Showerhead Electrode Mixed Acid Cleaning via Pressurized Gas Dispersion
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Solution Overview
Problem
Current methods for cleaning showerhead electrodes in plasma processing systems are inefficient in removing contaminants from the gas passages, leading to suboptimal electrode performance and potential damage over time.
Innovation Solution
A mixed acid cleaning assembly is used, which includes a modular electrode sealing housing with separate cleaning volumes for acidic solutions and purified water, utilizing gas and liquid dispersion members to pressurize and direct the cleaning agents through the electrode's gas passages, ensuring thorough cleaning and rinsing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cleaning methods are used for showerhead electrodes, then the cleaning process is simple, but the effectiveness of removing contaminants from gas passages is insufficient
Solution Approach 1:
The cleaning assembly is divided into separate cleaning volumes (first cleaning volume for acidic solution, second cleaning volume for purified water) that can independently process different aspects of contamination removal. This segmentation allows each volume to be optimized for its specific cleaning function while working together to achieve comprehensive cleaning effectiveness.
Solution Approach 2:
The system utilizes pressurized gas flow through the first cleaning volume to force acidic solution through the gas passages, and pressurized liquid flow through the second cleaning volume to rinse the electrode. This pneumatic and hydraulic approach ensures thorough penetration of cleaning agents through complex passage geometries, significantly improving contaminant removal effectiveness.
2Reliability
If acidic solution is forced through gas passages to clean them thoroughly, then passage cleaning effectiveness improves, but the risk of electrode damage increases
Solution Approach 1:
The acidic solution cleaning step is performed as a preliminary action before the rinsing step. By first forcing the acidic solution through the gas passages to dissolve and remove contaminants, then immediately followed by purged gas flow and purified water rinsing, the system achieves thorough cleaning while preventing acid residue damage to the electrode.
Solution Approach 2:
Purged gas acts as an intermediary between the acidic solution cleaning step and the purified water rinsing step. The purged gas flow forces remaining acidic solution through the passages and removes it from the electrode surface, serving as a protective intermediary that prevents direct contact between prolonged acid exposure and the electrode material.
3Manufacturing precision
If separate cleaning volumes are used for acidic solution and purified water, then cleaning precision and control improve, but the device complexity increases
Solution Approach 1:
The cleaning assembly is segmented into distinct first and second cleaning volumes with separate fluid pathways. The first cleaning volume receives and processes acidic solution through gas dispersion members, while the second cleaning volume receives and directs purified water through liquid dispersion members. This segmentation provides precise control over each cleaning stage while maintaining a manageable overall structure.
Solution Approach 2:
The cleaning assembly structure serves multiple functions: it contains separate cleaning volumes for different chemicals, provides pathways for gas and liquid flow, supports dispersion members for both gas and liquid phases, and enables sequential processing steps. This multi-functionality is achieved within a unified assembly design that avoids excessive complexity.
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 method effectively cleans and refurbishes showerhead electrodes by ensuring thorough passage cleaning, reducing contamination and extending the electrodes' lifespan while maintaining their functionality.
Implementation Method 1
The first cleaning volume on the first side of the showerhead electrode can be pressurized such that at least a portion of the acidic solution flows through one or more of the plurality of gas passages of the showerhead electrode
Implementation Method 2
An amount of purified water can be propelled through the second cleaning volume on the second side of the showerhead electrode, and into contact with the second side of the showerhead electrode
Data Source
AI summary
In one embodiment, a method for cleaning a showerhead electrode my include sealing a showerhead electrode within a cleaning assembly such that a first cleaning volume is formed on a first side of the showerhead electrode and a second cleaning volume is formed on a second side of the showerhead electrode. An acidic solution can be loaded into the first cleaning volume on the first side of the showerhead electrode. The first cleaning volume on the first side of the showerhead electrode can be pressurized such that at least a portion of the acidic solution flows through one or more of the plurality of gas passages of the showerhead electrode. An amount of purified water can be propelled through the second cleaning volume on the second side of the showerhead electrode, and into contact with the second side of the showerhead electrode.