Vacuum Processing Apparatus Linear Tool Wafer Transfer Optimization
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Solution Overview
Problem
Conventional transferring methods for semiconductor wafers in linear tool configurations are inefficient due to their design features, which differ from those of cluster tools, leading to suboptimal processing and throughput in semiconductor processing apparatuses.
Innovation Solution
A method that calculates and optimizes the number of transferring operations between transport chambers and process chambers, prioritizing operations to reduce robot standby periods and increase efficiency by allocating wafers to process chambers based on distance from the load lock and using controlling rules for odd or even numbers of buffer room transfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transferring methods are used in linear tool configuration, then the apparatus can process wafers, but the transferring efficiency is low due to robot standby periods
Solution Approach 1:
The control unit calculates and determines the destination of each wafer in advance before the transferring operation begins. By pre-determining which process chamber each wafer should be transferred to, the system eliminates idle decision-making time and robot standby periods during actual transferring operations, thereby improving transferring efficiency
Solution Approach 2:
The control unit continuously monitors the status of transport chambers, process chambers, and robots, and dynamically adjusts wafer allocation and transferring schedules based on real-time feedback. This ensures optimal utilization of resources and minimizes robot standby periods by responding adaptively to changing conditions
2Adaptability or versatility
If different kinds of wafers are parallelly processed, then versatility is improved, but transferring complexity increases
Solution Approach 1:
The control unit segments wafer types and processing routes into distinct groups, managing each group with optimized transferring patterns. This segmentation approach allows the system to handle multiple wafer types in parallel while maintaining simplicity within each segment, reducing overall transferring complexity
Data Source
AI summary
Provided is a method for controlling efficient transferring operations in a vacuum processing apparatus with a linear tool. In the apparatus, plural transferring robots are arranged in transferring mechanism units in which plural process chambers are connected with each other, and to-be-processed wafers are received and passed between plural transferring robots. As the transferring robots is far from the load lock, the number of transferring operations to the process chambers is set larger, the number of times of continuous transferring operations to the process chambers is set as small as possible, and an odd number of times of continuous transferring operations to buffer rooms is set, by a destination determination unit and operation control rules. Further, transferring operations are performed based on the destination determination unit and the operation control rules.