Electrostatic Chuck Interface Layer for Thermal Crack Resistance
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Solution Overview
Problem
Existing electrostatic chucks experience mechanical fatigue and cracking due to high temperatures and temperature cycling, which is exacerbated by differences in thermal expansion coefficients of materials used in the chuck's components.
Innovation Solution
Incorporating an interface layer that forms a solid solution with the ceramic body to mitigate mechanical fatigue, along with a dielectric layer and fluid channels to manage thermal expansion, using materials like aluminum nitride and molybdenum electrodes coated with gold or platinum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high temperatures and temperature cycling are used for substrate processing, then substrate processing capability is improved, but mechanical fatigue and cracking of chuck components occur
Solution Approach 1:
A diffusion barrier layer is introduced as an intermediary between the heating element and the ceramic body. This barrier layer prevents direct thermal and mechanical stress transfer from the heating element to the ceramic body during temperature cycling, thereby reducing mechanical fatigue and cracking while maintaining high temperature processing capability.
Solution Approach 2:
The electrostatic chuck employs a composite structure consisting of multiple materials (ceramic body, heating element, diffusion barrier layer) with different thermal and mechanical properties. This composite design allows each layer to perform its specific function while collectively resisting thermal stress and mechanical fatigue during high temperature cycling.
2Adaptability or versatility
If different materials with different coefficients of thermal expansion are used for body, electrodes, and heating elements, then functional performance is improved, but mechanical fatigue and cracking are exacerbated
Solution Approach 1:
The diffusion barrier layer serves as a stress-absorbing intermediary between materials with different coefficients of thermal expansion. It accommodates the differential expansion and contraction during temperature cycling, preventing stress concentration and cracking at material interfaces while preserving the functional benefits of using different materials.
Solution Approach 2:
The invention modifies the interface conditions between different materials by introducing a diffusion barrier layer with intermediate thermal and mechanical properties. This changes the stress distribution parameters at material interfaces, reducing peak stresses and preventing fatigue failure while maintaining the functional performance of the multi-material construction.
3Duration of action of stationary object
If an interface layer is added to mitigate mechanical fatigue, then chuck lifespan is improved, but device complexity increases
Solution Approach 1:
A diffusion barrier layer is introduced as an intermediary between the heating element and the ceramic body. This barrier layer prevents direct thermal and mechanical stress transfer from the heating element to the ceramic body during temperature cycling, thereby reducing mechanical fatigue and cracking while maintaining high temperature processing capability.
Solution Approach 2:
The electrostatic chuck employs a composite structure consisting of multiple materials (ceramic body, heating element, diffusion barrier layer) with different thermal and mechanical properties. This composite design allows each layer to perform its specific function while collectively resisting thermal stress and mechanical fatigue during high temperature cycling.
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
Reduces volumetric expansion and minimizes crack development, extending the lifespan of the electrostatic chuck and enhancing its temperature resistance.
Implementation Method 1
an interface layer formed overlying the heating element and/or the one or more electrodes, and/or between the ceramic body and the dielectric layer, wherein the interface layer can form a solid solution with the ceramic body
Implementation Method 2
Electrostatic chucks can be used for a variety of applications during the formation of devices. For example, an electrostatic chuck can be used to retain a substrate
Implementation Method 3
A typical electrostatic chuck can include a ceramic body, one or more electrodes (e.g., an electrostatic and an RF electrode) embedded in the body, and a heating element or a plurality of heating elements embedded within the body
Data Source
AI summary
Electrostatic chucks and methods of forming electrostatic chucks are disclosed. Exemplary electrostatic chucks include a ceramic body, a device embedded within the ceramic body, and an interface layer formed overlying the device. Exemplary methods include providing ceramic precursor material within a mold, providing a device, coating the device with an interface material to form a coated device, placing the coated device on or within the ceramic precursor material, and sintering the ceramic precursor material to form the electrostatic chuck and an interface layer between the device and ceramic material formed during the step of sintering.