Phased Array Plasma Scanning for Uniform Wafer Processing
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Solution Overview
Problem
Existing plasma processing technologies face inefficiencies in controlling plasma density distribution and scanning patterns, leading to non-uniform processing results and resource wastage due to trial-and-error methods and machine asymmetries.
Innovation Solution
A scanning-type plasma processing apparatus using a phased array antenna that observes plasma light emission through multiple observation windows, calculates in-plane plasma characteristics, and adjusts power and phase output to correct plasma density distribution and scanning patterns using optical emission spectroscopy and the Markov chain Monte Carlo method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If trial-and-error methods are used to control plasma density distribution, then processing results can be achieved, but resource wastage occurs and processing efficiency decreases
Solution Approach 1:
The system implements real-time feedback control by observing plasma light emission through multiple observation windows, calculating in-plane plasma characteristics, and using this information to dynamically adjust the phased array antenna parameters. This closed-loop feedback mechanism eliminates trial-and-error methods by continuously monitoring and correcting plasma density distribution during processing.
Solution Approach 2:
The system performs preliminary calculation of in-plane plasma characteristics based on observed light emission data before adjusting the scanning pattern and plasma density distribution. This preliminary analysis allows the system to predict and correct non-uniformities in advance, preventing resource wastage rather than correcting it after the fact.
2Manufacturing precision
If conventional plasma processing is used without real-time observation, then device complexity is lower, but manufacturing precision of plasma density distribution deteriorates
Solution Approach 1:
The system introduces light emission observation as an intermediary measurement method to indirectly assess plasma density distribution. By observing optical emissions rather than directly measuring plasma parameters, the system achieves high precision control while avoiding the complexity of direct plasma diagnostics. The light emission serves as a mediator that translates plasma state into measurable optical signals.
Solution Approach 2:
The system replaces complex mechanical or direct electrical plasma measurement systems with optical observation methods. By using light emission spectroscopy through observation windows, the system achieves precise plasma characterization without the complexity of intrusive probes or direct electromagnetic field measurements, substituting optical detection for traditional plasma diagnostics.
3Measurement precision
If phased array antenna with multiple observation windows is implemented, then plasma density control precision is improved, but device complexity increases
Solution Approach 1:
The system divides the observation function into multiple segments by placing observation windows at multiple positions around the processing container. Each window provides localized plasma characteristic data, and the system integrates these segmented measurements to reconstruct the complete in-plane plasma density distribution. This segmentation approach improves measurement precision while distributing system complexity across multiple simple observation points rather than requiring a single complex measurement system.
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 enables precise control of plasma density distribution, reduces resource consumption, and improves processing uniformity by minimizing standard deviation in plasma density, thus enhancing film forming and etching rates without extensive substrate testing.
Implementation Method 1
a plasma processing apparatus that performs plasma processing on a wafer by converting gas into plasma with the power of electromagnetic waves
Implementation Method 2
observing light emission of plasma generated inside a processing container through observation windows provided at multiple positions in the processing container
Data Source
AI summary
A method of controlling a scanning-type plasma processing apparatus using a phased array antenna, includes observing light emission of plasma generated inside a processing container through observation windows provided at multiple positions in the processing container, calculating an in-plane distribution of values representing characteristics of the plasma on a substrate, based on data on the observed light emission of the plasma, and correcting a scanning pattern and/or a plasma density distribution of the plasma based on the calculated in-plane distribution of the values representing the characteristics of the plasma on the substrate.