Overhead FOUP Storage Layout for Multi-Substrate EFEM Throughput
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Solution Overview
Problem
Conventional substrate processing tools for semiconductor integrated circuit fabrication lack efficient storage and automated processing capabilities for multiple types of substrates, limiting throughput and requiring multiple tools or a single linear robot.
Innovation Solution
A multi-chamber processing tool with an equipment front end module (EFEM) featuring overhead storage units and transport systems, including vertical and horizontal actuators, to manage and transport front opening unified pods (FOUPs) of varying sizes, enabling simultaneous processing of different substrate types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional processing tools with multiple tools or single linear robot are used, then substrate processing can be performed, but storage capacity and automated processing capability for multiple substrate types are limited
Solution Approach 1:
The patent combines multiple substrate processing functions (loading, storage, transport, and processing of different substrate types) into a single integrated tool. The equipment front end module includes overhead storage units that can hold multiple types of substrates simultaneously, and a transport system that automatically moves different substrate types to appropriate processing chambers, eliminating the need for multiple separate tools.
Solution Approach 2:
The processing tool is designed with universal capabilities to handle multiple substrate types through configurable overhead storage units and a adaptable transport system. The system can accommodate different substrate formats (wafer, tape, panel) and routing configurations, allowing a single tool to perform multiple substrate processing functions that previously required separate specialized tools.
2Quantity of substance
If overhead storage units with multiple shelves are used, then storage capacity for multiple substrate types is increased, but the space requirement and structural complexity increase
Solution Approach 1:
The patent transitions from horizontal storage arrangements to vertical overhead storage units with multiple shelves stacked above the processing chambers. This three-dimensional configuration allows the system to store multiple substrate types vertically, significantly increasing storage capacity without proportionally increasing the floor space occupied by the equipment.
Solution Approach 2:
The overhead storage unit is designed with nested or stacked shelves that efficiently utilize vertical space. Multiple storage levels are arranged compactly above the processing chambers, allowing the system to maximize substrate storage capacity within the existing equipment footprint without requiring additional floor space.
3Productivity
If automated overhead transport system with actuators is implemented, then substrate handling efficiency is improved, but the device complexity and cost increase
Solution Approach 1:
The transport system is designed to automatically move substrates from the overhead storage units to the appropriate processing chambers without manual intervention. The actuators and transport mechanisms operate autonomously under system control, enabling continuous automated substrate handling and processing, which improves throughput while reducing the need for operator involvement.
4Adaptability or versatility
If multiple loadports for different substrate types are provided, then versatility of substrate acceptance is improved, but the equipment size and complexity increase
Solution Approach 1:
The equipment front end module incorporates multiple loadports that can accommodate different substrate types (wafer, tape, panel) within a single integrated structure. Each loadport is equipped with appropriate receiving mechanisms, and the overhead storage and transport system can route different substrate types to appropriate processing chambers, providing versatile substrate acceptance without requiring separate dedicated tools for each substrate format.
Data Source
AI summary
Embodiments of equipment front end modules (EFEMs) are provided herein. In some embodiments, an EFEM includes: two or more loadports for receiving two or more types of substrates; an overhead storage unit having a plurality of storage shelves disposed above the two or more loadports and configured to hold two or more types of front opening unified pods (FOUPs) of different sizes that store the two or more types of substrates, respectively, wherein a horizontal alley is disposed between the plurality of storage shelves and the two or more loadports to provide a horizontal passageway for the FOUPs during transport to the two or more loadports; and an overhead transport system having a pair of vertical actuators disposed on opposite sides of the overhead storage unit and configured to transport FOUPs from the overhead storage unit to the two or more loadports.