Additive Electrostatic Chuck Structure for Helium Leak Reduction
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Solution Overview
Problem
Current methods for manufacturing electrostatic chucks in semiconductor processing face challenges in precision, complexity, and material limitations, particularly in achieving uniform temperature control and reducing defects such as helium leaks and cracking, which affect the performance and longevity of these components.
Innovation Solution
The use of additive manufacturing (AM) techniques to design and fabricate electrostatic chucks with embedded electrodes, sensors, and complex internal structures, allowing for improved design flexibility, heat transfer control, and diagnostics, enabling better chucking force application, local heating, and refurbishment of existing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manufacturing methods are used to fabricate electrostatic chucks, then production processes are simpler and more established, but manufacturing precision and component performance are limited
Solution Approach 1:
The patent applies preliminary action by embedding electrodes, sensors, and gas conduits within the ceramic body during the additive manufacturing process itself, rather than attempting to add these features afterward. This preliminary integration enables complex internal structures to be built with precise positioning from the outset, resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent utilizes another dimension by employing additive manufacturing to create three-dimensional complex internal structures, such as embedded electrodes and sensor arrays within the ceramic body. This dimensional approach allows features to be integrated throughout the volume of the component rather than仅限于 surface or simple internal channels, thereby achieving higher manufacturing precision without proportionally increasing overall device complexity.
2Temperature
If complex internal structures are integrated into electrostatic chucks, then heat transfer control and diagnostics are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies merging by combining multiple functional elements—electrodes for electrostatic chucking, sensors for diagnostics, and gas conduits for heating/cooling—into a single integrated ceramic body fabricated through additive manufacturing. This consolidation improves temperature control and diagnostic capabilities while managing manufacturing complexity through the unified additive process rather than separate assembly steps.
Solution Approach 2:
The patent applies parameter changes by utilizing the additive manufacturing process to precisely control the geometry, distribution, and positioning of internal structures such as electrodes and gas conduits. By changing the structural parameters during fabrication, the system achieves superior heat transfer control and diagnostic integration without proportionally increasing manufacturing complexity.
3Adaptability or versatility
If additive manufacturing is used to fabricate electrostatic chucks, then design flexibility and performance are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the electrostatic chuck into functional regions—such as electrode zones, sensor locations, and gas conduit pathways—that can be independently designed and optimized within the additive manufacturing process. This segmentation enables design flexibility for each functional element while managing overall manufacturing complexity through systematic process planning.
Solution Approach 2:
The patent applies universality by designing the ceramic body to simultaneously serve multiple functions: structural support, electrostatic chucking via embedded electrodes, thermal control through gas conduits, and diagnostics via integrated sensors. This multi-functionality approach maximizes design flexibility while consolidating manufacturing steps, thereby managing the ease of manufacture despite the advanced additive process required.
4Reliability
If traditional manufacturing methods are used, then production costs are lower and processes are more established, but defects such as helium leaks and cracking occur more frequently
Solution Approach 1:
The patent applies preliminary action by embedding electrodes, sensors, and gas conduits within the ceramic body during the additive manufacturing process itself, rather than attempting to add these features afterward. This preliminary integration enables complex internal structures to be built with precise positioning from the outset, resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent applies blessing in disguise by using the additive manufacturing process to eliminate the harmful effects of traditional manufacturing—such as helium leaks and cracking—by building components without the mechanical stress and joining operations that cause these defects. The layer-by-layer construction inherently reduces stress concentration and eliminates seams, converting the potential harm of complex manufacturing into the benefit of defect-free components.
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
AM techniques enhance the precision and performance of electrostatic chucks by reducing defects, improving capacitance, and extending the lifetime of components through refurbishment, while reducing costs and material consumption.
Implementation Method 1
one or more embedded electrodes within the ceramic body and arranged with respect to the first surface, wherein the one or more electrodes are configured to generate a retaining force on the surface of the substrate
Implementation Method 2
one or more gas conduits configured to introduce a gas into the two or more regions through the ceramic body and to the first surface, where the two or more regions are configured to retain a positive gas pressure within a respective region
Data Source
AI summary
An electrostatic chuck (ESC) including a ceramic body having a first surface with two or more regions defined on the first surface arranged concentrically with respect to each other on the first surface. Each region includes a retaining ring arranged on the first surface and defining an outer edge of the region, and structures arranged on the first surface and within the region configured to support a surface of a substrate when the substrate is retained by the electrostatic chuck. The ESC includes gas conduits configured to introduce a gas into the two or more regions through the ceramic body and to the first surface, and embedded electrodes within the ceramic body and arranged with respect to the first surface and configured to generate a retaining force on the surface of the substrate.