Electrostatic Chuck Ceramic Encapsulating Member High Temperature
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Solution Overview
Problem
Conventional electrostatic chucks with polymer-type encapsulating layers are not suitable for high-temperature plasma processing due to melting or erosion, leading to inconsistent electrical properties and reduced ability to hold substrates effectively.
Innovation Solution
An electrostatic chuck with a ceramic or glass encapsulating member, matched to the coefficient of thermal expansion of the electrode assembly, providing enhanced heat resistance and plasma resistance, and including a support base and interleaved electrode fingers for improved substrate retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer-type encapsulating layers are used in electrostatic chucks, then ease of manufacture and low-temperature processing capability are improved, but heat resistance deteriorates causing melting or erosion at temperatures above 250°C
Solution Approach 1:
The patent changes the material parameter of the encapsulating layer from polymer-type to ceramic-type material. This fundamental material parameter change enables the electrostatic chuck to withstand high temperatures (above 250°C) while maintaining its structural integrity and electrical properties, resolving the heat resistance limitation of polymer materials.
Solution Approach 2:
The patent employs composite material structure by combining ceramic encapsulating layer with electrode assembly and support base. The ceramic material provides heat resistance and structural stability, while the integrated electrode assembly maintains electrical functionality, creating a composite system that achieves both thermal stability and electrical performance.
2Ease of manufacture
If polymer-type encapsulating layers are used in electrostatic chucks, then ease of manufacture is improved, but reliability deteriorates due to inconsistent electrical properties at high temperatures
Solution Approach 1:
The patent changes the material parameter from polymer to ceramic, which fundamentally alters the thermal and electrical stability characteristics. Ceramic materials maintain consistent electrical properties at high temperatures, ensuring reliable substrate retention and consistent processing performance, thereby resolving the reliability issue.
3Temperature
If ceramic or glass encapsulating members are used, then heat resistance is improved for high temperature processing, but device complexity increases
Solution Approach 1:
The patent changes the material parameter to ceramic or glass, which inherently provides high temperature resistance. While the material selection becomes more specific, the overall device structure remains similar to conventional electrostatic chucks, with the encapsulating member integrated with the electrode assembly and support base, thus limiting the increase in device complexity.
4Duration of action of stationary object
If ceramic or glass encapsulating members are used, then service life is improved through enhanced heat resistance, but manufacturing cost increases
Solution Approach 1:
The patent changes the material parameter to ceramic or glass, which provides enhanced heat resistance and durability for high temperature plasma processing applications. This extends the service life of the electrostatic chuck by preventing thermal degradation and erosion, although the manufacturing cost of ceramic materials is higher than polymer materials.
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 enhances the service life of the substrate support assembly, increases the process window, and reduces maintenance and manufacturing costs by maintaining substrate retention at high temperatures and preventing electrical property degradation.
Implementation Method 1
the encapsulating member is fabricated from one of a ceramic material or glass... providing enhanced heat resistance and plasma resistance
Implementation Method 2
Conventional electrostatic chucks with polymer-type encapsulating layers may not be suitable for use in such high temperature processes as the high temperature of corrosive species generated during plasma may melt or erode the polymer-type layers
Implementation Method 3
a substrate support assembly including an electrostatic chuck that holds the substrate to the substrate support assembly during processing
Data Source
AI summary
Embodiments of the present invention provide a substrate support assembly including an electrostatic chuck with enhanced heat resistance. In one embodiment, an electrostatic chuck includes a support base, an electrode assembly having interleaved electrode fingers formed therein, and an encapsulating member disposed on the electrode assembly, wherein the encapsulating member is fabricated from one of a ceramic material or glass.