Linear Wafer Transport System with Segmented Vacuum Chambers
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Solution Overview
Problem
Current semiconductor wafer processing systems face challenges in maintaining high throughput and cost-effectiveness due to their large footprint and lack of redundancy, which limits processing flexibility and increases costs, especially when one processing station is down for maintenance.
Innovation Solution
A novel wafer processing system with a linear arrangement of processing chambers and a modular design, utilizing a linkage arm system for independent wafer transport that allows for separately controlled dwell times at each station, enabling continuous operation even if one station is unavailable, and allowing for easy expansion without increasing the system's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional circular cluster tool with central chamber is used, then wafers can be processed through multiple chambers, but the system occupies a large footprint area
Solution Approach 1:
The system is divided into separate processing chambers that can be independently controlled and accessed. Each chamber operates autonomously with its own vacuum environment, allowing the transport chamber to remain at a different pressure. This segmentation enables a linear compact layout instead of a large circular arrangement, reducing footprint while maintaining multi-chamber processing capability.
Solution Approach 2:
The patent transitions from a two-dimensional circular layout to a three-dimensional linear arrangement with vertical stacking possibilities. The linear transport chamber allows chambers to be arranged in a compact line, utilizing space more efficiently and reducing the overall footprint area while maintaining access to multiple processing stations.
2Reliability
If processing chambers are sealed off from the central chamber, then contamination is prevented, but the system lacks redundancy and stops operating when one chamber is down for maintenance
Solution Approach 1:
Each processing chamber is completely sealed and isolated from the transport chamber, creating independent vacuum environments. This segmentation means that maintenance or failures in one chamber do not affect others, providing redundancy. The transport chamber can continue moving wafers through operational chambers while non-operational chambers are serviced, maintaining system availability and flexibility.
Solution Approach 2:
The transport chamber acts as an intermediary that connects all processing chambers without being part of their sealed vacuum environments. It serves as a mediator that can transport wafers to and from any chamber independently, allowing maintenance operations in one chamber without disrupting the transport function or other chambers, thus maintaining system flexibility and availability.
3Productivity
If wafers are moved sequentially through chambers one at a time, then processing is performed in order, but throughput is reduced compared to simultaneous processing
Solution Approach 1:
Multiple wafers are loaded into the transport chamber in advance before entering the processing chambers. The transport chamber can hold and position multiple wafers simultaneously, allowing them to be sequentially presented to processing chambers without waiting for previous wafers to complete all steps. This preliminary loading increases throughput while keeping the system relatively simple compared to fully parallel processing systems.
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 solution achieves high throughput with a small footprint, maintains system availability during maintenance, and simplifies robotics and service operations, reducing costs and improving processing efficiency by allowing all processes to continue uninterrupted.
Implementation Method 1
a rotary motor mounted onto the second base and rotating a magnetic driver, the magnetic driver imparting a rotational motion to the magnetically-coupled follower across a vacuum partition
Implementation Method 2
a speed reducer mounted onto the first base and having a magnetically-coupled follower as its input and providing a lower rotational speed at its output
Data Source
AI summary
There is described apparatus and methods for transporting and processing substrates including wafers as to efficiently produce at reasonable costs improved throughput as compared to systems in use today. A key element is the use of a transport chamber along the sides of processing chambers for feeding substrates into a controlled atmosphere through a load lock and then along a transport chamber as a way of reaching processing chambers and then out of the controlled atmosphere following processing in the processing chambers.