Substrate Exhaust Line Switching for Stable Film Formation
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Solution Overview
Problem
The existing substrate processing apparatuses face challenges in maintaining desired process conditions due to deterioration of the exhaust system, leading to characteristic deterioration of process results, especially when the first exhaust line transitions into a predetermined state, causing issues like decreased exhaust amount, pump failures, or valve malfunctions.
Innovation Solution
The apparatus includes a controller that performs line change processing by switching the exhaust path from the first exhaust system to the second exhaust system or using a bypass line, allowing the precursor gas to be exhausted via the second exhaust system, thereby maintaining desired film formation conditions and preventing characteristic deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single exhaust system is used, then the device complexity is reduced, but the reliability deteriorates due to pump failures, valve malfunctions, or line blockages
Solution Approach 1:
The exhaust system is divided into multiple independent exhaust lines (first exhaust line and second exhaust line), each capable of operating separately. This segmentation allows the system to maintain functionality even when one line fails, directly resolving the contradiction between reliability and complexity by trading controlled complexity for significant reliability improvement.
Solution Approach 2:
The patent implements a redundant exhaust system where a second exhaust line is prepared in advance as a backup. When the first exhaust line transitions to a predetermined state (failure), the system automatically switches to the second line, providing beforehand cushioning against failures and maintaining continuous operation.
2Productivity
If the exhaust system operates continuously without maintenance, then productivity is maintained, but the reliability deteriorates due to accumulation of by-products and degradation
Solution Approach 1:
The patent enables continuous substrate processing by implementing a redundant exhaust system. When the first exhaust line is in use, the second line can be maintained or serviced without interrupting the process, as the system can switch between lines. This maintains continuous useful action while allowing periodic maintenance.
Solution Approach 2:
The system allows the first exhaust line to be taken out of service (discarded from active duty) when it transitions to a predetermined state, while the second line takes over. This enables recovery and maintenance of the first line without stopping production, as the second line recovers the exhaust function temporarily.
3Reliability
If exhaust line switching is implemented, then the reliability improves, but the device complexity and control difficulty increase
Solution Approach 1:
The patent implements automatic switching based on feedback from the exhaust system state. When the first exhaust line transitions to a predetermined state (detected through sensors monitoring pressure, flow, or other parameters), the controller automatically switches to the second exhaust line without manual intervention, managing the increased complexity through automated feedback control.
Solution Approach 2:
The controller acts as an intermediary that manages the complexity of switching between exhaust lines. It monitors the state of the first exhaust line and automatically coordinates the switching operation, shielding the user from the complexity while maintaining reliable process continuity.
4Reliability
If maintenance is performed on the exhaust system, then the reliability is restored, but the productivity decreases due to processing interruptions
Solution Approach 1:
The redundant second exhaust line serves as beforehand cushioning that enables maintenance of the first exhaust line without interrupting substrate processing. When maintenance is needed, the system switches to the second line in advance, allowing the first line to be serviced while productivity continues uninterrupted.
Solution Approach 2:
The patent merges two exhaust lines into a single unified exhaust system that can operate independently or in combination. This merging allows flexible allocation of exhaust capacity, enabling one line to handle full load during maintenance of the other, thus maintaining productivity while restoring reliability.
Data Source
AI summary
There is provided a technique that includes: a first gas supply line configured to supply a first gas to a substrate in a process chamber; a first exhaust line connected to a first pump and exhausting the first gas supplied to the substrate; a first valve installed at the first exhaust line; a second gas supply line configured to supply a second gas to the substrate in the process chamber; a second exhaust line connected to a second pump and exhausting the second gas supplied to the substrate; a second valve installed at the second exhaust line; and a controller capable of controlling the first valve and the second valve, so as to perform a first line change processing of exhausting the first gas supplied to the substrate toward the second pump via the second exhaust line, when determining that the first exhaust line transitioned into a predetermined state.