Semiconductor Wafer Bowing for Rigidity and Density
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Solution Overview
Problem
Manufacturing solar cells and other semiconductor structures often 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 allow horizontal bowing, either before or during loading, to maintain the wafers' shape and prevent breakage, thereby enhancing processing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large and thin semiconductor wafers are used to increase wafer density, then productivity is improved, but the wafers become less rigid and more prone to breakage
Solution Approach 1:
The wafer is intentionally bowed before loading into the carrier. This preliminary deformation is applied to create a pre-stress state that will counteract the bending stresses encountered during subsequent processing operations, thereby preventing breakage while maintaining the large, thin dimensions needed for high wafer density
Solution Approach 2:
The mechanical state of the wafer is changed from flat to bowed, altering its stress distribution and rigidity characteristics. This parameter change in the wafer's geometric configuration allows thin wafers to maintain sufficient rigidity during processing without increasing their physical dimensions
2Reliability
If wafer rigidity is increased by bowing to prevent breakage, then reliability is improved, but device complexity increases due to additional bowing mechanisms
Solution Approach 1:
The wafer carrier incorporates sliding rods that allow dynamic adjustment of the wafer's bowed position. This dynamic mechanism enables the wafer to be properly positioned and secured in its bowed state, maintaining reliability while using a relatively simple mechanical implementation
Solution Approach 2:
The sliding rods act as intermediary elements between the wafer and the carrier structure. These rods facilitate the transfer and distribution of forces to maintain the wafer's bowed configuration without requiring complex constraint mechanisms, thereby improving reliability with minimal increase in device complexity
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 higher wafer density and improved processing efficiency without increasing physical footprint, reducing cross-slotting, and enhancing uniformity by maintaining wafer integrity and position control during semiconductor processing.
Implementation Method 1
intentionally bowing semiconductor wafers to increase their rigidity by using a wafer carrier with sliding rods that allow horizontal bowing
Data Source
AI summary
This specification describes 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.