SiC Ring Tool Finishing for Wafer Chuck Surface Flatness
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Solution Overview
Problem
Existing deterministic techniques for finishing chuck surfaces, such as those used in semiconductor wafer handling, are inefficient due to fixed tool sizes that require extensive processing time over large substrates, especially when dealing with materials like SiC, where uniformity of lap conditions leads to non-uniformity and contamination issues.
Innovation Solution
A treatment tool with a contacting surface configured as a circle, ring, or annulus, made from silicon carbide, is used in a deterministic manner, allowing for localized correction of surface errors by moving the tool at controlled pressure over specific regions, and multiple tools can be used simultaneously with independent pressure control to cover larger areas efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed-size tool is used for deterministic finishing of large chuck surfaces, then the tool can maintain consistent contact pressure, but the processing time increases significantly and contamination risk increases
Solution Approach 1:
The patent divides the chuck surface into multiple zones or segments that are processed independently. The treatment tool moves to specific locations only when correction is needed, rather than processing the entire surface uniformly. This segmentation allows targeted finishing of high-error regions while skipping already-flat areas, dramatically reducing total processing time while maintaining precision requirements.
Solution Approach 2:
The patent applies different processing parameters or intensities to different locations on the chuck surface based on local error characteristics. The treatment tool adjusts its operation locally according to the measured surface figure data, applying correction only where and how much is needed at each specific location, rather than using a uniform approach across the entire surface.
2Manufacturing precision
If a treatment tool processes the entire chuck surface, then uniform flatness can be achieved, but processing time increases and contamination risk increases
Solution Approach 1:
The patent extracts or removes only the necessary processing actions from the overall process. Instead of treating the entire chuck surface, the system identifies and processes only the specific regions that require correction based on pre-measured surface figure data. This extraction of necessary-only processing minimizes the tool's contact time with the surface, reducing opportunities for contamination while achieving the required uniformity.
Solution Approach 2:
The patent applies partial action by processing only the portions of the surface that need correction rather than the entire surface. The deterministic approach calculates exactly which areas require material removal or adjustment, applying treatment selectively to those regions only, thereby minimizing exposure to contamination sources while achieving sufficient uniformity.
3Loss of time
If a smaller treatment tool is used for localized correction, then processing time decreases, but the tool size is fixed and cannot cover larger areas efficiently
Solution Approach 1:
The patent introduces dynamics to the tool system by allowing the treatment tool size or configuration to change adaptively. Rather than using a single fixed-size tool, the system can dynamically select from multiple tool sizes or configurations based on the specific requirements of different chuck surface regions. This dynamic adaptability allows efficient coverage of both small localized errors and larger area corrections without sacrificing the time-saving benefits of smaller tools.
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
This approach significantly reduces processing time by targeting only necessary areas for correction, improving surface flatness and reducing contamination, while maintaining precision and minimizing wear and friction, thus enhancing the lifespan and performance of chucking components.
Implementation Method 1
The treatment tool may have a contacting surface configured such that when this contacting or treatment surface is brought into contact with a flat surface, for example, of that of a wafer chuck, the area of contact may be in the form of a circle, ring, or annulus
Data Source
AI summary
In a deterministic setting for finishing the support surface of a chuck such as a wafer chuck, the treatment tool may have a contacting surface shaped as a ring, annulus, or toroid, or at least such will be the form of contact when the treatment tool is brought into contact with a flat surface. The treatment tool may have about the same hardness as the work piece (e.g., the wafer chuck) that is being finished. In one embodiment, the treatment tool, or at least the flat contacting surface, is made from silicon carbide (SiC), or contains SiC, for example, in the form of a composite material such as reaction-bonded SiC.