Airflow Management for Low Particulate Count in Process Tools
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Solution Overview
Problem
Current semiconductor processing systems face challenges in reducing particulate contamination and improving throughput while maintaining equipment reliability and efficiency, particularly due to limitations in wafer handling and air management within process chambers.
Innovation Solution
A system and method for airflow management in semiconductor processing tools that utilize a fan filter unit to provide filtered air, a reduced pressure exhaust mechanism, and strategically designed substrate transfer slots to minimize particle contamination and maintain chemical containment, incorporating a clock-arm substrate carrier mechanism and substrate traverser mechanism for efficient substrate handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single carrier linear wafer motion system is used, then equipment complexity is reduced, but productivity decreases due to non-productive return time
Solution Approach 1:
The system divides the wafer handling function into multiple independent carriers (at least two carriers) that can operate simultaneously in different process chambers, eliminating the need for a single carrier to return to its starting point and enabling continuous productive motion throughout the system
Solution Approach 2:
The multi-carrier system ensures that while one carrier is being transferred or processed, other carriers continue to move through process chambers, eliminating non-productive idle time and maintaining continuous useful action throughout the wafer handling cycle
2Productivity
If multiple process tools are joined in parallel to increase throughput, then productivity increases, but device complexity and particle generation increase
Solution Approach 1:
The patent combines multiple process chambers and carriers into a single integrated process tool, allowing multiple wafers to be processed simultaneously within one unified system rather than requiring separate tools, thereby increasing throughput without proportionally increasing overall system complexity
3Productivity
If wafer transfer slots are provided in chamber walls for efficient transfer, then productivity increases, but particulate contamination increases
Solution Approach 1:
The system introduces a controlled airflow field as an intermediary between the transfer slot and the process chamber interior, using positive pressure airflow to prevent particles from entering the chamber through the transfer slot while allowing efficient wafer transfer to continue
Solution Approach 2:
The patent changes the pressure parameter of the air within the process chamber, maintaining positive pressure relative to the transfer slot environment, which prevents particle ingress while allowing continuous efficient wafer transfer through the slots
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
The solution effectively reduces particulate contamination, enhances chemical containment, and increases throughput by maintaining low pressure in the substrate process area relative to the transfer section, allowing for high-efficiency substrate processing and reduced chemical vapor escape.
Implementation Method 1
a fan filter unit to provide filtered air
Implementation Method 2
a reduced pressure exhaust mechanism
Implementation Method 3
maintaining low pressure in the substrate process area relative to the transfer section
Data Source
AI summary
A method of providing airflow management in a substrate production tool includes providing a first mechanism coupling the substrate production tool to a fan filter unit. The fan filter unit provides filtered air to the substrate production tool. A second mechanism couples the substrate production tool to a reduced pressure exhaust mechanism. The reduced pressure exhaust mechanism provides an exhaust for excess gas flow within the substrate production tool. A substrate process area of the substrate production tool is maintained at a lower pressure than a pressure of a substrate transfer section of the substrate production tool. The substrate process area maintains a higher pressure than a pressure of the reduced pressure exhaust mechanism. The substrate transfer section maintains a higher pressure than the pressure of the reduced pressure exhaust mechanism.