Electrostatic Chuck Refurbishment via Low-Temperature Indium Bonding
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Solution Overview
Problem
Electrostatic chucks experience uneven wear and poor uniformity due to localized non-uniformities and leakage in bonding materials, leading to early failure and poor wafer processing uniformity, which conventional refurbishment methods fail to adequately address.
Innovation Solution
A method involving a low-temperature indium bonding process to disassemble and reassemble electrostatic chuck components without damage, using a metal cooling plate bonded to a ceramic top plate, allowing for the separation and reuse of the metal plate while maintaining the ceramic plate's integrity, and applying a new indium bond for reassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If conventional refurbishment methods are used, then the chuck can be restored, but structural damage occurs to the metal cooling plate during disassembly
Solution Approach 1:
The patent changes the bonding temperature parameter from high temperature (conventional method) to low temperature (below 150°C). This parameter change allows the bond material to be softened and removed without causing thermal damage to the metal cooling plate, thus enabling refurbishment while preserving structural integrity
Solution Approach 2:
The patent introduces a low-temperature bond material as an intermediary between the metal cooling plate and ceramic top plate. This intermediary material can be softened at low temperatures to enable disassembly without damaging the metal plate, while still providing adequate bonding functionality
2Ease of repair
If the chuck is disassembled for refurbishment, then the ceramic top plate can be replaced, but the metal cooling plate may be damaged by high temperature processing
Solution Approach 1:
The patent changes the bonding temperature parameter from high temperature (conventional method) to low temperature (below 150°C). This parameter change allows the bond material to be softened and removed without causing thermal damage to the metal cooling plate, thus enabling refurbishment while preserving structural integrity
Solution Approach 2:
The patent applies a low-temperature bond material from the beginning, which enables future disassembly and refurbishment without damage risk. This preliminary choice of bond material creates the capability for safe refurbishment before it is actually needed
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
Extends the lifetime of electrostatic chucks by preventing structural damage during refurbishment, ensuring uniformity and reducing the risk of early failure through precise control of the bonding process, thereby maintaining consistent wafer processing quality.
Implementation Method 1
heating the bond material to a melting point of the bond material, thereby melting the bond material
Implementation Method 2
An electrostatic chuck has electrodes that are energized with a clamping voltage, which electrostatically clamps the wafer to the surface of the electrostatic chuck
Data Source
AI summary
Novel methods for extending electrostatic chuck lifetimes are provided. The methods involve providing a chuck having a metal cooling plate attached to a ceramic top plate, and after a period of use, disassembling the chuck, and providing a new chuck including the used metal cooling plate. In certain embodiments, the use of a low temperature bond material uniquely allows the described disassembly and reassembly without damage to other parts of the chuck.