Gas Supply System for Rapid Plasma Processing Gas Switching
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Solution Overview
Problem
Existing gas supply systems for plasma processing apparatuses face challenges in stably and rapidly switching between multiple processing gases, which is crucial for efficient plasma treatments like atomic layer etching.
Innovation Solution
A gas supply system with multiple supply and exhaust lines, valves, and a controller that manages the flow and pressure of first and second processing gases through specific valve configurations and flow rate control to ensure stable and rapid switching, preventing backflow and maintaining predetermined gas ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a gas diffusion chamber is divided into multiple spaces with partition walls and valves are used to switch gas flow between spaces, then gas switching capability is achieved, but the switching speed and stability are insufficient
Solution Approach 1:
The gas supply system is divided into multiple independent gas supply lines, each dedicated to a specific processing gas. This segmentation allows each gas to be supplied through its own dedicated path with independent valve control, enabling rapid switching without the complexity of routing through partitioned chambers, thus improving switching speed while maintaining gas switching capability.
Solution Approach 2:
The system pre-establishes dedicated supply paths for each processing gas before switching is needed. When gas switching is required, the system simply opens the pre-configured path for the new gas and closes the path for the old gas, eliminating the need for complex real-time routing decisions and improving switching stability and speed.
2Adaptability or versatility
If valves are used to switch gas flow in a partitioned chamber, then multiple gases can be supplied, but the system complexity increases
Solution Approach 1:
Instead of using a single partitioned chamber with multiple valves to route different gases, the system segments the supply lines themselves, creating dedicated paths for each gas. This reduces the complexity of valve control and gas routing logic while maintaining the ability to supply multiple processing gases simultaneously or sequentially.
Solution Approach 2:
The gas injection unit serves as a universal interface that can receive and inject multiple different processing gases through its multiple gas injection holes. This multi-functional design eliminates the need for complex switching mechanisms within the injection unit itself, simplifying the overall system while maintaining multi-gas supply capability.
3Device complexity
If gas supply lines are shared and valves switch between gases, then system simplicity is maintained, but gas switching stability deteriorates
Solution Approach 1:
The system segments the gas supply into dedicated lines for each processing gas, eliminating the instability caused by shared lines and valve switching. Each gas has its own stable supply path from source to injection point, ensuring reliable and consistent gas delivery while maintaining relatively simple system architecture.
Data Source
AI summary
When a gas supplied to a gas injection unit is switched from a first processing gas to a second processing gas, a controller of a gas supply system performs control to open a first supply on/off valve connected to the gas injection unit and provided in a first gas supply line for supplying the first processing gas and a second exhaust on/off valve provided in a first gas exhaust line branched from the first gas supply line, close a second supply on/off valve connected to the gas injection unit and provided in a second gas supply line for supplying the second processing gas and a first exhaust on/off valve provided in a second gas exhaust line branched from the second gas supply line; and then open the second supply on/off valve and the first exhaust on/off valve and close the first supply on/off valve and the second exhaust on/off valve.