RF Ground System with Flexible Straps for Plasma Chamber
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Solution Overview
Problem
Current radio frequency (RF) ground path designs in plasma-enhanced CVD processes are complex, expensive, and require high maintenance, and do not effectively prevent arcing and RF leakage in the process chamber.
Innovation Solution
A simplified RF return path design using a ground assembly with a top flange, bottom flange, and flexible straps that couple the ground plate to the chamber body, providing a stable and efficient path for RF current, reducing arcing and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current ground path designs are used, then RF power is directed away from chamber components, but the design becomes complicated, expensive, and high maintenance
Solution Approach 1:
The ground path is segmented into multiple discrete components: a ground plate coupled to the substrate support, a top flange, a bottom flange, and multiple flexible straps connecting the flanges. This segmentation allows each component to be independently optimized and replaced, reducing overall system complexity and maintenance requirements while maintaining effective RF power direction away from chamber components.
Solution Approach 2:
The flexible straps provide a dynamic ground path connection that can accommodate substrate support movement and positioning adjustments. The flexibility allows the ground path to maintain electrical continuity while adapting to changing operational conditions, eliminating the need for complex rigid mounting structures and reducing maintenance needs.
2Reliability
If current ground path designs are used, then RF power is directed away from chamber components, but the cost increases
Solution Approach 1:
The ground plate, flanges, and straps are designed as relatively simple, replaceable components that can be manufactured at lower cost. The modular design allows individual components to be replaced rather than replacing an entire complex ground path system, reducing both initial manufacturing cost and long-term operational costs.
3Reliability
If current ground path designs are used, then RF power is directed away from chamber components, but maintenance requirements increase
Solution Approach 1:
The segmented modular design allows individual components (ground plate, flanges, straps) to be independently inspected, removed, and replaced. This significantly reduces maintenance complexity compared to integrated ground path designs, as only faulty components need replacement rather than the entire system.
Solution Approach 2:
The flexible straps and modular components are designed to be easily installed and removed without specialized tools or complex procedures. The self-contained nature of each component allows for quick replacement by operators with minimal training, reducing maintenance time and costs.
4Object-affected harmful factors
If current ground path designs are used, then arcing is reduced, but the design does not entirely address arcing in the process chamber
Solution Approach 1:
The ground path design serves multiple functions: it provides a low-impedance RF return path, establishes a reference potential throughout the chamber, and creates multiple discharge paths for RF energy. The flexible straps and distributed flange configuration ensure comprehensive RF power distribution and arcing prevention across the entire process chamber volume, not just at specific locations.
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 effectively reduces RF leakage and arcing, maintaining a stable processing environment with reduced maintenance requirements and improved process uniformity, allowing for consistent substrate processing across varying substrate support positions.
Implementation Method 1
A top flange is coupled to a lower peripheral surface of the ground plate and a bottom flange is coupled to a bottom of the chamber body. The bottom flange and the top flange are coupled to one another with a plurality of straps, each of the straps having a first end coupled to the bottom flange and a second end coupled to the top flange.
Implementation Method 2
Radio frequency (RF) power is used to activate the process gasses in the process chamber to generate plasma.
Data Source
AI summary
The present disclosure provides an apparatus including a chamber body and a lid defining a volume therein. The apparatus includes a substrate support disposed in the volume opposite the lid. The substrate support includes a support body disposed on a stem, and a ground plate disposed between the support body and the stem. A top flange is coupled to a lower peripheral surface the ground plate and a bottom flange is coupled to a bottom of the chamber body. The bottom flange and the top flange is coupled to one another with a plurality of straps, each of the straps having a first end coupled to the bottom flange and a second end coupled to the top flange.