Forked Substrate Handling Apparatus for Warped Wafers
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Solution Overview
Problem
Existing wafer handling methods are inadequate for handling warped substrates of various shapes and sizes, leading to unstable handling and low throughput.
Innovation Solution
A substrate handling apparatus featuring a forked structure with active and passive support elements, including suction cups and vacuum channels, that securely grips substrates at multiple points to accommodate warped and irregular shapes, enhancing handling stability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the edge-contact handling method is used, then the wafer can be handled, but it cannot handle a range of sample substrate thicknesses resulting in unstable handling
Solution Approach 1:
The handling system is segmented into multiple independent vacuum suction cups positioned at different locations (center and edge regions) of the substrate. This segmentation allows each suction cup to independently contact the substrate surface, accommodating variations in substrate thickness and warpage while maintaining stable handling through distributed contact points.
2Reliability
If the 3X vacuum suction cup method is used, then the wafer can be held, but it is ineffective in handling various wafer shapes including warped wafers
Solution Approach 1:
The handling approach transitions from a single-plane contact method to a multi-dimensional contact system. Vacuum suction cups are positioned at different spatial locations (center and peripheral regions) and can contact the warped substrate at different heights, effectively handling various wafer shapes by utilizing three-dimensional contact points rather than a single plane.
3Ease of operation
If the gravity method is used, then the wafer can be handled, but handling tools cannot move at high speeds resulting in low throughput
Solution Approach 1:
The system replaces gravity-based handling with pneumatic vacuum suction technology. Multiple vacuum suction cups create strong adhesive forces to hold the substrate, enabling high-speed movement and rapid acceleration/deceleration without relying on gravity. This pneumatic approach significantly increases throughput while maintaining ease of operation through controlled vacuum activation and deactivation.
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 apparatus effectively handles substrates of all shapes and sizes, including warped ones, by creating a third passive point of contact, thereby reducing contamination and increasing throughput.
Implementation Method 1
the 3X vacuum suction cup method
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A substrate handling apparatus is provided. The substrate handling apparatus may include a forked structure with one or more support portions which are arranged to provide access to a back surface of a substrate. The substrate handling apparatus may also include a first active support element and a second active support element configured to couple the substrate handling apparatus to the back surface of the substrate. After being placed on the first active support element and the second active support element, the substrate may tilt or lean to create at least a third, passive point of contact along the forked structure. The creation of at least a third, passive point of contact may increase substrate handling and control capabilities with warped substrates.