Workpiece Support Unit With Segmented Adhesion
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Solution Overview
Problem
Conventional workpiece support systems struggle with removing wafers from carriers due to strong adhesion and carrier stiffness, leading to potential damage like cracks or breakage, and require residue removal for reuse, which can affect processing results.
Innovation Solution
A workpiece support unit is provided with a carrier, a protective sheeting, and an intermediate layer arranged on the carrier such that the attachment force between the protective sheeting and the carrier is greater in the peripheral region than in the center region, facilitating easy removal of the protective sheeting and preventing adhesive issues during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to fix the wafer to the carrier, then the wafer is securely held during processing, but the wafer becomes difficult to remove and may be damaged
Solution Approach 1:
The patent divides the attachment mechanism into two distinct segments: adhesive for strong initial fixation and intermediate layer for controlled release. The intermediate layer is positioned between the protective sheeting and carrier, creating a segmented structure where each layer serves a different function in the attachment-detachment cycle.
Solution Approach 2:
The intermediate layer acts as a mediator between the protective sheeting and the carrier. It has specific properties that allow it to facilitate easy removal of the protective sheeting while not interfering with the adhesive's ability to securely hold the wafer to the carrier during processing.
2Strength
If the carrier has a larger diameter than the wafer to support the edge, then edge support is improved, but adhesive accumulates on the circumferential surface causing processing defects
Solution Approach 1:
The patent extracts the adhesive from the circumferential region by positioning it only in the central region of the carrier. This eliminates the harmful effect of adhesive accumulation on the wafer's circumferential surface while preserving the mechanical support function of the carrier's larger diameter.
Solution Approach 2:
The patent applies different properties to different regions of the carrier: the central region has adhesive for secure attachment, while the peripheral region has no adhesive to prevent contamination. This local differentiation of properties solves the contradiction between edge support and contamination prevention.
3Stability of the object's composition
If strong adhesive is used to ensure wafer stability, then processing stability is improved, but carrier reuse requires residue removal affecting efficiency
Solution Approach 1:
The patent makes the protective sheeting with intermediate layer a disposable component that is easily removed and discarded after use. This allows the expensive carrier to be reused without time-consuming residue removal, as the adhesive remains on the carrier substrate and does not transfer to the protective sheeting during removal.
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 allows for the reliable fixation and support of workpieces without adhesives, preventing damage during removal and simplifying the reuse of carriers by eliminating the need for residue removal, thus enhancing processing efficiency and reducing the risk of contamination.
Implementation Method 1
an attachment force between said protective sheeting and said carrier is greater in a peripheral region of the first side of the carrier than in a center region of the first side of the carrier
Data Source
AI summary
The present disclosure describes a method of providing a workpiece support unit for supporting a workpiece. The method comprises the steps of providing a carrier having a first side and a second side opposite to the first side, providing a protective sheeting, and providing an intermediate layer. The method also comprises the step of arranging the protective sheeting and the intermediate layer on the first side of the carrier by at least partially interposing the intermediate layer between the protective sheeting and the carrier so that an attachment force between said protective sheeting and said carrier is greater in a peripheral region of the first side of the carrier than in a center region of the first side of the carrier. The disclosure also proposes a workpiece support unit.