Wafer-Cell Traceability via Crystallographic Fingerprinting
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Solution Overview
Problem
Current methods for tracing solar cells back to their corresponding wafers are either surface-damaging, costly, or unsuitable for mass production, as they require adapting tracking systems to different equipment.
Innovation Solution
A method and system that utilize the unique crystallographic structure of each wafer and solar cell to establish correspondence through image comparison, without modifying the wafer surface or requiring extensive tracking system adaptations, using imaging devices and 'fingerprint matching' software to assign cell inspection data to wafer positions and adjust production parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wafer scribing/inking is used to mark wafer identification, then traceability is achieved, but wafer surface quality is reduced
Solution Approach 1:
The patent uses optical imaging to create a digital copy of the wafer's crystallographic structure, which serves as a unique identifier. Instead of physically marking the wafer, the system captures an optical image that replicates the wafer's natural crystal pattern, thereby achieving traceability without compromising surface quality
Solution Approach 2:
The patent replaces mechanical marking methods (scribing/inking) with an optical imaging system. The crystallographic structure is captured using optical devices, and the resulting digital image is used for identification, eliminating the need for physical contact with the wafer surface that would degrade its quality
2Reliability
If advanced data tracking systems are implemented to follow wafers through production, then traceability is achieved, but system complexity and cost increase
Solution Approach 1:
The system creates a digital replica of the wafer's crystallographic structure that can be stored and compared throughout the production process. This digital copy replaces complex physical tracking infrastructure, as the unique crystal pattern serves as an inherent identifier that follows the wafer through all manufacturing stages
Solution Approach 2:
The wafer's own crystallographic structure serves as its unique identifier, eliminating the need for external tracking tags or markers. The natural crystal pattern inherent to each wafer is captured and used for identification, making the tracking system self-service rather than requiring additional complex infrastructure
3Reliability
If small cuts are performed on the wafer for identification, then traceability is achieved, but breakage ratio increases
Solution Approach 1:
The patent creates a digital image copy of the wafer's surface pattern rather than physically altering the wafer. The optical imaging captures the crystallographic structure, and this digital replica is used for identification, completely avoiding physical cuts that would weaken the wafer
Solution Approach 2:
The patent replaces mechanical cutting methods with optical imaging. Instead of using physical tools to mark or cut the wafer, the system uses light to capture an image of the crystallographic structure, thereby achieving identification without any mechanical intervention that could cause breakage
Data Source
AI summary
The invention regards a method and a system for establishing correspondence between wafers and solar cells produced from said wafers. The method comprises for each wafer and each solar cell, providing an image of the wafer, providing an image of the cell, comparing the wafer image to the cell image, upon match between a cell image and a wafer image, assigning the current cell to the current wafer. The system comprises at least one imaging device for providing images of the wafers and the cells, a processing unit for comparing a wafer image to a cell image, and upon match between a cell image and a wafer image, assigning the current cell to the current wafer, and a memory unit.