Cooled Cold Plate Layout for Etch Byproduct Trapping
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Solution Overview
Problem
In semiconductor device fabrication, the accumulation of etching and deposition byproducts on surfaces within the process chamber leads to the formation of thin films, which impede the movement of the movable shaft and compromise the seal provided by the O-ring, resulting in process inconsistencies and potential leaks.
Innovation Solution
The implementation of cooled plates within the process chamber to collect and trap etching and deposition byproducts, preventing their accumulation on critical surfaces such as the movable shaft and O-ring, thereby maintaining the integrity of the vacuum seal and ensuring consistent processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooled plates are added to collect byproducts, then reliability is improved, but device complexity increases
Solution Approach 1:
The cooled plate serves as an intermediary component that intercepts and collects etching and deposition byproducts before they can reach critical surfaces like the O-ring and movable shaft. By positioning the cooled plate in the byproduct migration path, it acts as a protective mediator that maintains vacuum seal integrity and prevents contamination without requiring fundamental redesign of the chamber architecture.
2Productivity
If byproducts are allowed to migrate to turbomolecular pumps, then productivity is maintained, but harmful factors increase
Solution Approach 1:
The cooled plate extracts byproducts from the vacuum chamber environment by providing a cold surface that traps and condenses volatile etching and deposition byproducts. This extraction mechanism removes harmful substances from the chamber atmosphere before they can settle on critical components, preventing film accumulation that would otherwise impede shaft movement and compromise the O-ring seal.
3Manufacturing precision
If shaft movement is impeded by deposited films, then manufacturing precision deteriorates, but no direct improvement is achieved
Solution Approach 1:
The cooled plate performs preliminary action by intercepting and collecting byproducts before they can migrate to and deposit on the movable shaft and O-ring. By establishing this preliminary collection mechanism, the system prevents the formation of friction-inducing films on the shaft surface, thereby maintaining constant scanning speed and processing precision throughout the chamber's operational life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cooled plates effectively capture etching and deposition byproducts, preventing their detrimental accumulation on surfaces within the process chamber, which enhances the reliability of semiconductor processing by maintaining consistent scanning speeds and preventing leaks.
Implementation Method 1
at least one cooled plate located within the process chamber for collecting byproducts of etching and deposition processes
Data Source
AI summary
An ion processing system including a process chamber containing a platen for supporting a semiconductor substrate, the platen mounted on a movable shaft, an ion source connected to the process chamber and adapted to project an ion beam toward the platen, and at least one cooled plate located within the process chamber for collecting byproducts of etching and deposition processes.