Electrostatic Chuck Bonding Layer Design for Plasma Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrostatic chucks face challenges with adhesive durability and particle scattering during high-temperature and plasma processes, leading to reduced thermal conductivity and uneven temperature distribution, which limits their throughput and lifespan.
Innovation Solution
An electrostatic chuck design featuring a ceramic dielectric substrate with a metallic base plate and a bonding layer made of resin material, where the bonding layer has a recessed end face and a gas introduction path with a porous body, reducing adhesive damage and particle scattering by creating a pocket for particle deposition and enhancing thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to bond ceramic dielectric substrate to metal base plate, then bonding strength and thermal transference are improved, but plasma resistance deteriorates and adhesive damage occurs during plasma process
Solution Approach 1:
The bonding layer is designed with non-uniform thickness, featuring a first area with greater thickness and a second area with lesser thickness. This local variation allows the thicker region to provide enhanced plasma resistance and protection, while the thinner region maintains adequate bonding strength and thermal transference, resolving the contradiction between these two requirements.
Solution Approach 2:
The bonding layer is constructed as a composite structure combining resin material with ceramic fillers. This composite approach integrates the adhesive properties of resin with the plasma resistance and thermal conductivity of ceramic particles, achieving both strong bonding and high plasma resistance simultaneously.
2Reliability
If adhesive is damaged during plasma process, then particle source increases and thermal conductivity reduces, but uniform temperature distribution is required
Solution Approach 1:
The bonding layer is designed with excessive thickness in the first area, creating a protective cushion that absorbs plasma damage before it reaches the ceramic dielectric substrate. This pre-positioned protective layer prevents adhesive degradation and particle generation during the plasma process.
Solution Approach 2:
The bonding layer incorporates ceramic fillers that create a porous structure, enhancing plasma resistance and thermal conductivity. This porous composite structure allows the bonding layer to withstand plasma exposure without degrading, preventing particle scattering while maintaining thermal performance.
3Productivity
If higher throughput is achieved by increasing plasma process output and temperature, then productivity increases, but thermal resistance of materials limits performance
Solution Approach 1:
The bonding layer's composition is modified by incorporating ceramic fillers with high thermal conductivity, fundamentally changing its thermal parameters. This allows the bonding layer to transmit plasma-generated heat efficiently from the ceramic dielectric substrate to the metal base plate, enabling higher process temperatures and improved throughput without material failure.
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 design reduces adhesive damage and particle scattering, maintaining uniform temperature distribution and extending the electrostatic chuck's lifespan by improving thermal conductivity and plasma resistance.
Implementation Method 1
the thermal conductivity of the adhesive is reduced, and thus a function of heat conduction and a function of uniformly maintaining the temperature of the object to be adsorbed are not sometimes fulfilled
Implementation Method 2
The electrostatic chuck is for applying power for electrostatic adsorption to the built-in electrode, thereby adsorbing a substrate such as a silicon wafer by an electrostatic force
Data Source
AI summary
An electrostatic chuck includes: a ceramic dielectric substrate having a first major surface, a second major surface, and a through-hole; a metallic base plate which has a gas introduction path that communicates with the through-hole; and a bonding layer which is provided between the ceramic dielectric substrate and the base plate and includes a resin material. The bonding layer has a space which is provided between an opening of the through-hole in the second major surface and the gas introduction path and is larger than the opening in a horizontal direction, and a first area in which an end face of the bonding layer on a side of the space intersects with the second major surface being recessed from the opening further than a second area of the end face which is different from the first area.