Silicon Wafer Separation Using Suction and Fluid Jets
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Solution Overview
Problem
The existing methods for separating silicon wafers from a horizontal stack are inefficient, prone to wafer damage, and require manual handling, which is labor-intensive and limits processing speed, especially for thin solar cell wafers that require delicate handling.
Innovation Solution
A method and device that attach a movable transport device to the outermost silicon wafer and move it in a substantially vertical plane to separate it from the stack, using a combination of suction devices and fluid jets to overcome capillary and adhesive forces, with the option to move in various paths and submerged in a liquid-filled vessel to minimize mechanical stress and enhance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual separation of silicon wafers is performed, then flexibility and control are maintained, but labor intensity increases and processing speed is limited
Solution Approach 1:
The system uses sensors to automatically detect wafer position and conditions, with the control unit autonomously determining separation timing and parameters, enabling the system to serve itself without continuous manual intervention while maintaining adaptive control
Solution Approach 2:
The separation force is dynamically adjusted based on real-time feedback from sensors detecting wafer position, stack depth, and separation progress, allowing the system to adapt to varying conditions while operating automatically
2Ease of operation
If manual separation of silicon wafers is performed, then handling flexibility is maintained, but wafer damage rate increases due to work-intensive operations
Solution Approach 1:
The system replaces manual mechanical handling with an automated mechanical arm that uses controlled suction forces through adaptors, eliminating the variability and excessive force associated with manual handling while maintaining gentle, precise control
Solution Approach 2:
Sensors continuously monitor wafer position, attachment status, and separation forces, providing real-time feedback to the control unit which adjusts the separation parameters to prevent excessive force application that could damage fragile thin wafers
3Productivity
If separation force is increased to overcome capillary forces between wafers, then separation speed improves, but wafer deformation and breakage risk increases
Solution Approach 1:
The separation force is not applied statically but dynamically adjusted during the separation process based on sensor feedback indicating wafer response, allowing the system to overcome capillary forces progressively without applying excessive peak forces that would cause deformation
Solution Approach 2:
The system changes the separation approach by using controlled suction force parameters applied through adaptors at specific locations, rather than direct mechanical pushing or pulling, enabling separation at lower force levels by exploiting pressure differential mechanics
4Productivity
If thin wafer thickness (100μm - 200μm) is used to reduce cost, then manufacturing efficiency improves, but handling requirements become more stringent and damage risk increases
Solution Approach 1:
Manual mechanical handling is replaced with an automated system using suction-based adaptors that distribute force across larger surface areas, reducing point-load stress on thin wafers while enabling consistent, repeatable handling that thin wafers require
Solution Approach 2:
The system autonomously adjusts handling parameters based on real-time sensor data about wafer thickness and condition, enabling the system to self-optimize for the specific vulnerabilities of thin wafers without requiring manual intervention or knowledge of wafer specifications
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 allows for a controlled, efficient, and gentle separation of silicon wafers, reducing the risk of damage and enabling faster processing while maintaining wafer integrity, particularly for thin solar cell wafers.
Implementation Method 1
The wafers are held together by a force which is determined by cohesive, adhesive and viscous properties in the medium between the wafers
Implementation Method 2
The wafers are held together by a force which is determined by cohesive, adhesive and viscous properties in the medium between the wafers
Implementation Method 3
a fluid is blown in between the top silicon wafer and the second top silicon wafer in order to help them to be separated from each other
Data Source
Figure 1
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Figure 4
AI summary
The invention relates to a method for separation of a silicon wafer (12a) from a vertical stack (10) of silicon wafers (12). The method is characterised in that it comprises attaching a movable transport device (2) to a surface of the silicon wafer (12a) in the stack (10), and horizontal movement of the silicon wafer (12a) parallel (A) to the surface of the silicon wafer (12a) until the silicon wafer (12a) is separated from the stack (10). The invention also comprises a device for implementing the method.