Protective Seal for Electrostatic Chuck Bonding Material Erosion
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Solution Overview
Problem
Bonding materials in electrostatic chucks used in semiconductor processing chambers erode when exposed to elevated temperatures or harsh chemical environments, leading to particle contamination and processing issues.
Innovation Solution
Incorporating a protective element, such as a seal or shielding structure, around the bonding material to prevent erosion, and using a bonding material with silicon fillers and a polymer adhesive base that volatilizes without generating particles, reducing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bonding material is used to join chuck body and chuck base, then secure connection and thermal conductivity are achieved, but erosion and particle generation occur in harsh chemical environments
Solution Approach 1:
A protective seal is introduced as an intermediary element between the bonding material and the harsh chemical environment. The seal prevents direct contact between the plasma/chemicals and the bonding material, thereby preventing erosion and particle generation while maintaining the bonding material's structural and thermal functions
Solution Approach 2:
A flexible protective seal (such as an O-ring or gasket) is used to create a barrier around the bonding material. This flexible shell conformally seals the bonding interface, preventing chemical exposure without compromising the bonding material's thermal conductivity or mechanical strength
2Productivity
If bonding material is exposed to plasma processing, then processing can be performed, but erosion of bonding material occurs leading to particle contamination
Solution Approach 1:
The protective seal acts as a mediator that allows plasma processing to proceed while preventing the plasma from directly eroding the bonding material. The seal creates a protective barrier that maintains bonding material stability during processing operations
Solution Approach 2:
The protective seal is installed in advance to prevent erosion before it can occur. By establishing the barrier prior to processing, the bonding material is pre-protected from plasma exposure, preventing erosion and maintaining reliability throughout the processing cycle
3Temperature
If thermal conductive bonding material is used, then heat transfer is improved, but erosion resistance in harsh chemical environments deteriorates
Solution Approach 1:
The protective seal serves as a mediator that decouples the thermal conduction function from the chemical resistance requirement. The bonding material maintains its thermal conductivity while the seal provides the chemical erosion resistance, allowing both functions to coexist without compromise
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 prevents bonding material erosion and particle generation, enhancing processing quality and reducing maintenance costs by maintaining a secure and contamination-free environment within the processing chamber.
Implementation Method 1
The bonding materials provide secured connection between different components while providing thermal conductivity and/or electrical insulation
Implementation Method 2
A protective seal is disposed around a bonding material to protect the bonding material from erosion in a processing environment
Data Source
AI summary
Embodiments of the present invention provide chamber components having a protective element for shielding bonding material from processing environments in a processing environment. The protective element may include protective seals, protective structures, erosion resistive fillers, or combinations thereof. Embodiments of the present invention reduce erosion of bonding material used in a processing chamber, thus, improving processing quality and reducing maintenance costs.