Linear Electrode Plasma Source for Edge-Uniform Processing
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Solution Overview
Problem
Current plasma processing technologies face challenges in achieving high uniformity across substrates, particularly at the edges, due to edge effects from chamber walls and the complexity of controlling plasma generation systems, which often require cumbersome control schemes and extensive calibration.
Innovation Solution
A plasma generating component with a one-dimensional array of linear electrodes, where each electrode pair extends from one edge of the plasma generation region to the opposite edge, secured by a dielectric support, and a method involving alternating voltages between electrodes to generate plasma, allowing for controlled plasma exposure and zone-based control to achieve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional plasma sources (CCP, ICP, microwave, ECR) are used, then plasma generation is achieved, but process uniformity across the substrate deteriorates due to edge effects from chamber walls
Solution Approach 1:
The plasma generation system is segmented into multiple independent linear plasma sources arranged in a one-dimensional array. Each linear source consists of parallel electrodes that generate plasma locally, and the collective array covers the entire substrate area. This segmentation allows independent control of plasma generation in different regions, enabling compensation for edge effects and achieving uniform plasma distribution across the substrate surface.
Solution Approach 2:
Each linear plasma source in the array is configured to generate plasma with locally optimized characteristics. The parallel electrodes of each source create a controlled plasma region with specific density and uniformity properties. By adjusting parameters of individual sources or groups of sources, the plasma quality can be locally optimized to compensate for position-dependent variations, particularly at substrate edges.
2Manufacturing precision
If complex plasma control schemes are implemented to improve uniformity, then process uniformity may improve, but device complexity and calibration requirements increase
Solution Approach 1:
The plasma generation system is divided into multiple independent linear sources that can be controlled individually or in groups. This segmentation transforms a complex two-dimensional uniformity control problem into a simpler one-dimensional control problem along the array direction, reducing the complexity of the control scheme while maintaining the ability to achieve uniform plasma distribution.
Solution Approach 2:
The linear plasma source design with parallel electrodes provides a universal building block that can be replicated and arranged in arrays for different substrate sizes and process requirements. The same basic source structure serves multiple functions: generating plasma, providing local uniformity, and enabling scalable array configurations, thereby simplifying the overall system complexity.
3Manufacturing precision
If extensive calibration is performed to achieve uniformity targets, then process uniformity improves, but processing time and operational complexity increase
Solution Approach 1:
The linear plasma sources are pre-configured with parallel electrodes and arranged in predetermined array patterns that inherently promote uniform plasma generation. This preliminary geometric configuration reduces the need for extensive post-installation calibration, as the system starts with built-in uniformity characteristics that require minimal adjustment to meet process specifications.
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 enhances plasma uniformity across substrates, simplifies control schemes, and improves process uniformity without the need for extensive calibration, effectively addressing radial and azimuthal non-uniformities through one-dimensional control and substrate rotation.
Implementation Method 1
providing a first voltage to a first electrode of a first pair of linear electrodes... providing a second voltage to a second electrode of the first pair of linear electrodes... Generating the plasma further includes providing a second voltage to a second electrode
Data Source
AI summary
A plasma generating component for a process chamber includes a first pair of linear electrodes. Each electrode of the first pair of linear electrodes extends from a first edge of a plasma generating region of the plasma generating component to a second edge of the plasma generating region of the plasma generating component. Electrodes of the first pair of linear electrodes are substantially parallel. The plasma generating component further includes a second pair of linear electrodes, substantially parallel to the first pair of linear electrodes. The plasma generating component further includes a dielectric support to which the first pair of linear electrodes and the second pair of linear electrodes are secured.