Dual-RF Electrode Plasma Processing for Stable Continuous Etching
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Solution Overview
Problem
Conventional plasma processing machines with a single radio frequency power source are unable to stabilize plasma effectively between electrodes, leading to instability and potential damage to the to-be-processed object, especially during processes requiring higher energy like etching or sputtering.
Innovation Solution
A two-electrode continuous plasma processing system is introduced, featuring separate radio frequency power sources for each electrode to control plasma density and ion energy, along with a clamping device and moving mechanism to securely position the to-be-processed object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single radio frequency power source is used to supply energy to one electrode, then the device complexity is reduced, but the plasma stability deteriorates and the processing capability for high energy requirements is insufficient
Solution Approach 1:
The single radio frequency power source is segmented into two separate power sources, each independently controlling one electrode. This segmentation allows independent optimization of plasma density and ion energy, resolving the contradiction between device simplicity and plasma stability by enabling separate control of plasma parameters without requiring a single complex power source.
Solution Approach 2:
The invention changes the control parameters by introducing two independent radio frequency power sources that can independently adjust plasma density and ion energy. This parameter change enables precise control over plasma characteristics, improving plasma stability and processing capability while maintaining reasonable device complexity through independent parameter optimization.
2Reliability
If the plasma matching process takes a certain time duration, then the plasma can be stabilized, but the production efficiency is reduced due to extended stable duration
Solution Approach 1:
The two separate radio frequency power sources enable preliminary independent adjustment of plasma parameters before the actual processing begins. By pre-stabilizing plasma density and ion energy independently through separate power sources, the system reduces the plasma matching time during production, thereby improving productivity while maintaining plasma stability.
Solution Approach 2:
The independent dual power source configuration allows continuous useful action by eliminating the plasma instability period that would otherwise require process interruption. Both electrodes can be powered simultaneously with independently optimized parameters, maintaining continuous stable plasma without the matching delays that reduce productivity.
3Productivity
If the plasma is unstable during the matching process, then the overall production progress is affected, but increasing the stable duration increases the damage risk to the to-be-processed object
Solution Approach 1:
The independent dual radio frequency power source system implements feedback control by separately monitoring and adjusting plasma parameters from each electrode. This feedback mechanism quickly detects and corrects plasma instability, reducing both the duration of harmful unstable periods and the risk of object damage, thereby protecting productivity and object safety simultaneously.
Solution Approach 2:
The system applies preliminary anti-action by using the second radio frequency power source to pre-establish stable plasma conditions before the full processing begins. This preliminary stabilization prevents the harmful effects of plasma instability from affecting the to-be-processed object, reducing damage risk while maintaining production progress.
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 system efficiently stabilizes plasma between the electrodes, reducing the risk of damage to the processed object and ensuring consistent production by maintaining plasma stability and matching within a shorter time frame.
Implementation Method 1
The first radio frequency power source is coupled with the first electrode and provides the first electrode with a first radio frequency energy to control a density of a plasma
Implementation Method 2
The second radio frequency power source is coupled with the second electrode and provides the second electrode with a second radio frequency energy to control an ionic energy of the plasma
Implementation Method 3
carrying out the plasma process of a to-be-processed object, such as a die, to-be-coated object, or to-be-etched object
Data Source
AI summary
A two-electrode continuous plasma processing system includes a processing chamber having a clamping device, a moving device, a first and a second electrodes, and a first and a second radio frequency power sources. When an object moves into a processing space of the processing chamber, the moving device controls the second electrode to drive the object to move toward the first electrode, and actuates the second electrode and the clamping device to clamp and fix the object. The first radio frequency power source provides the first electrode with a first radio frequency energy to control the density of plasma. The second radio frequency power source provides the second electrode with a second radio frequency energy to control the ion energy of the plasma. Therefore, the plasma is efficiently stabilized, lowering the probability of object damage.