Multiple Nozzle Slurry Dispensing for CMP Uniformity
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Solution Overview
Problem
Current slurry dispensing schemes for chemical mechanical polishing (CMP) processes face challenges in achieving uniformity and efficiency, leading to high costs due to excessive slurry usage and uneven removal rates.
Innovation Solution
A multiple nozzle slurry dispensing scheme is introduced, featuring a slurry dispensing arm with multiple nozzles that distribute slurry uniformly across the polishing pad, optimizing slurry flow and reducing waste by dispensing slurry from multiple nozzles positioned either facing down or upward, which are connected to a slurry supply module, allowing for efficient coverage and reduced consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single nozzle is used for slurry dispensing, then the device complexity is low, but the slurry distribution uniformity is poor and slurry consumption is high
Solution Approach 1:
The single nozzle is segmented into multiple nozzles (e.g., 3-5 nozzles) arranged in a specific pattern on the dispensing arm. Each nozzle delivers slurry to a different region of the polishing pad, collectively achieving uniform distribution across the entire pad surface. This segmentation directly resolves the contradiction by improving distribution uniformity while keeping each individual nozzle simple.
Solution Approach 2:
Multiple nozzle functions are merged into a single dispensing arm assembly, where all nozzles work together to achieve comprehensive slurry coverage. The merging of multiple spray functions into one integrated system improves uniformity without proportionally increasing overall system complexity, as the nozzles share common mounting and control infrastructure.
2Loss of substance
If a single nozzle is used for slurry dispensing, then the device structure is simple, but the slurry consumption is excessive
Solution Approach 1:
The slurry delivery function is segmented across multiple nozzles, each targeting a specific zone of the polishing pad. This segmentation enables precise local delivery, reducing slurry waste from overspray and ensuring slurry is applied only where needed. The cumulative effect of multiple targeted nozzles significantly reduces total slurry consumption compared to a single high-flow nozzle.
Solution Approach 2:
Each nozzle is positioned and oriented to deliver slurry to a specific local region of the polishing pad with appropriate flow rate and distribution pattern. This local optimization ensures that slurry is applied efficiently at each location, preventing both over-application and under-application, thereby reducing overall slurry consumption while maintaining effective polishing across the entire pad surface.
3Productivity
If multiple nozzles are used for slurry dispensing, then the slurry distribution uniformity is improved and slurry consumption is reduced, but the device complexity increases
Solution Approach 1:
The polishing pad surface is segmented into multiple zones, each served by a dedicated nozzle. This segmentation enables simultaneous slurry delivery to multiple regions, improving overall process efficiency and uniformity. The segmented approach achieves better productivity by parallelizing slurry distribution across the pad surface.
Solution Approach 2:
The multi-nozzle dispensing arm provides universal coverage of the entire polishing pad surface, with each nozzle contributing to the overall uniform distribution goal. The system achieves multi-functionality by simultaneously performing slurry delivery to multiple locations, condition monitoring, and flow rate control, thereby improving productivity without requiring separate systems for each function.
Data Source
AI summary
An apparatus includes a slurry dispensing arm, multiple nozzles formed on the slurry dispensing arm, and a slurry supply module connected to the slurry dispensing arm. The slurry supply module is configured to provide slurry to the multiple nozzles and the multiple nozzles are configured to dispense the slurry.