Edge Ring RFID Tracking for Carrier Slot Verification
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Solution Overview
Problem
Current semiconductor wafer processing systems lack an efficient method to track and verify the correct consumable parts, such as edge rings, leading to potential loading errors and wafer scrap events due to the inability to distinguish between different types of edge rings, especially when they are mixed in carriers.
Innovation Solution
Implementing a system that tracks edge rings throughout their lifetime using identifiers and sensors to build metadata files, ensuring correct edge rings are delivered to the appropriate process modules by linking edge ring identifiers to carrier identifiers and slot numbers, and updating information in real-time as they move through the fabrication facility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If edge rings are mixed in carriers for storage and transport, then carrier space utilization is improved, but the ability to distinguish and verify correct edge rings deteriorates
Solution Approach 1:
The patent extracts the identification function from the physical appearance of edge rings and embeds it in RFID tags attached to each edge ring. This allows edge rings to be stored mixed in carriers while their identities are separately captured and tracked through the RFID reading system, resolving the contradiction between mixed storage and identification.
Solution Approach 2:
The patent introduces RFID tags as an intermediary between the edge ring and the tracking system. The RFID tag carries the identification information that would otherwise be lost in mixed storage, enabling verification without requiring visual distinction among edge rings in the carrier.
2Measurement precision
If manual verification of edge rings is performed, then identification accuracy is improved, but labor time and operational complexity increase
Solution Approach 1:
The system enables self-service verification where the RFID reading system automatically captures and verifies edge ring identifiers without requiring manual inspection. The system itself performs the verification function that would otherwise require human operators, improving both accuracy and operational simplicity.
Solution Approach 2:
The patent replaces the manual mechanical verification process with an automated RFID reading system. The electromagnetic field-based RFID technology substitutes for human visual inspection and manual checking, providing automated verification that is both more accurate and easier to operate.
3Productivity
If automated RFID reading is implemented at carrier level, then tracking efficiency is improved, but system complexity and cost increase
Solution Approach 1:
The patent segments the tracking system into two levels: carrier-level RFID reading for efficient bulk tracking and individual edge ring RFID tags for detailed identification. This segmentation allows automated tracking without requiring complex individual verification of each edge ring, balancing efficiency and complexity.
Solution Approach 2:
The RFID reading system serves multiple functions: it identifies the carrier, verifies edge ring identifiers, tracks location, and monitors usage. This multi-functionality reduces the need for separate systems for each tracking task, thereby improving efficiency without proportionally increasing complexity.
Data Source
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AI summary
Methods and systems for tracking an edge ring includes capturing an edge ring identifier from a source related to the edge ring. The edge ring is inserted into a slot of an edge ring carrier, wherein the edge ring is being assigned to the edge ring carrier. The edge ring identifier is tracked to determine transfers into and out of the edge ring carrier and into and out of a processing station. The tracking of the edge ring identifier builds a metadata file that provides lifetime information regarding the edge ring.