Electrode Shape Variation Detection in Plasma Processing
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Solution Overview
Problem
Conventional substrate processing apparatuses lack effective means to detect shape variations of discharge electrodes, leading to non-uniform plasma generation and subsequent film thickness issues on substrates.
Innovation Solution
Incorporating a monitoring system that measures and compares the resonance frequency of electrodes with a preset threshold, generating an alarm signal if the frequency exceeds the threshold, to detect shape variations and prevent non-uniform film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If discharge electrodes are vertically extended to generate plasma uniformly, then plasma uniformity is improved, but electrode shape stability deteriorates due to thermal expansion and shrinkage
Solution Approach 1:
The monitoring system performs preliminary detection of electrode shape variations by measuring resonance frequency changes before film formation occurs. This allows early warning and correction of electrode deformation, preventing non-uniform film thickness while maintaining the vertical electrode configuration needed for uniform plasma generation.
Solution Approach 2:
The system establishes a feedback loop where resonance frequency measurements continuously monitor electrode shape, and this information feeds back to alert operators or control systems. This enables real-time detection and correction of thermal deformation, maintaining both plasma uniformity and electrode stability.
2Device complexity
If no monitoring system is installed to reduce device complexity, then device complexity is reduced, but detection capability of electrode shape variations is lost
Solution Approach 1:
The system replaces complex mechanical measurement systems with an electrical resonance frequency measurement approach. By measuring changes in the electrode's electrical resonance characteristics, the system indirectly detects shape variations without requiring direct physical measurement instruments, thus maintaining simplicity while enabling detection.
Solution Approach 2:
The resonance frequency serves as an intermediary parameter that links electrode shape to a measurable electrical property. Instead of directly measuring complex electrode geometry, the system measures the simpler electrical resonance frequency, which changes in response to shape variations, enabling indirect but effective detection.
3Measurement precision
If resonance frequency monitoring is added to detect electrode variations, then detection precision is improved, but device complexity increases
Solution Approach 1:
The monitoring system uses the existing discharge electrodes themselves as the sensing elements for resonance frequency measurement. The same electrodes that generate plasma also serve as the sensors for detecting their own shape variations, eliminating the need for separate sensing components and reducing overall system complexity while maintaining high measurement precision.
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
Enables early detection of electrode shape variations, ensuring uniform plasma generation and preventing the formation of films with non-uniform thickness on substrates, thereby improving semiconductor device manufacturing processes.
Implementation Method 1
at least one pair of electrodes installed in the process chamber and configured to receive high-frequency power to generate plasma that excites the gas supplied into the process chamber
Implementation Method 2
a monitoring system configured to monitor a variation of a resonance frequency of the at least one pair of electrodes and a shape variation of the at least one pair of electrodes
Data Source
AI summary
Provided are a substrate processing apparatus and a method of manufacturing a semiconductor device, in which shape variations of discharge electrodes can be early detected so as to prevent a film having a non-uniform thickness from being formed on a substrate. The substrate processing apparatus includes a process chamber configured to stack a plurality of substrates therein, a gas supply unit configured to supply gas to an inside of the process chamber, at least one pair of electrodes installed in the process chamber and configured to receive high-frequency power to generate plasma that excites the gas supplied to the inside of the process chamber, and a monitoring system configured to monitor a shape variation of the electrodes.