Electrostatic Chuck Interface Layer for Thermal Cycling Durability
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Solution Overview
Problem
Electrostatic chucks used in substrate processing face mechanical fatigue and cracking due to high temperatures and temperature cycling, caused by differences in thermal expansion coefficients of materials used in the chucks.
Innovation Solution
Incorporating an interface layer that forms a solid solution with the ceramic body, along with a dielectric layer and fluid channels, to mitigate mechanical fatigue and reduce volumetric expansion, thereby enhancing the chuck's durability and temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high temperatures and temperature cycling are used during substrate processing, then substrate processing capability is improved, but mechanical fatigue and cracking occur in the chuck materials
Solution Approach 1:
The patent changes the physical-chemical parameters of the chuck materials by incorporating specific additives (Al2O3, Y2O3, MgO, CaF2, LiF) in controlled amounts to modify thermal expansion coefficients and enhance high-temperature stability, allowing the chuck to withstand temperature cycling without mechanical fatigue
Solution Approach 2:
The patent creates composite ceramic materials by combining base ceramic compounds with multiple additives in specific proportions. This composite structure provides both high-temperature resistance and reduced thermal expansion mismatch, resolving the contradiction between temperature capability and reliability
2Adaptability or versatility
If different materials with different coefficients of thermal expansion are used in the chuck, then functional performance is improved, but mechanical fatigue and cracking occur
Solution Approach 1:
The patent adjusts the coefficient of thermal expansion parameter by adding specific compounds (Al2O3, Y2O3, MgO) to the ceramic matrix, bringing the thermal expansion coefficients of different chuck components closer together, thereby reducing thermal stress while maintaining functional performance
Solution Approach 2:
The patent applies different additives to specific regions or layers of the chuck structure where thermal stress concentration occurs, creating local compositional variations that optimize stress distribution while preserving overall functionality
3Temperature
If the chuck is designed to withstand high temperatures, then processing temperature capability is improved, but volumetric expansion increases causing mechanical stress
Solution Approach 1:
The patent modifies the thermal expansion parameter by incorporating additives with low thermal expansion coefficients (such as MgO, Al2O3) into the ceramic body, reducing the overall volumetric expansion of the chuck when heated, thereby maintaining dimensional stability at high temperatures
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 interface layer reduces the likelihood of cracking and extends the lifespan of the electrostatic chuck by minimizing volumetric expansion, allowing for higher temperature processing without mechanical failure.
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 forms a solid solution with the ceramic body
Implementation Method 2
a heating element or a plurality of heating elements embedded within the body
Implementation Method 3
one or more electrodes (e.g., an electrostatic and an RF electrode) embedded in 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.