Electrostatic Chuck Dielectric Structure for Charge Release and Cooling
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Solution Overview
Problem
Existing electrostatic chuck devices face limitations in generating sufficient electrostatic force and managing interface charges, particularly due to variations in dielectric constants and electrical conductivity, which affect their efficiency in substrate processing and transport applications.
Innovation Solution
The electrostatic device incorporates a dielectric layer with a ring-shaped protrusion, a cooling gas-filled concave area, and a surface treatment with controlled roughness, along with a light-providing unit to optimize electrostatic force and reduce interface charges through precise voltage application and light irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional electrostatic chuck device uses a uniform dielectric layer, then the structure is simple and easy to manufacture, but the electrostatic force is insufficient and interface charges cannot be effectively managed
Solution Approach 1:
The dielectric layer is divided into multiple regions with different dielectric constants: a first dielectric layer with a first dielectric constant and a second dielectric layer with a second dielectric constant. This local variation in dielectric properties allows different areas to contribute differently to electrostatic force generation, thereby increasing the overall electrostatic force while maintaining a manageable structural complexity through systematic material differentiation.
Solution Approach 2:
The patent employs a composite dielectric structure consisting of multiple dielectric layers with different material properties. The first dielectric layer and second dielectric layer are combined to create a composite structure that leverages the advantageous properties of each material, achieving enhanced electrostatic force generation and improved interface charge management through the synergistic effect of heterogeneous dielectric materials.
2Reliability
If the dielectric layer uses a single material with uniform electrical conductivity, then the manufacturing process is simplified, but interface charges accumulate and reduce device efficiency
Solution Approach 1:
The dielectric structure incorporates regions with different electrical conductivity characteristics through the use of different dielectric materials. The first dielectric layer and second dielectric layer have different electrical properties that allow for localized charge management, enabling effective control of interface charges at specific locations while maintaining overall manufacturing feasibility through established multi-layer fabrication techniques.
3Force
If the electrostatic device operates without temperature control, then the operation is simpler, but the electrostatic force decreases and substrate processing efficiency is reduced
Solution Approach 1:
The patent incorporates a temperature control system that actively regulates the operating temperature of the electrostatic device. By maintaining the dielectric layers at an optimized temperature range, the electrical properties of the dielectric materials are enhanced, resulting in improved electrostatic force generation and overall device performance, while the temperature control is integrated in a manner that balances performance enhancement with operational complexity.
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
This configuration significantly enhances electrostatic force and reduces interface charges, improving the device's efficiency in substrate processing and transport by leveraging differences in dielectric constants and conductivity, while also enabling effective dechucking operations.
Implementation Method 1
Electrostatic chuck (ESC) is a device for adsorbing and fixing a substrate using electrostatic force generated by a difference in electrical potential.
Implementation Method 2
The protrusion part may form a concave area, the concave area may be filled with a cooling gas
Implementation Method 3
the concave area may be filled with a cooling gas
Implementation Method 4
a light-providing unit providing visible light or ultraviolet light to the dielectric layer
Data Source
AI summary
An electrostatic device according to one embodiment of the present invention comprises: an electrostatic electrode layer; a dielectric layer arranged on the electrostatic electrode layer; and a ring-shaped protrusion part arranged and formed on an edge of the dielectric layer, wherein the protrusion part forms a concave area, the concave area is filled with a cooling gas, and the protrusion part comprises a flat area and a surface treatment area to which a roughening treatment has been performed.