Self-Plasma Chamber Shielding for Contamination-Free Monitoring
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Solution Overview
Problem
The self-plasma chamber in semiconductor deposition processes is prone to contamination, which affects plasma discharge and measurement reliability, leading to incorrect readings and a shortened lifespan of the chamber.
Innovation Solution
An apparatus with a shielding means, such as a shield ring or baffle plate, is installed adjacent to the ground electrode in the self-plasma chamber to prevent contaminants generated by plasma collisions from reaching the discharge chamber and window, thereby reducing contamination and enhancing measurement reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a self-plasma chamber is connected to an exhaust pipe of a process chamber to monitor deposition processes, then real-time process monitoring capability is improved, but contamination of the self-plasma chamber occurs leading to reduced measurement precision
Solution Approach 1:
A shielding means (shield ring or baffle plate) is introduced as an intermediary component between the ground electrode and the discharge chamber. This shielding structure intercepts and blocks contaminants generated at the ground electrode from reaching the discharge chamber and window, while allowing plasma and measurement signals to pass through. The shielding means acts as a mediator that separates the contamination source from the sensitive measurement region, resolving the contradiction between maintaining monitoring capability and preventing contamination.
2Productivity
If the self-plasma chamber operates continuously to monitor deposition processes, then productivity is improved, but the lifespan of the chamber is shortened due to rapid contamination
Solution Approach 1:
The shielding means is installed in advance as a preventive measure against contamination. By positioning the shield ring or baffle plate adjacent to the ground electrode before operation begins, the system preemptively blocks the path of contaminants before they can reach and damage the discharge chamber and window. This preliminary protective action allows continuous operation without the chamber degrading rapidly, thus extending its operational lifespan while maintaining high productivity.
3Reliability
If no shielding means is installed, then device complexity is reduced, but contamination causes plasma discharge instability and incorrect measurements
Solution Approach 1:
Rather than protecting the entire self-plasma chamber system uniformly, the shielding means applies protection locally at the critical contamination source - the ground electrode region. The shield ring or baffle plate is positioned specifically where contaminants are generated and directed, creating a localized protective barrier. This targeted approach improves reliability by blocking contaminants at their source while adding minimal structural complexity, as the shielding component is a simple ring or plate rather than a complex 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
The shielding means effectively prevents contaminants from entering the discharge chamber and window, thereby extending the lifespan of the self-plasma chamber and improving measurement reliability by maintaining accurate signal transmission.
Implementation Method 1
an electromagnetic field generator that generates an electromagnetic field so that the contamination causing material introduced from the process chamber deviates from a straight path extending towards the window of the self-plasma chamber
Implementation Method 2
a plasma generating module provided to generate the plasma in the discharge chamber
Implementation Method 3
ground-electrode material, generated due to a sputtering phenomenon when a positive charge of the plasma generated from the self-plasma chamber collides with a ground electrode
Data Source
AI summary
The present invention relates to a technology for increasing the reliability of measurement by preventing the contamination of a self-plasma chamber provided in order to monitor a deposition operation performed in a process chamber, and has a shielding means capable of preventing an inflow of negative electrode material, which is generated by a sputtering phenomenon, into a discharge chamber when a positive charge of plasma, which is generated in the self-plasma chamber, collides with a negative electrode.