Dielectric Material for Predictive Insulation Breakdown Detection
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Solution Overview
Problem
Existing electrostatic chucks in semiconductor manufacturing suffer from instantaneous insulation breakdown when high voltage is applied, making it difficult to predict and prevent damage due to high current flow, and existing technologies fail to detect essential insulation degradation in porous dielectric materials.
Innovation Solution
A dielectric material with conductive particles dispersed in an insulating material, where the particle size distribution is tailored to slow down insulation breakdown, allowing for predictive measurement of electric resistance to anticipate and prevent insulation failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high voltage is applied to the insulating body in the electrostatic chuck, then the electrostatic attracting force is generated to fix the semiconductor substrate, but instantaneous insulation breakdown occurs and high current flows causing device damage
Solution Approach 1:
The patent changes the physical and chemical parameters of the insulating material by incorporating conductive particles with specific properties (particle diameter D10 ≤ 0.2 μm, D90 ≤ 2 μm, D90/D10 ≥ 3.0, D90/D50 ≥ 1.4) into the insulating body. This parameter modification enables the material to gradually progress through insulation breakdown stages rather than failing instantaneously, allowing detection before complete failure while maintaining electrostatic functionality.
Solution Approach 2:
The patent creates a composite material by dispersing conductive particles within an insulating material matrix. This composite structure combines the insulating properties needed for high voltage operation with controlled conductive pathways that prevent catastrophic failure. The conductive particles form a network that allows gradual current increase during insulation breakdown, enabling detection and prevention of complete insulation failure.
2Reliability
If conventional insulating materials are used in the electrostatic chuck, then plasma resistance and thermal conductivity are excellent, but insulation breakdown cannot be detected in advance and device damage occurs
Solution Approach 1:
The patent implements a feedback mechanism by measuring electric resistance of the insulating body at regular intervals or before each use. The conductive particles embedded in the insulating material create measurable changes in electric resistance as insulation degradation progresses. By monitoring this resistance feedback, the system can detect early signs of insulation breakdown and prevent complete failure, enabling predictive maintenance while maintaining plasma resistance.
3Difficulty of detecting and measuring
If porous dielectric material is used instead of insulating body, then moisture adsorption can be detected, but essential insulation breakdown cannot be predicted
Solution Approach 1:
The patent modifies the electrical parameters of the dielectric material by incorporating conductive particles with specific size distributions. This parameter change enables the material to exhibit measurable electric resistance changes during insulation breakdown progression. Unlike porous dielectric that only detects moisture, this modified material provides direct feedback on insulation integrity through resistance measurements, enabling prediction of actual insulation failure.
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 dielectric material enables gradual insulation breakdown detection, allowing for predictive maintenance and preventing device damage by measuring electric resistance, thereby ensuring the electrostatic chuck's reliability and extending its usable life.
Implementation Method 1
a dielectric material made of a composite sintered compact in which conductive particles are dispersed in an insulating material... allowing for predictive measurement of electric resistance to anticipate and prevent insulation failure
Implementation Method 2
a direct-current voltage is applied between the insulating body and the semiconductor substrate mounted on the insulating body, and thus a Coulomb force or an electrostatic attracting force due to a minor leaked current is generated, and the semiconductor substrate is fixed to the insulating body by the electrostatic attracting force
Data Source
AI summary
A dielectric material which is able to detect a sign of insulation breakdown before use or while in use, and thus is able to predict the insulation breakdown in advance is provided. Such a dielectric material is made of a composite sintered compact in which conductive particles are dispersed in an insulating material, in which in the conductive particles, a particle diameter D10 having a cumulative volume percentage of 10% by volume in a volume particle size distribution is 0.2 μm or less, a particle diameter D90 having a cumulative volume percentage of 90% by volume is 2 μm or less, a ratio (D90/D10) of the particle diameter D90 having a cumulative volume percentage of 90% by volume to the particle diameter D10 having a cumulative volume percentage of 10% by volume is 3.0 or more, and a ratio (D90/D50) of the particle diameter D90 having a cumulative volume percentage of 90% by volume to the particle diameter D50 having a cumulative volume percentage of 50% by volume is 1.4 or more.