Coil Antenna Assembly Plasma Ignition Control
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Solution Overview
Problem
In semiconductor substrate processing, precise control of plasma ignition is challenging due to difficulties in initiating plasma in certain processing chambers, often resulting in arcing, sputtering of chamber components, and increased defect rates.
Innovation Solution
An improved coil antenna assembly with an electrode assembly that enhances plasma ignition within the processing chamber by applying higher voltage proximate to the lid, reducing the need for power spikes and minimizing sputtering, while maintaining effective plasma generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power spikes are used to ignite gases in processing chambers, then plasma ignition is achieved, but arcing and sputtering of chamber components occur which diminish service life and generate particles
Solution Approach 1:
A dielectric member is introduced as an intermediary between the coil antenna assembly and the chamber components. This dielectric barrier prevents direct electrical contact and eliminates arcing and sputtering while still allowing plasma ignition to occur through the dielectric material, thus resolving the contradiction between reliable plasma ignition and prevention of harmful arcing damage
Solution Approach 2:
The system changes the electrical parameters by introducing a dielectric barrier that modifies the voltage distribution and electrical field characteristics. This allows plasma ignition to occur at lower power levels without the harmful effects of high-power spikes, transforming the ignition mechanism from direct high-power contact to controlled dielectric breakdown
2Manufacturing precision
If tighter tolerances and precise process control are implemented for shrinking geometries, then fabrication success is improved, but critical dimension and etch process control becomes increasingly difficult
Solution Approach 1:
The coil antenna assembly is designed with non-uniform winding distribution, creating localized regions of different electromagnetic field strength. This local quality variation enables precise control of plasma density and reaction rates at specific locations within the chamber, allowing tight tolerances to be maintained even as geometries shrink and process control becomes more challenging
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 enables enhanced plasma ignition without increasing power or causing sputtering of chamber components, leading to improved device yield and more uniform plasma distribution for consistent and reproducible semiconductor fabrication results.
Implementation Method 1
a coil antenna assembly positioned adjacent the lid for coupling RF power to the chamber body
Implementation Method 2
The electrode assembly takes the voltage of the first end of the coil and provides a higher voltage proximate the lid of the processing chamber
Implementation Method 3
The plasma may be easily ignited in processing chambers that utilized capacitively coupled power to energize the gases forming the plasma
Data Source
AI summary
Embodiments of an apparatus having an improved coil antenna assembly that can provide enhanced plasma in a processing chamber is provided. The improved coil antenna assembly enhances positional control of plasma location within a plasma processing chamber, and may be utilized in etch, deposition, implant, and thermal processing systems, among other applications where the control of plasma location is desirable. In one embodiment, an electrode assembly configured to use in a semiconductor processing apparatus includes a RF conductive connector, and a conductive member having a first end electrically connected to the RF conductive connector, wherein the conductive member extends outward and vertically from the RF conductive connector.