Replaceable Synthetic Inlay Chuck for Planarization Precision
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Solution Overview
Problem
Conventional self-planarization processes for semiconductor wafers are limited in precision due to material variations, leading to significant thickness deviations in integrated circuits, which are costly and time-consuming to correct, and require frequent chuck replacements, resulting in particle contamination and vacuum errors.
Innovation Solution
A workpiece planarization arrangement featuring a chuck with a replaceable synthetic material inlay, allowing for self-planarization under the same conditions as the workpieces, reducing thermal and mechanical differences, and enabling more frequent and cost-effective planarization with improved thickness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional self-planarization process is used, then chuck can be adjusted to plane, but precision is limited due to material variations leading to thickness deviations of more than 2 μm
Solution Approach 1:
The patent changes the material parameter of the chuck from conventional materials to synthetic material (such as polyetheretherketone or polytetrafluoroethylene), which has properties closer to the workpiece material. This parameter change enables the chuck to be planarized under the same conditions as the workpiece, achieving total thickness variation of less than 0.2 μm and eliminating the precision limitations of conventional self-planarization processes.
2Manufacturing precision
If frequent chuck replacements are performed for maintenance, then planarization quality can be maintained, but particle contamination and vacuum errors increase
Solution Approach 1:
The patent employs a replaceable synthetic material inlay that can be easily replaced when worn. This disposable-like component approach allows maintenance without frequent replacement of the entire chuck, reducing particle contamination from frequent installations while maintaining planarization quality through regular replacement of the consumable inlay component.
3Strength
If conventional chuck material is used, then structural strength is sufficient, but thermal and mechanical differences from workpiece material cause planarization inaccuracies
Solution Approach 1:
The patent uses a composite structure where the chuck body provides structural strength while a synthetic material inlay (such as polyetheretherketone or polytetrafluoroethylene) provides material properties similar to the workpiece. This composite approach combines the strength of conventional materials with the planarization benefits of synthetic materials, eliminating thermal and mechanical differences that cause inaccuracies.
4Ease of operation
If self-planarization is performed under different conditions than workpiece planarization, then chuck can be adjusted, but thermal and mechanical differences reduce reproducibility
Solution Approach 1:
The patent changes the chuck material parameters to match the workpiece material properties, enabling both the chuck and workpiece to be planarized under identical conditions. This parameter alignment ensures that thermal and mechanical conditions remain consistent between chuck adjustment and workpiece processing, achieving total thickness variation of less than 0.2 μm and significantly improving reproducibility.
Data Source
AI summary
According to various embodiments, a workpiece planarization arrangement may include: a chuck including a support carrier; and a workpiece-support replaceably mounted on the support carrier; and a planarization tool configured to planarize the at least one portion of the workpiece-support and to planarize one or more workpieces on the at least one portion of the workpiece-support.