CMP Nozzle Manifold Layout to Prevent Slurry Cross-Contamination
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Solution Overview
Problem
Conventional chemical mechanical polishing (CMP) systems face high costs due to cross-contamination issues in the recovery of used polishing fluids, leading to expensive reuse processes.
Innovation Solution
A manifold assembly with separate slurry-collecting and cleaning nozzles, each with dedicated valves and plumbing lines, is used to collect and clean CMP fluids, preventing cross-contamination by ensuring the nozzles do not fluidly communicate with each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single plumbing line is used to collect and clean CMP fluids, then the device complexity is reduced, but cross-contamination occurs between slurry collection and cleaning operations
Solution Approach 1:
The patent divides the single plumbing line into separate dedicated lines: a slurry-collecting line for collecting used polishing fluid and a cleaning line for delivering cleaning agents. This segmentation prevents cross-contamination by ensuring that cleaning agents do not mix with slurry collection, directly resolving the technical contradiction between reliability and device complexity.
2Reliability
If separate slurry-collecting and cleaning nozzles are used, then cross-contamination is prevented, but the device complexity increases
Solution Approach 1:
The patent implements separate nozzles mounted on the manifold: a slurry-collecting nozzle positioned to collect fluid from the gutter, and a cleaning nozzle positioned to deliver cleaning agents. Each nozzle has its own dedicated valve and plumbing line, ensuring complete separation of functions and preventing cross-contamination while maintaining manageable structural complexity through modular design.
3Device complexity
If the slurry-collecting nozzle is used to dispense cleaning agents, then the device complexity is reduced, but cross-contamination occurs and additional treatments are required
Solution Approach 1:
The patent assigns exclusive functions to each nozzle: the slurry-collecting nozzle is dedicated solely to collecting used polishing fluid through its own valve-controlled line, while the cleaning nozzle is dedicated solely to delivering cleaning agents through a separate valve-controlled line. This functional segmentation eliminates cross-contamination and the associated loss of substance, resolving the contradiction between device complexity and fluid purity.
4Reliability
If additional treatments are applied to contaminated CMP fluids, then the purity of reused fluid is improved, but the cost of fluid reuse increases
Solution Approach 1:
The patent implements preliminary action by using dedicated separate plumbing lines and nozzles to prevent cross-contamination before it occurs. The slurry-collecting line and cleaning line are completely separated with individual valves, ensuring that cleaning agents never contaminate the slurry collection. This preventive approach eliminates the need for subsequent additional treatments, thereby maintaining fluid purity while avoiding the costs and energy consumption of remedial processing.
Data Source
AI summary
The present disclosure generally relates to a nozzle assembly, a polishing system, and a method for operating the polishing system. The nozzle assembly includes an upper manifold attached to a top surface of a platen and a lower manifold attached to a bottom surface of the platen. The upper manifold secures a slurry-collecting line having a slurry-collecting tube and a cleaning line having a cleaning tube. The cleaning line has a waste-collecting valve and a cleaning valve that are secured by the lower manifold. The polishing system includes a polishing platen to support a polishing pad; a gutter disposed around the polishing platen; and a slurry-collecting line comprising a slurry-collecting tube coupled with a slurry-collecting valve, the slurry-collecting tube extending into the gutter, the slurry-collecting line being configured to remove slurries out of the gutter in a slurry-collecting mode and dispense a flushing agent in a flushing mode.