Dielectric Arrestor Insert With Helical Channels
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Solution Overview
Problem
In semiconductor manufacturing, high ion energy etching processes using helium plasma lead to unwanted electrical arcing and plasma generation in helium supply lines, causing damage due to the high voltage gradient, and existing insulators increase costs without adequately addressing these issues.
Innovation Solution
A dielectric arrestor insert with non-linear channels, such as helical channels, is used to increase the helium gas path length, reducing the likelihood of arcing and plasma generation while maintaining sufficient helium flow and minimizing pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric arrestor insert is installed to prevent electrical arcing and plasma generation, then component damage is reduced, but device complexity and cost increase
Solution Approach 1:
The dielectric arrestor insert is nested within the existing helium supply line structure, fitting inside the chamber wafer processing system without requiring external housing or separate components. This nested approach prevents electrical arcing while minimizing added complexity by utilizing the existing system geometry.
Solution Approach 2:
The dielectric arrestor insert acts as an intermediary component between the high voltage electrostatic chuck and the helium supply line, providing electrical isolation and preventing arcing. This mediator approach protects downstream components without requiring fundamental redesign of the plasma generation system.
2Reliability
If the helium gas path length is increased to reduce arcing likelihood, then electrical discharge prevention improves, but pressure drop increases
Solution Approach 1:
The arrestor insert employs curved and helical channel geometries instead of straight paths. These curved channels increase the effective gas path length and electrical breakdown distance while maintaining compact physical dimensions, thereby reducing arcing likelihood without creating excessive pressure drop that would occur with simply lengthening straight channels.
Solution Approach 2:
The helical and three-dimensional channel structures utilize vertical and radial dimensions within the arrestor insert housing. By routing helium through multiple levels and angular directions rather than a single linear path, the design extends the electrical discharge prevention distance while keeping the pressure drop manageable through optimized channel cross-sections.
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 solution effectively decreases the occurrence of arcing and plasma generation within the dielectric arrestor insert and helium supply lines, preventing damage and maintaining helium flow efficiency, thus reducing operational costs and extending component lifespan.
Implementation Method 1
creates unwanted electrical arcing between surfaces and generates plasma in the supply lines
Implementation Method 2
generates plasma in the supply lines and other components
Implementation Method 3
creates a large electrical field gradient extending back into the helium supply line
Data Source
AI summary
A dielectric arrestor insert for use in a chamber wafer processing system having a gas input line, an arrestor housing and a wafer processing space. The input line is able to provide gas to the arrestor housing. The arrestor housing is able to house the dielectric arrestor insert. The dielectric arrestor insert comprises a gas entry portion, a non-linear channel and a gas exit portion. The gas entry portion is arranged to receive the gas from the input line. The non-linear channel is arranged to deliver the gas from the gas entry portion to the gas exit portion. The gas exit portion is arranged to deliver the gas from the non-linear channel to the wafer processing space.