Scalable Wafer Stocker With IO Buffer for Continuous Flow
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Solution Overview
Problem
In semiconductor manufacturing, the uneven flow of workpieces between processing steps and tools leads to accumulation, causing inefficiencies due to the slow response of traditional stocker systems and the need for manual handling, which disrupts the continuous flow of materials.
Innovation Solution
The implementation of an IO buffer system that pre-assembles wafer carriers for fast access and independent operation, allowing continuous facility flow even when the stocker is inoperative, combined with a scalable stocker configuration using 2D linear arrays and a center linear robot for efficient storage and handling of workpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional stocker systems are used to store workpieces, then workpieces can be stored, but the slow response time causes accumulation and disrupts continuous material flow
Solution Approach 1:
The IO buffer pre-assembles wafer carriers in advance and positions them for rapid access. When workpieces need to be stored or retrieved, pre-prepared carriers are immediately available, eliminating the time-consuming process of assembling carriers on-demand and ensuring continuous material flow without disruption
2Productivity
If manual handling is used to manage workpiece accumulation, then workpieces can be moved between tools, but manual intervention disrupts continuous flow and reduces efficiency
Solution Approach 1:
The IO buffer system operates autonomously to manage workpiece accumulation. The buffer automatically receives, stores, and dispenses workpieces based on real-time facility needs, eliminating the requirement for manual intervention and maintaining continuous automated material flow between processing tools
3Reliability
If the stocker is inoperative, then maintenance or repairs are needed, but this stops the continuous flow of materials
Solution Approach 1:
The IO buffer serves as an intermediary between the stocker and the rest of the facility. When the stocker is inoperative, the buffer continues to receive workpieces from processing tools and hold them, preventing disruption to facility flow. The buffer acts as a buffer zone that decouples the stocker operation from the overall facility continuity
Data Source
AI summary
Scalable storage can be achieved with linear array storage of wafers, comprising two linear arrays of storage compartments on opposite walls, with a middle transfer mechanism. Together with a buffer station for automatic material handling system, a scalable bare wafer stocker can provide flexible and uninterrupted services to a fabrication facility.