Isolation Valve Layout for Ion Implant Chamber Maintenance
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Solution Overview
Problem
Existing ion implantation systems require frequent venting to atmosphere for preventative maintenance of the process chamber, leading to contamination and maintenance frequency of the entire system, which affects yield and throughput.
Innovation Solution
An isolation valve is introduced between the process chamber and upstream components, allowing localized maintenance without venting the rest of the system, thereby isolating the process chamber from the beam line components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the entire ion implantation system is vented to atmosphere for preventative maintenance, then the process chamber can be cleaned and maintained, but the rest of the system must also be vented and subjected to maintenance, increasing downtime and reducing productivity
Solution Approach 1:
The ion implantation system is divided into two independently maintainable segments: the process chamber and the beam line components. The isolation valve creates a physical and vacuum boundary between these segments, allowing the process chamber to be vented and maintained without affecting the vacuum status of the beam line components upstream. This segmentation enables localized maintenance operations.
Solution Approach 2:
The isolation valve extracts the process chamber from the vacuum system temporarily, allowing it to be isolated and vented to atmosphere while the rest of the system maintains its vacuum environment. This extraction enables independent maintenance of the process chamber without requiring the entire system to be taken out of operation.
2Reliability
If the process chamber is cleaned frequently to remove sputtered material deposits, then the chamber maintains optimal performance, but the entire system requires frequent venting and maintenance, affecting yield and throughput
Solution Approach 1:
The system is segmented into the process chamber and upstream beam line components separated by the isolation valve. This allows the process chamber to be cleaned and maintained frequently to remove sputtered material deposits without requiring maintenance of the entire system, thus maintaining chamber performance while preserving productivity.
Solution Approach 2:
The process chamber is extracted from the vacuum system through the isolation valve during cleaning operations. This enables frequent cleaning of the chamber to remove deposits while the upstream components remain in vacuum and operational, preventing contamination and maintaining system productivity.
3Ease of operation
If the isolation valve is placed in the beam line to isolate the process chamber, then localized maintenance is enabled, but the valve may contact biased rods in the electrostatic filter, causing contamination or damage
Solution Approach 1:
The isolation valve is designed with specific local qualities: it is positioned at a location in the beam line where it does not contact the biased rods of the electrostatic filter. The valve's movement path and physical dimensions are carefully designed to maintain clearance from sensitive components, enabling localized maintenance while avoiding contamination risks.
Solution Approach 2:
The isolation valve acts as an intermediary component that separates the process chamber from the beam line components. It is positioned and designed to perform the isolation function without interfering with or contacting the biased rods, thus mediating between the chamber and upstream components while preventing contamination.
Data Source
AI summary
An isolation valve for use in an ion implantation system is disclosed. The isolation valve is disposed between the process chamber, which houses the workpiece to be implanted, and the components located immediately upstream from the process chamber. This isolation valve may be closed to allow preventative maintenance to be performed on the process chamber without venting the rest of the ion implantation system. This may reduce particles and other material from traveling upstream from the process chamber during a preventive maintenance operation. This enhancement may reduce the frequency that the rest of the system undergoes preventative maintenance.