Electrostatic Chuck Adhesion Layer Spacer Optimization
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Solution Overview
Problem
Existing electrostatic chuck devices face issues with securing sufficient adhesion between the electrostatic chuck section and the base section due to the water-repellent and oil-repellent properties of silicone adhesives, leading to a decrease in adhesive force.
Innovation Solution
An electrostatic chuck device with a first adhesion layer containing spacers and silicone adhesive, where the layer thickness and spacer diameter ratio are optimized to enhance adhesion, and a second adhesion layer with silicone adhesive is used to maintain strong bonding between the electrostatic chuck section and the heating member, and subsequently the base section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone adhesive is used for bonding the electrostatic chuck section and base section, then the adhesive provides water-repellent and oil-repellent properties, but the adhesion force between the adhesive layers decreases
Solution Approach 1:
A first adhesion layer containing spacers and silicone adhesive is introduced as an intermediary between the electrostatic chuck section and the second adhesion layer. This intermediate layer with optimized thickness (3-25 μm) and spacer distribution (ratio φS/D of 0.1 to 1.0) mediates the bonding interface, improving overall adhesion strength while managing the water-repellent properties of silicone adhesive
Solution Approach 2:
The adhesion system uses a composite structure combining spacers and silicone adhesive in the first adhesion layer, and silicone adhesive in the second adhesion layer. This composite approach leverages the complementary properties of spacers (structural support, spacing control) and silicone adhesive (bonding, water-repellent properties) to achieve both strong adhesion and desired repellent characteristics
2Manufacturing precision
If the adhesion layer thickness is reduced to prevent adhesive protrusion during hot calender, then the adhesion strength between layers is insufficient
Solution Approach 1:
The thickness of the first adhesion layer is precisely controlled within the range of 3-25 μm, and the ratio of spacer particle diameter to layer thickness (φS/D) is optimized to 0.1 to 1.0. These parameter optimizations allow the layer to be thin enough to prevent protrusion during hot calender while maintaining sufficient adhesion strength through enhanced spacer distribution and intimate contact
3Manufacturing precision
If the adhesion layer is made thin to improve bonding precision, then the spacer distribution and adhesion uniformity become difficult to control
Solution Approach 1:
By optimizing the layer thickness to 3-25 μm and the spacer-to-thickness ratio (φS/D) to 0.1 to 1.0, the patent achieves a parameter regime where spacers are sufficiently small to distribute uniformly in thin layers yet large enough to maintain structural integrity and bonding uniformity. This precise parameter control enables both thin layer formation and homogeneous spacer distribution
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 optimized adhesion layer thickness and spacer distribution secure the adhesive force between the electrostatic chuck section and the base section, ensuring excellent adhesion and in-plane temperature uniformity.
Implementation Method 1
a first adhesion layer which contains spacers and a silicone adhesive and in which a layer thickness D is in a range of 3 to 25 μm and a ratio (φS/D) between the layer thickness D and an average particle diameter φS of the spacers is in a range of 0.1 to 1.0
Implementation Method 2
a first adhesion layer which contains spacers and a silicone adhesive... a second adhesion layer which contains a silicone adhesive
Implementation Method 3
a base section having a function of cooling the electrostatic chuck section
Implementation Method 4
a plurality of heating members bonded to the surface on the side opposite to the placing surface of the electrostatic chuck section
Data Source
AI summary
Provided is an electrostatic chuck device which includes: an electrostatic chuck section having one main surface serving as a placing surface on which a plate-shaped sample is placed, and having a built-in internal electrode for electrostatic attraction; a first adhesion layer which contains spacers and a silicone adhesive and in which a layer thickness D is in a range of 3 to 25 μm and a ratio (ϕS/D) between the layer thickness D and an average particle diameter ϕS of the spacers is in a range of 0.1 to 1.0; a plurality of heating members bonded to the surface on the side opposite to the placing surface of the electrostatic chuck section in a pattern having a gap with respect to one another by the first adhesion layer; a second adhesion layer which contains a silicone adhesive; and a base section having a function of cooling the electrostatic chuck section.