EFEM Load/Unload Robot With Vertically Offset Blades
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Solution Overview
Problem
Existing equipment front end modules (EFEMs) in semiconductor manufacturing face substrate throughput limitations due to inefficient transfer processes between substrate carriers and processing chambers.
Innovation Solution
The EFEM design includes a load/unload robot with multiple blades that can simultaneously transfer substrates between load ports and alignment pedestals, allowing for improved throughput by positioning substrates vertically or horizontally offset, enabling simultaneous alignment and transfer of multiple substrates to load locks or process chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single blade robot is used to transfer substrates, then the device complexity is low, but the substrate throughput is limited
Solution Approach 1:
The robot is divided into multiple independent blades (first blade, second blade, third blade, fourth blade) that can operate simultaneously. Each blade is equipped with its own end effector and can transfer substrates independently, transforming a single-unit system into a multi-unit parallel system to increase throughput.
Solution Approach 2:
Multiple blades are integrated into a single robot structure that shares common support mechanisms, control systems, and chamber access points. This merging allows the system to achieve high throughput while avoiding the complexity of completely separate robot systems.
2Loss of time
If substrates are transferred sequentially, then the device complexity is low, but the processing time increases
Solution Approach 1:
The multiple blades operate simultaneously and continuously to transfer substrates from load ports to alignment pedestals. While one blade is transferring a substrate, other blades are already positioned or transferring other substrates, eliminating idle time and maintaining continuous productive action throughout the system.
Solution Approach 2:
The blades are pre-positioned at optimal locations around the chamber, and end effectors are pre-configured to engage with substrates. This preliminary positioning allows immediate transfer operations to begin when substrates become available, reducing waiting time and improving throughput.
3Productivity
If multiple alignment pedestals are added, then the substrate throughput is improved, but the device complexity increases
Solution Approach 1:
Multiple alignment pedestals are designed with identical or similar structures that perform the same alignment function. This standardization allows the system to handle multiple substrates simultaneously while maintaining manageable complexity through modular, interchangeable components rather than unique custom-designed elements.
Data Source
AI summary
A system includes an equipment front end module chamber, alignment pedestals housed within the equipment front end module chamber, and a load/unload robot at least partially housed within the equipment front end module chamber. The alignment pedestals include a first alignment pedestal having a first support surface and a second alignment pedestal having a second support surface, and the first support surface has a vertical offset and an overlap region having at least a partial overlap relative to the second support surface. The load/unload robot includes an arm, and vertically arranged blades attached to the arm. The vertically arranged blades include an upper blade configured to transfer a first substrate to the first alignment pedestal and a lower blade configured to transfer a second substrate to the second alignment pedestal.