Bowed Wafer Carrier Loading for Large Thin Semiconductor Wafers
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Solution Overview
Problem
Manufacturing solar cells and other semiconductor structures face challenges with the rigidity of large and thin wafers, which can lead to breakage during processing, limiting wafer density and processing throughput.
Innovation Solution
The method involves intentionally bowing semiconductor wafers to increase their rigidity by using a wafer carrier with sliding rods that horizontally bow the wafers, allowing for higher density loading and processing without breaking, and utilizing an automation system to pre-bow wafers before loading for enhanced control and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If large and thin semiconductor wafers are used to increase manufacturing capacity, then wafer area and potential output increase, but wafer rigidity decreases leading to breakage during processing
Solution Approach 1:
The patent applies curvature by intentionally bowing the semiconductor wafers into an arc shape during processing. This curvature transforms the flat wafer surface into a bowed configuration, which increases the wafer's resistance to breaking forces while maintaining the large area needed for high-capacity manufacturing. The bowed shape distributes mechanical stress more effectively across the wafer structure.
2Productivity
If wafer density in carrier is increased to improve throughput, then processing efficiency increases, but wafer rigidity decreases increasing breakage risk
Solution Approach 1:
The patent implements curvature at the wafer level by bowing each wafer individually, allowing high-density carrier loading without compromising structural integrity. The bowed shape provides inherent mechanical reinforcement that enables tighter packing in carriers while maintaining resistance to breaking forces during high-speed processing operations.
3Productivity
If process parameters are increased to enhance manufacturing efficiency, then production speed increases, but wafer breakage risk increases due to reduced rigidity
Solution Approach 1:
The patent uses wafer bowing to create a curved configuration that inherently resists breaking forces, enabling manufacturers to operate at higher process parameters and speeds. The bowed shape acts as a structural reinforcement that allows aggressive processing conditions without proportionally increasing breakage risk, thus decoupling manufacturing efficiency from reliability concerns.
4Device complexity
If standard flat wafer loading is used to simplify carrier design, then device complexity is reduced, but wafer uniformity and rigidity during processing deteriorate
Solution Approach 1:
The patent implements a relatively simple carrier design with basic rod structures that induce wafer bowing through straightforward mechanical contact. The curvature is achieved through simple arc-shaped support surfaces and rod configurations, avoiding complex active control mechanisms while still providing the rigidity and uniformity benefits of bowed wafers during processing.
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 enhances the rigidity of wafers, enabling higher density wafer loading, increased processing throughput, and improved uniformity by reducing cross-slotting and allowing for increased process parameters without wafer breakage.
Implementation Method 1
horizontally bowing the semiconductor wafers using a wafer carrier with sliding rods
Implementation Method 2
utilizing an automation system to pre-bow wafers before loading for enhanced control and uniformity
Data Source
AI summary
Methods for processing semiconductor wafers, methods for loading semiconductor wafers into wafer carriers, and semiconductor wafer carriers. The methods and wafer carriers can be used for increasing the rigidity of wafers, e.g., large and thin wafers, by intentionally bowing the wafers to an extent that does not break the wafers. In some examples, a method for processing semiconductor wafers includes loading each semiconductor wafer into a respective semiconductor wafer slot of a semiconductor wafer carrier, horizontally bowing each semiconductor wafer, and moving the semiconductor wafer carrier into a processing station and processing the semiconductor wafers at the processing station while the semiconductor wafers are loaded into the semiconductor wafer carrier and horizontally bowed.