At-Electrode RF Matching for Large Area Plasma Chambers
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Solution Overview
Problem
The increasing demand for larger substrates in the manufacturing of flat panels and solar cells poses challenges in handling and production, particularly due to increased RF power requirements, which leads to larger and more costly RF power transmission components, and conventional scale-up solutions do not provide acceptable or predictable results.
Innovation Solution
A plasma processing system with at-electrode RF matching, which reduces the footprint by integrating RF matching circuits within the system, allowing for offset positioning of RF transmission drives and freeing the center of the processing chamber, utilizing a distributed match network to compensate for load impedance asymmetries and reduce I2R losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional RF power transmission components are used for large area substrates, then the substrates can be processed, but the equipment size and cost increase significantly
Solution Approach 1:
The RF matching network is segmented and distributed to multiple electrode locations rather than using a single centralized matching network. This allows the RF power to be applied at multiple points across the large area substrate, reducing the requirements for any single RF transmission component and enabling processing of larger substrates without proportionally increasing component size and cost
Solution Approach 2:
The patent transitions from a single-point RF power transmission approach to a multi-point distributed approach across the electrode surface. By adding the dimension of spatial distribution of RF power application, the system can handle large area substrates without requiring oversized centralized RF components
2Device complexity
If RF matching circuits are placed outside the processing system, then the system design is simpler, but the footprint and cost increase
Solution Approach 1:
The RF matching circuits are merged with and integrated directly into the processing chamber structure, specifically incorporated into the electrode assembly. This eliminates the need for separate external matching networks, reducing the overall system footprint while maintaining the necessary RF matching functionality for efficient power transmission
3Power
If RF transmission drives are positioned at the center of the processing chamber, then the power transmission is efficient, but the center space is occupied and limits other design options
Solution Approach 1:
The centralized RF transmission approach is segmented into multiple distributed transmission points located at different positions around the chamber periphery. This segmentation allows RF power to be transmitted efficiently to multiple electrode locations without requiring a single centralized drive, thereby freeing the chamber center for other purposes while maintaining power transmission efficiency
Solution Approach 2:
The patent moves the RF transmission drives from a single central location to multiple peripheral locations, utilizing the circumferential space around the chamber. This spatial redistribution maintains effective RF power delivery to the electrodes while clearing the central chamber volume for substrate processing and other operational needs
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 solution reduces the footprint and cost of the plasma processing system, allows for flexible RF power application, and compensates for asymmetries in the RF generator connection point, resulting in efficient and predictable processing of large area substrates.
Implementation Method 1
biasing the RF tuning element with RF power to thereby generate a plasma from a gas mixture
Implementation Method 2
The RF tuning element is disposed between the cover and the electrode and is coupled to the electrode
Data Source
AI summary
A plasma processing system having at-electrode RF matching and a method for processing substrates utilizing the same is provided. In one embodiment, the plasma processing system includes a chamber body, the substrate support, an electrode, a lid assembly and an RF tuning element. A substrate support is disposed in a processing volume defined in the chamber body. The electrode is positioned above the substrate support and below a cover of the lid assembly. The RF tuning element is disposed between the cover and the electrode and is coupled to the electrode.