Metal Bonded Electrostatic Chuck for High Power Thermal Management
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Solution Overview
Problem
Conventional electrostatic chucks in semiconductor manufacturing experience bond material delamination and failure due to high temperature and high energy fields, leading to reduced processing yield and increased costs, as they are unable to reliably secure substrates during high-power processing.
Innovation Solution
A substrate support assembly with a metal or metal compound bonding layer that secures the electrostatic chuck to a cooling base, providing mechanical stability and heat transfer, and includes a thermal gasket to manage temperature gradients, ensuring the assembly can operate at high temperatures without delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrostatic chucks are used with cooling plates bonded by conventional materials, then the assembly can be manufactured with standard materials, but the bonding material delaminates and fails under high temperature and high energy fields
Solution Approach 1:
The patent changes the material parameter of the bonding layer from conventional materials to metal or metal compound materials, which fundamentally alters the thermal and mechanical properties to withstand high temperature and high energy field environments without delamination
Solution Approach 2:
The patent employs a composite structure consisting of an electrostatic chuck, a cooling plate, and a metal bonding layer. This composite material system combines the advantages of different materials: the electrostatic chuck provides electrical insulation and electrostatic holding capability, the cooling plate provides thermal management, and the metal bonding layer provides high-temperature stability and strong adhesion
2Ease of manufacture
If the bonding material is sensitive to thermal expansion and high temperature, then standard bonding materials can be used initially, but the bond fails under thermal stress and high energy fields
Solution Approach 1:
The patent changes the material parameters of the bonding layer to metal or metal compound materials that possess high melting points, high thermal conductivity, and high mechanical strength, enabling the bond to withstand thermal expansion stresses and high energy fields while maintaining structural integrity
3Productivity
If conventional electrostatic chucks experience bonding failure, then the processing chamber can be taken offline for replacement, but this reduces processing yield and increases costs
Solution Approach 1:
The patent employs a composite material system with a metal bonding layer that provides superior thermal stability, mechanical strength, and resistance to high energy fields, significantly extending the service life of the electrostatic chuck assembly and reducing unplanned downtime for replacements
Solution Approach 2:
By changing the bonding layer material to metal or metal compound with high melting point and high thermal conductivity, the patent creates an assembly that can operate reliably at high temperatures, preventing bond failure and maintaining continuous production
4Manufacturing precision
If high bias power is applied to improve film roughness and morphology, then processing quality improves, but heat energy increases causing thermal issues
Solution Approach 1:
The patent introduces a metal bonding layer as a thermal intermediary between the electrostatic chuck and the cooling plate. This bonding layer acts as a heat transfer medium that efficiently conducts heat away from the substrate, enabling the system to tolerate high bias power input while maintaining substrate temperature control
Solution Approach 2:
The composite structure with metal bonding layer provides enhanced thermal management capability, allowing the system to dissipate the heat generated by high bias power more effectively, thus maintaining both high film quality and controlled substrate temperature
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 longevity and heat transfer capabilities of the substrate support assembly, reducing the risk of delamination and maintaining processing yield while allowing for high-temperature operations, thus improving the reliability and efficiency of semiconductor manufacturing.
Implementation Method 1
a metal or metal compound bonding layer that secures the electrostatic chuck to a cooling base, providing mechanical stability and heat transfer
Implementation Method 2
electrostatic chucks to secure a substrate being processed within the chamber
Data Source
AI summary
Implementations described herein provide a substrate support assembly which provides longevity and good heat transfer. The substrate support assembly has an electrostatic chuck having a workpiece supporting surface and a bottom surface, a cooling base having a top surface and a bonding layer securing the bottom surface of the electrostatic chuck and the top surface of the cooling base. The bonding layer includes a layer of metal.