Precursor Gas Supply Switching for Stable Semiconductor Processing
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Solution Overview
Problem
In semiconductor manufacturing, the stable supply of processing gases is disrupted when switching between containers, leading to instability in gas delivery to the process chamber, which can result in defects during film formation.
Innovation Solution
A system with multiple precursor containers, flow rate controllers, and valves that automatically switch between containers when the remaining gas amount falls below a threshold, ensuring continuous gas supply by opening valves between the containers and the flow rate controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single container is used to supply processing gas, then the device structure is simple, but the gas supply is interrupted when the container is depleted
Solution Approach 1:
The gas supply system is segmented into multiple independent containers (first container and second container), each capable of independently supplying processing gas. This segmentation allows the system to switch between containers, ensuring continuous gas supply while maintaining manageable individual container structures.
Solution Approach 2:
The system performs preliminary action by preparing a standby container (second container) in advance with sufficient gas supply capacity. When the first container is depleted, the second container is already ready to take over, preventing gas supply interruption without requiring complex real-time monitoring and switching mechanisms.
2Reliability
If multiple containers are used to ensure continuous gas supply, then the gas supply reliability is improved, but the system complexity increases
Solution Approach 1:
Multiple container supply systems are merged into a unified gas supply architecture where the first and second containers connect to common piping and control systems. This merging allows seamless switching between containers while presenting a simple, unified interface to the processing chamber, reducing overall system complexity.
Solution Approach 2:
The container system is designed with multi-functionality where each container can serve as either the primary or standby supply source. The piping and valve systems are configured to work with either container, providing universal functionality that simplifies the switching mechanism and reduces the need for dedicated switching components.
3Reliability
If the container switching threshold is set low, then the gas supply continuity is maintained, but the processing efficiency decreases due to frequent switching
Solution Approach 1:
The second container is prepared in advance with sufficient gas supply capacity to cover the entire remaining processing duration. This preliminary preparation allows the switching threshold to be set optimally without frequent switching, as the standby container is ready to provide extended supply, thereby maintaining both reliability and productivity.
Solution Approach 2:
The system monitors and adjusts the switching threshold parameter based on processing requirements and container gas levels. By dynamically optimizing the switching threshold, the system ensures continuous gas supply while minimizing the frequency of container switches, thus maintaining high processing efficiency.
Data Source
AI summary
There is provided a technique that includes: containers accumulating a material, a flow rate controller controlling a flow rate of the material supplied to a process space where a processing target is placed by regulating an opening state of a control valve; pipes being in fluid communication between the flow rate controller and the containers respectively; open and close valves provided at the pipes respectively, and a controller capable of supplying the material to the process space via the flow rate controller from one container when the opening state of the control valve does not reach a preset threshold, and supplying the material to the process space via the flow rate controller from two or more containers by opening the open and close valve provided between another container different from the one container and the flow rate controller when the opening state of the control valve reaches the preset threshold.