CMP Conditioner Disk Cleaning Station for Slurry Removal
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Solution Overview
Problem
Conventional conditioner disks in chemical mechanical polishing (CMP) systems face issues such as corrosion and slurry build-up, leading to reduced lifetime and increased risk of substrate defects, especially during in-situ conditioning, while ex-situ conditioning compromises throughput.
Innovation Solution
Incorporating a cleaning station adjacent to the polishing pad to clean the conditioner disk during polishing operations, using a brush and fluid nozzles to remove slurry and debris, thereby reducing corrosion and extending disk life without significantly affecting throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If in-situ conditioning is performed during substrate polishing, then substrate processing throughput is maintained, but conditioner disk corrosion and slurry build-up increase
Solution Approach 1:
The conditioner disk is cleaned in advance during idle periods between substrate batches, preparing it for the next conditioning cycle. This preliminary cleaning action removes slurry build-up and corrosion products before they accumulate to harmful levels during in-situ conditioning operations, thereby extending disk life while maintaining continuous substrate processing throughput.
Solution Approach 2:
The conditioner disk undergoes periodic cleaning cycles during substrate polishing operations. The disk is cleaned at regular intervals (e.g., after every few substrates) by retracting it to a cleaning station where brushes and fluids remove accumulated slurry. This periodic maintenance allows in-situ conditioning to continue with minimal interruption while preventing excessive corrosion and build-up that would otherwise reduce disk service life.
2Reliability
If conditioner disk is cleaned frequently during in-situ conditioning, then disk life is extended, but substrate processing time is reduced
Solution Approach 1:
The cleaning function is merged with the existing in-situ conditioning system by integrating a cleaning station into the conditioner disk's sweep path. The same motor that drives the conditioner head back and forth across the polishing pad also moves the disk into the cleaning station position. This merging allows cleaning to occur during substrate polishing without requiring separate cleaning equipment or additional processing time, thereby extending disk life while maintaining throughput.
Solution Approach 2:
The conditioner disk cleans itself during its normal operational cycle. As the conditioner head sweeps across the polishing pad, the disk automatically retracts to the cleaning station position where brushes and fluids clean its surface. This self-service cleaning mechanism requires no external intervention or separate cleaning operation, allowing the disk to maintain its service life while the substrate processing continues uninterrupted.
3Ease of manufacture
If conditioner disk cleaning station is integrated adjacent to polishing pad, then cleaning efficiency is improved, but system complexity increases
Solution Approach 1:
The cleaning station is designed as a multi-functional unit that serves multiple purposes: it cleans the conditioner disk surface, stores cleaning fluids (brushes and spray nozzles), and provides a retraction position for the conditioner head. By making the cleaning station universal and multi-functional, the system avoids adding separate dedicated cleaning equipment, thereby improving cleaning efficiency while minimizing the increase in overall system complexity.
Solution Approach 2:
The cleaning station is positioned in the lateral sweep path dimension of the conditioner head rather than adding a separate vertical or temporal cleaning cycle. The conditioner head naturally traverses the cleaning station location during its regular back-and-forth motion across the polishing pad. This dimensional integration allows the cleaning function to be embedded in the existing operational space, improving cleaning access without significantly increasing structural complexity.
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 solution effectively reduces corrosion and slurry build-up on the conditioner disk, prolonging its life and minimizing substrate defects, while maintaining high substrate processing efficiency.
Implementation Method 1
using a brush and fluid nozzles to remove slurry and debris
Implementation Method 2
a conditioner head to hold a conditioner disk against the polishing pad... Contact and motion of the abrasive surface against the polishing pad roughens the polishing surface
Implementation Method 3
using a brush and fluid nozzles to remove slurry and debris
Implementation Method 4
a conditioner head to hold a conditioner disk against the polishing pad... Slurry and abraded material from the wafer and pad are pressed into the pores of the pad material
Implementation Method 5
Chemical mechanical polishing... The substrate is then placed against a rotating polishing pad... a polishing liquid, typically including an abrasive and at least one chemically reactive agent
Implementation Method 6
a polishing liquid, typically including an abrasive and at least one chemically reactive agent, may be spread on the polishing pad
Data Source
AI summary
A polishing system includes a platen to hold a polishing pad, a carrier head to hold a substrate against the polishing pad, a conditioner including a conditioner head to hold a conditioner disk against the polishing pad, a motor to move the conditioner head laterally movable relative to the platen, a conditioning disk cleaning station positioned adjacent the platen to clean the conditioning disk, and a controller configured to cause the motor to, during polishing of the substrate, move the conditioner head back and forth between a first position with the conditioner head over the polishing pad and a second position with the conditioner head in the conditioner disk cleaning station.