad surface, creating a two-dimensional array of conditioning zones. This spatial distribution allows concurrent conditioning operations across multiple areas, significantly improving productivity without proportionally increasing complexity.
2Productivity
If multiple conditioning heads are used to increase pad coverage, then the productivity improves, but the device complexity increases
Solution Approach 1:
Multiple conditioning heads are designed with identical or similar structures, each capable of independent conditioning operation. This universality allows the system to achieve extended pad coverage through replication of a standardized module rather than designing increasingly complex unique components. The modular nature simplifies manufacturing, maintenance, and adjustment while maximizing the conditioned area of the polishing pad.
3Reliability
If conditioning disks press against the polishing pad with high force, then the conditioning effectiveness improves, but the conditioning elements wear out faster reducing their useful life
Solution Approach 1:
The total conditioning force required for effective pad conditioning is distributed across multiple conditioning heads rather than concentrated on a single disk. Each conditioning element operates at lower force levels, reducing wear and extending service life. The segmented approach maintains overall conditioning effectiveness through parallel force application across multiple zones of the polishing pad surface.
Solution Approach 2:
Multiple conditioning heads apply conditioning action simultaneously across different regions of the polishing pad, achieving thorough conditioning without requiring excessive force from individual elements. The distributed partial actions combine to produce the desired overall conditioning effect while preserving the longevity of each conditioning component.
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 multiple disk pad conditioner reduces conditioning time, provides more efficient pad coverage, and extends the useful life of conditioning elements by allowing multiple conditioning surfaces to contact the pad simultaneously.
Implementation Method 1
When the polisher is in operation, the pad is subject to compression, shear and friction producing heat and wear
Implementation Method 2
conditioning the pad by removing trapped slurry, and unmatting, re-expanding or re-roughening the pad material
Data Source
AI summary
Embodiments of the present disclosure provide a multiple disk pad conditioner and methods of using the multiple disk pad conditioner during a chemical mechanical polishing (CMP) process. The multiple disk pad conditioner has a plurality of conditioning heads having conditioning disks affixed thereto. The multiple disk pad conditioner can include a conditioning arm, and a plurality of conditioning heads attached to the conditioning arm. Each of the plurality of conditioning heads has a conditioning disk affixed thereto. In some embodiments, each of the conditioning heads include a rotational axis, wherein each of the rotational axes is disposed a distance apart in a first direction that extends along the length of the conditioning arm.