Integrated Steerability Array for Plasma Uniformity
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Solution Overview
Problem
Plasma processing systems face challenges in achieving uniform conditions within the processing chamber, leading to non-uniformity in substrate processing, which is difficult to control with existing technologies like transformer coupled plasma sources due to radial gas flow and uneven gas exhaust.
Innovation Solution
An integrated steerability array arrangement is implemented, comprising arrays of electrical elements, gas injectors, and pumps, allowing for local control of power, gas flow, and gas exhaust to create self-similar plasma regions and maintain a uniform processing environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a transformer coupled plasma source is used to create a toroidal processing region, then plasma uniformity is improved, but chamber size and dielectric window size must be significantly increased
Solution Approach 1:
The processing chamber is divided into multiple independently controllable zones with separate gas injectors and pumps, allowing local plasma uniformity control without requiring a large toroidal chamber. Each zone can be optimized independently to achieve overall uniformity.
Solution Approach 2:
Different regions of the substrate are treated with locally optimized gas flow and plasma parameters through dedicated gas injectors and pumps positioned at specific locations, enabling uniform processing without a large chamber volume.
2Productivity
If gas is pumped out from the center to the edge of the substrate, then gas exhaust is achieved, but non-uniform gas distribution across the substrate surface results
Solution Approach 1:
The gas exhaust system is segmented into multiple independent pump stations positioned at different locations around the substrate, allowing simultaneous exhaust from multiple zones to maintain uniform gas distribution while achieving high exhaust efficiency.
Solution Approach 2:
Each pump is positioned to service specific zones with locally optimized exhaust rates, creating uniform gas distribution across the substrate surface while maintaining high overall exhaust efficiency through coordinated operation of multiple pumps.
3Productivity
If radial gas flow is used in the processing chamber, then plasma generation is facilitated, but non-uniform gas distribution and plasma conditions occur
Solution Approach 1:
The plasma generation system is divided into multiple independent plasma regions, each with its own gas injector and pump, allowing local optimization of plasma uniformity while maintaining efficient plasma generation through coordinated operation of all regions.
Solution Approach 2:
Gas flow and plasma parameters are locally optimized in each zone through dedicated gas injectors positioned to create uniform plasma conditions in their respective regions, achieving overall plasma uniformity without sacrificing generation efficiency.
4Manufacturing precision
If a larger toroidal processing region is created to improve plasma uniformity, then processing uniformity is enhanced, but chamber and dielectric window size must be significantly increased
Solution Approach 1:
The processing area is segmented into multiple zones that can be independently controlled and optimized, achieving uniform processing conditions across the substrate without requiring a large single toroidal processing region and its associated large dielectric window.
Solution Approach 2:
Each zone has locally optimized processing parameters and gas flow conditions, allowing uniform processing to be achieved across the entire substrate area without the need for a large toroidal chamber and large dielectric window.
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 enables precise and accurate substrate processing by ensuring uniform plasma distribution across the substrate, reducing defects and costs associated with larger chamber designs.
Implementation Method 1
an array of electrical elements and an array of gas injectors are arranged to create a plurality of plasma regions
Implementation Method 2
an array of electrical elements and an array of gas injectors are arranged to create a plurality of plasma regions
Implementation Method 3
an array of pumps is provided, wherein individual one of the array of pumps being interspersed among the array of electrical elements and the array of gas injectors
Data Source
AI summary
A method for providing steerability in a plasma processing environment during substrate processing is provided. The method includes managing, power distribution by controlling power being delivered into the plasma processing environment through an array of electrical elements. The method also includes directing gas flow during substrate processing by controlling the amount of gas flowing through an array of gas injectors into the plasma processing environment, wherein individual ones of the array of gas injectors are interspersed between the array of electrical elements. The method further includes controlling gas exhausting during substrate processing by managing amount of gas exhaust being removed by an array of pumps, wherein the array of electrical elements, the array of gas injectors, and the array of pumps are arranged to create a plurality of plasma regions, each plasma region being substantially similar, thereby creating a uniform plasma region across the substrate.