Shared Precursor Gas Distribution With Fast Pulsing Flow Control
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Solution Overview
Problem
Existing gas distribution systems for semiconductor processing waste expensive precursor gases by diverting them to the foreline when not in use and require costly dedicated delivery hardware for each wafer processing station, limiting efficiency and increasing costs.
Innovation Solution
A gas distribution apparatus with a shared volume and fast pulsing valves at each downstream end, minimizing precursor waste and reducing hardware costs by using a single precursor distribution system for multiple processing stations, ensuring accurate and reproducible delivery through pressure control and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated gas stick is used for each wafer processing station, then gas delivery reliability is improved, but hardware cost and system complexity increase
Solution Approach 1:
Multiple gas delivery functions are merged into a single shared volume system. Instead of having separate gas sticks for each processing station, one shared volume distributes precursor gas to multiple stations through individual flow controllers, reducing hardware cost while maintaining delivery reliability
Solution Approach 2:
The shared volume is designed to serve multiple processing stations simultaneously. A single shared volume can deliver precursor gas to any number of downstream processing stations by activating the appropriate flow controller, making the system universal and multi-functional
2Device complexity
If precursor gas is diverted to the foreline when not in use, then system simplicity is maintained, but precursor waste increases
Solution Approach 1:
The flow controllers enable periodic activation of precursor gas flow only when needed by a processing station. Instead of continuous flow or simple foreline diversion, the system activates gas delivery in periodic pulses synchronized with processing station requirements, eliminating waste while maintaining simplicity
Solution Approach 2:
The system automatically activates precursor gas delivery only when a processing station requires it, through the flow controller's demand-driven operation. The system self-regulates to deliver gas only when needed, eliminating the need for manual control or simple foreline diversion that wastes precursor
3Device complexity
If a shared volume system is used for multiple processing stations, then hardware cost is reduced, but gas distribution uniformity may worsen
Solution Approach 1:
Each downstream end of the shared volume is equipped with an individual flow controller that can be independently calibrated and adjusted. This local control ensures that each processing station receives the precise gas flow it needs, maintaining distribution uniformity despite using a shared volume system
Solution Approach 2:
The flow controllers enable independent adjustment of gas flow parameters for each processing station. By changing flow rate parameters individually at each downstream end, the system compensates for variations in the shared volume distribution, ensuring uniform gas delivery across all stations
Data Source
AI summary
Gas distribution apparatus to provide uniform flows of gases from a single source to multiple processing chambers are described. A regulator is positioned at an upstream end of a shared volume having a plurality of downstream ends. A flow controller is positioned at each downstream end of the shared volume, the flow controller comprising an orifice and a fast pulsing valve. Methods of using the gas distribution apparatus and calibrating the flow controllers are also described.