Substrate Handling Contact Structures for Scratch-Free Wafer Transfer
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Solution Overview
Problem
In integrated circuit (IC) manufacturing, existing substrate handling devices often cause scratching or damage to substrates due to mismatched hardness between the handling devices and the substrates, leading to potential circuit damage and contamination from released particles.
Innovation Solution
The substrate handling device features contact structures made of materials with hardness aligned to the substrate material, using a Mohs hardness scale to match the contact material's hardness within a specific range of the substrate's, and incorporates surface patterns to increase the coefficient of static friction, reducing damage and slippage during handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact structures are made of harder materials to prevent substrate damage, then substrate protection is improved, but the handling device itself becomes more susceptible to damage from substrate particles
Solution Approach 1:
The patent applies parameter changes by carefully selecting the hardness parameter of contact structure materials to fall within a specific range (Mohs hardness 2-7) that balances substrate protection with device durability. This optimal parameter selection prevents both substrate damage and excessive wear on the handling device.
Solution Approach 2:
The patent employs composite materials by combining different material properties in the contact structures. The contact structures are made from materials exhibiting specific combinations of hardness, elasticity, and friction coefficients, creating a composite solution that simultaneously achieves substrate protection and device durability.
2Manufacturing precision
If contact material hardness is increased to reduce substrate scratching, then substrate integrity is improved, but particle release from the handling device increases
Solution Approach 1:
The patent applies parameter changes by optimizing the hardness parameter within a specific range (Mohs 2-7) rather than using maximally hard materials. This controlled parameter selection prevents substrate scratching while avoiding the particle release associated with overly hard materials.
Solution Approach 2:
The patent applies local quality by tailoring the material properties of contact structures to specific operational requirements. Different contact structures may use materials with different hardness levels within the recommended range, optimizing local interactions between the handling device and substrate to prevent both damage and particle generation.
3Duration of action of stationary object
If contact structures use softer materials to prevent device damage, then device durability is improved, but substrate scratching increases
Solution Approach 1:
The patent applies parameter changes by establishing an optimal hardness range (Mohs 2-7) for contact structure materials. This parameter optimization ensures the materials are soft enough to prevent device damage yet hard enough to protect substrates, resolving the contradiction between device durability and substrate protection.
4Ease of manufacture
If material hardness is mismatched between handling devices and substrates, then device manufacturing is simpler, but substrate damage and circuit compromise increase
Solution Approach 1:
The patent applies parameter changes by specifying a hardness parameter range (Mohs 2-7) for contact structure materials that aligns with substrate material properties. This parameter matching ensures substrate protection and circuit functionality while maintaining practical manufacturability of the handling devices.
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 minimizes substrate and handling device damage, reduces the risk of circuit compromise from impurities, and extends the useful lifetime of handling devices by ensuring proper contact and reduced abrasion.
Implementation Method 1
Each contact structure of the plurality of contact structures includes a material having a hardness aligned to a hardness of a substrate material
Implementation Method 2
incorporates surface patterns to increase the coefficient of static friction, reducing damage and slippage during handling
Data Source
AI summary
A substrate handling device includes a substrate reception area defined by an edge. The substrate reception area includes a planar surface, wherein the edge extends upward from the planar surface. The substrate reception area further includes a plurality of contact structures extending upwards from the planar surface, wherein a first contact structure of the plurality of contact structures directly contacts a side surface of the edge, a second contact structure of the plurality of contact structures separated from the edge, a shape of the first contact structure is different from a shape of the second contact structure. The substrate reception area and the planar surface include a first material. Each contact structure of the plurality of contact structures includes a second material different from the first material, and the second material has a hardness aligned to a hardness of a substrate material.