Wafer Transfer Blade Microstructure Support for Contamination Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wafer transfer processes in semiconductor manufacturing are prone to contamination, which can lead to defects in semiconductor devices due to contact with transfer apparatus components.
Innovation Solution
A wafer transfer apparatus with a minimum contact area (MCA) support and porous adsorption material is employed, featuring microstructures with a porous adsorption material between them to reduce contact area and adsorb specific gas elements, creating a depletion zone to minimize contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional wafer transfer apparatus with large contact area is used, then the wafer is securely supported during transfer, but contamination occurs due to increased contact area between the wafer and transfer apparatus components
Solution Approach 1:
The contact area between the wafer and MCA support is segmented into multiple discrete microstructures (microspheres, microcolumns, or microwells) rather than a continuous surface. This segmentation reduces the total contact area while maintaining adequate support points, thereby minimizing contamination risk while preserving wafer support stability during transfer operations.
Solution Approach 2:
The MCA support structure implements local quality by creating regions of different contact characteristics - the microstructures provide localized contact points with specific geometric properties (spherical, cylindrical, or well-shaped) that optimize both support stability and contamination reduction. The non-contact regions between microstructures minimize contamination while the distributed microstructure array maintains overall support reliability.
2Object-affected harmful factors
If porous adsorption material is added to create depletion zone, then gas element adsorption and contamination reduction are improved, but device complexity increases
Solution Approach 1:
A porous adsorption material layer is deposited over the microstructure array on the MCA support. This porous layer creates a depletion zone that adsorbs harmful gas elements (such as residual gases or volatile contaminants) from the surrounding environment, preventing them from reaching the wafer contact area. The porous structure provides high surface area for adsorption while maintaining compatibility with the microstructure geometry.
Solution Approach 2:
The MCA support structure combines multiple materials and functional layers - the base support material, the microstructure material (such as silicon or ceramic), and the porous adsorption material layer. This composite construction integrates mechanical support functionality with chemical adsorption functionality, achieving both structural stability and contamination prevention in a single integrated component.
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 reduces contamination by limiting contact area and adsorbing harmful gases, thereby enhancing the yield and quality of semiconductor devices.
Implementation Method 1
a porous adsorption material between the plurality of microstructures, the porous adsorption material having a level lower than that of the contact area
Data Source
AI summary
A wafer transfer apparatus includes a blade having a wafer accommodation area configured to support a wafer, a minimum contact area (MCA) support on the wafer accommodation area of the blade, a plurality of microstructures on an upper surface of the MCA support, each of the plurality of microstructures having an upper end configured to be a contact area for contacting the wafer, and a porous adsorption material between the plurality of microstructures, the porous adsorption material having a level lower than that of the contact area.