Electrostatic Chuck Adapter Objects for High-Temperature Reliability
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Solution Overview
Problem
Electrostatic chucks used in high-temperature substrate processing often fail due to de-chucking, plasma erosion, and bond reliability issues at temperatures above 120°C, limiting their operational range.
Innovation Solution
An electrostatic chuck with a ceramic body, heating elements, and electrodes, featuring adapter objects bonded to the bottom by a metal bond, coupled with a base plate and cooling plate that applies uniform fastening force and includes a thermal gasket for temperature control, allowing operation up to 200-300°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electrostatic chucks are used in high-temperature processes above 120°C, then substrate processing capability is improved, but reliability deteriorates due to de-chucking, plasma erosion, and bond failure
Solution Approach 1:
The electrostatic chuck is divided into multiple independent components: a ceramic body containing electrodes and heating elements, adapter objects bonded to the ceramic body, and a separate base plate. This segmentation allows each component to be optimized for high-temperature performance and enables replacement of damaged parts without replacing the entire chuck assembly.
Solution Approach 2:
The chuck employs composite material construction with a ceramic body (providing high-temperature stability and dielectric properties), metal electrodes (for electrical conductivity), and metal adapter objects (for mechanical strength and thermal conductivity). This composite approach enables the chuck to withstand temperatures up to 300°C while maintaining structural integrity and electrostatic functionality.
2Strength
If multiple fasteners are used to couple the base plate to the electrostatic chuck, then mechanical strength is improved, but uniformity of fastening force deteriorates
Solution Approach 1:
The adapter objects incorporate multiple features (holes or recesses) distributed at different distances from the center of the ceramic body, allowing fasteners to be positioned at optimized locations. This local distribution of fastening points ensures uniform force application across the interface between the base plate and electrostatic chuck, preventing warping and ensuring even thermal and mechanical contact.
3Adaptability or versatility
If features are distributed at different distances from the center, then adaptability is improved, but device complexity increases
Solution Approach 1:
The adapter objects serve multiple functions: they provide mechanical coupling between the ceramic body and base plate, distribute fastening forces uniformly, facilitate thermal management by conducting heat from the ceramic body to the base plate, and offer configurable fastener positions through multiple distributed features. This multi-functionality reduces the need for separate components while enhancing adaptability.
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 enables reliable high-temperature operation by maintaining uniform heat transfer and thermal control, preventing failure and ensuring consistent substrate holding capabilities.
Implementation Method 1
one or more adapter objects bonded to a bottom of the electrostatic chuck by a metal bond
Implementation Method 2
one or more heating elements disposed in the ceramic body
Implementation Method 3
Electrostatic chucks are widely used to hold substrates, such as semiconductor wafers, during substrate processing
Implementation Method 4
a metal cooling plate disposed in the recess, the metal cooling plate comprising a plurality of channels to receive a coolant
Data Source
AI summary
An electrostatic chuck includes a ceramic body and adapter objects. The adapter objects collectively form a plurality of openings distributed over a bottom surface of the ceramic body at different distances from a center of a circle defined by the bottom surface of the ceramic body.