Multizone Resonating Structures for Uniform Plasma Processing
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Solution Overview
Problem
Plasma processing in semiconductor manufacturing faces challenges due to non-uniform electromagnetic fields, leading to inconsistent treatment of substrates, which affects the quality and uniformity of processes like etching and deposition.
Innovation Solution
The use of multizone resonating structures with individual resonating structures operating at specific frequencies, coupled through matching circuits and excitation hardware, to control the spatial profile of the electromagnetic field and enhance plasma uniformity by tuning resonant frequencies and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single electromagnetic field source is used in the plasma processing chamber, then the device complexity is low, but the plasma uniformity across the substrate deteriorates
Solution Approach 1:
The electromagnetic field generation system is segmented into multiple independent resonating structures (first resonating structure and second resonating structure), each capable of operating at different frequencies and creating distinct plasma zones. This segmentation allows independent control of electromagnetic fields in different spatial regions, enabling uniform plasma distribution across the substrate while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The resonating structures are arranged in a nested configuration where the first resonating structure is positioned within the plasma processing chamber and the second resonating structure surrounds it. This nested arrangement allows compact integration of multiple field generation zones without increasing overall device footprint, achieving uniform plasma coverage while controlling device complexity through space-efficient design
2Manufacturing precision
If multiple resonating structures are used to control electromagnetic field distribution, then the plasma uniformity improves, but the device complexity increases
Solution Approach 1:
Both the first and second resonating structures are designed with universal functionality to generate electromagnetic fields at their respective resonant frequencies, creating plasma zones that can be independently controlled. This multi-functionality allows a single apparatus to achieve uniform plasma distribution across different substrate regions without requiring entirely separate systems, thereby improving plasma uniformity while limiting the increase in device complexity
Solution Approach 2:
The resonating structures are designed with adjustable resonant frequencies, allowing dynamic tuning of the electromagnetic field distribution. This dynamic capability enables optimization of plasma uniformity for different processing conditions and substrate configurations, achieving high manufacturing precision while maintaining device complexity at acceptable levels through flexible, adaptive design
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 approach improves the uniformity of plasma treatment across substrates, enhancing the consistency and quality of processes such as etching and deposition by controlling the electromagnetic field distribution within the plasma processing chamber.
Implementation Method 1
a first resonating structure, the first resonating structure being coupled to a first RF generator through a first matching circuit; and a second resonating structure surrounding the first resonating structure, the second resonating structure being coupled to a second RF generator through a second matching circuit
Implementation Method 2
an electromagnetic wave radiated into a plasma chamber generates an electromagnetic field within the chamber. The generated electromagnetic field heats electrons in the chamber.
Implementation Method 3
The generated electromagnetic field heats electrons in the chamber. The heated electrons ignite a plasma that treats the substrate
Data Source
AI summary
An apparatus for plasma processing includes a first resonating structure and a second resonating structure. The first resonating structure is coupled to a first RF generator through a first matching circuit. The second resonating structure surrounds the first resonating structure. The second resonating structure is coupled to a second RF generator through a second matching circuit.