Preformed Triple Junctions for Electrode Conductivity Maintenance
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Solution Overview
Problem
In semiconductor and plasma systems, insulating deposits on electrodes lead to voltage breakdown and increased particle generation, reducing service life and increasing yield loss, especially in environments with plasma and ion beams where free charge and radiation further degrade insulator integrity.
Innovation Solution
The formation of preformed triple junctions with preferred dielectrics and geometries on electrode surfaces promotes localized plasma cleaning, maintaining electrode conductivity by creating discharge activity that breaks down insulating deposits, either through geometric design or preformed dielectric layers, thereby extending service life and reducing particle generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrodes operate in plasma and ion beam environments, then productivity and manufacturing capability are improved, but insulating deposits form on electrodes leading to voltage breakdown and increased particle generation
Solution Approach 1:
The patent pre-forms triple junctions on electrode surfaces before operation begins. These triple junctions are strategically positioned to intercept insulating deposits before they can spread across the electrode surface and cause voltage breakdown. By preparing these protective geometric features in advance, the system maintains electrode conductivity and reduces particle generation throughout the manufacturing process.
Solution Approach 2:
The patent converts the harmful effect of insulating deposits into a beneficial protective mechanism. Instead of trying to prevent deposit formation entirely, the design allows deposits to form but channels them into pre-formed triple junctions where they create localized discharge activity. This discharge activity actually cleans the electrode surface by breaking down deposits, thus converting the harmful deposits into a self-cleaning mechanism that maintains electrode conductivity.
2Duration of action of stationary object
If insulating deposits accumulate on electrodes, then service life is reduced due to voltage breakdown, but increasing cleaning frequency increases downtime and reduces productivity
Solution Approach 1:
The patent implements a self-service mechanism where pre-formed triple junctions automatically generate localized discharge activity that cleans insulating deposits from electrode surfaces. This self-cleaning process occurs continuously during normal operation without requiring external intervention or system shutdown. The triple junctions serve themselves by using the presence of deposits to generate the cleaning discharge, thereby extending service life while maintaining uninterrupted productivity.
3Reliability
If preformed triple junctions are added to electrode design, then electrode conductivity is maintained and particle generation is reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by forming triple junctions only at specific strategic locations on the electrode surface where deposits are most likely to accumulate and cause breakdown. Rather than modifying the entire electrode structure, the triple junctions are localized features concentrated at critical points. This approach maintains electrode conductivity and reduces particle generation while minimizing the overall increase in device complexity.
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
This approach maintains localized electrode surface conductivity and functionality, reducing particle counts and extending the service life of semiconductor manufacturing tools by utilizing discharge activity at triple junctions to clean insulating deposits, thus preventing breakdowns and improving operational reliability.
Implementation Method 1
Electric field enhancement at vacuum triple junctions can cause insulator breakdown
Implementation Method 2
electron field emission can create a creeping discharge along the insulator surface
Implementation Method 3
localized plasma cleaning, and thereby maintains localized electrode surface conductivity
Implementation Method 4
Transient, low current electrical breakdown activity is routinely present in systems with high electric field. In air or vacuum, this is called corona. Corona cleaning, or, plasma discharge cleaning, is well known, and has often been used as a conditioning process for high voltage electrodes.
Data Source
AI summary
In systems where insulating deposits form during normal operation, electrodes are configured with a preformed dielectric thereon, wherein the preformed dielectric is formed with a geometric feature that preforms a triple junction. These triple junctions enhance low level discharge activity to facilitate localized breakdown of the deposits and maintain electrode conductivity.