Antenna Current Direction for Plasma Uniformity
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Solution Overview
Problem
Plasma processing devices face challenges in achieving uniform characteristics such as internal electromagnetic fields, temperature, and gas flow as the size of target substrates increases, leading to inconsistent plasma processes.
Innovation Solution
The plasma processing device incorporates a chamber design with dielectric windows, a lid frame, supporting bars, and antennas with specific current directions to enhance electromagnetic field distribution, along with strategically positioned injection and exhaust ports, and cooling channels to maintain uniform plasma processing across large substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the chamber size is increased to accommodate larger target substrates, then the processing area is improved, but the uniformity of internal electromagnetic field, temperature, and gas flow deteriorates
Solution Approach 1:
The patent divides the single large chamber into multiple zones by strategically positioning multiple antennas (first, second, third, and fourth antennas) at different locations. Each antenna independently generates electromagnetic fields that collectively cover the entire large processing area, ensuring uniform plasma distribution across the segmented zones.
Solution Approach 2:
The patent combines multiple electromagnetic field sources (antennas) with different current directions to create a unified uniform plasma field. The first and second antennas with first current direction, and third and fourth antennas with second current direction, work together to merge their individual field contributions into a consistent plasma processing environment across the large substrate area.
2Manufacturing precision
If multiple antennas with different current directions are used to improve electromagnetic field distribution, then the uniformity of plasma process is improved, but the device complexity increases
Solution Approach 1:
The patent employs asymmetric antenna configuration where antennas are positioned at different locations (inside/outside supporting bars area) with different current directions. This asymmetric arrangement is specifically designed to compensate for the non-uniform electromagnetic field distribution that would naturally occur in a large chamber, creating uniform plasma through deliberate asymmetric field generation.
Solution Approach 2:
The patent uses dynamic control of antenna current directions to adaptively manage electromagnetic field distribution. By switching between first and second current directions in different antenna groups, the system dynamically adjusts the field configuration to maintain uniform plasma across the large processing area under varying operating conditions.
3Productivity
If the chamber volume is increased to process larger substrates, then the productivity is improved, but the temperature uniformity and gas flow characteristics deteriorate
Solution Approach 1:
The patent segments the large chamber volume into multiple controlled zones using multiple antennas positioned at different heights and locations. Each antenna zone independently manages local temperature and gas flow characteristics, allowing the entire large volume to maintain uniform plasma processing conditions despite the increased chamber size.
Solution Approach 2:
The patent introduces vertical dimensionality by positioning antennas at different heights (above dielectric windows at different levels) to create three-dimensional electromagnetic field distribution. This multi-dimensional approach ensures uniform energy coupling and temperature distribution throughout the large chamber volume, preventing hot spots and maintaining consistent plasma conditions.
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 ensures a uniform plasma process on large target substrates by optimizing electromagnetic field resonance, gas flow, and temperature distribution, thereby improving manufacturing efficiency and reducing costs.
Implementation Method 1
optimizing electromagnetic field resonance
Implementation Method 2
a plurality of antennas positioned above the dielectric windows... having a loop form, and a first current direction in the first antenna and a second current direction in the second antenna are the same as each other
Data Source
AI summary
A plasma processing device including a chamber, a plurality of dielectric windows covering a top portion of the chamber, a lid frame supporting the dielectric windows on a same plane, a plurality of supporting bars supporting a top portion of the lid frame, and a plurality of antennas positioned above the dielectric windows, in which the antennas include a first antenna positioned inside an area defined by the supporting bars and having a loop form, and a second antenna positioned outside the area defined by the supporting bars and having a loop form, and a first current direction in the first antenna and a second current direction in the second antenna are the same as each other.