Roughened Exhaust Passage Insert for Plasma By-Product Capture
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Solution Overview
Problem
In plasma processing apparatuses, the adhesion of by-products to the inner wall surface of the exhaust passage reduces maintainability and operating rate, as they are difficult to remove efficiently.
Innovation Solution
A plasma processing apparatus is designed with a first adsorption member having a roughened surface along the inner wall of the exhaust passage, which captures by-products released during the plasma process, preventing them from adhering to the passage walls. The adsorption member is configured in a labyrinth structure with alternating planar portions to enhance capture efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a smooth inner wall surface is used in the exhaust passage, then gas flow is smooth and pressure loss is reduced, but by-products adhere to the wall surface reducing maintainability
Solution Approach 1:
The exhaust passage is designed with different surface properties in different regions: the upstream portion has a rough inner wall surface to adsorb by-products, while the downstream portion maintains a smooth surface for efficient gas flow. This local differentiation resolves the contradiction by placing adsorption function where it is needed most (upstream) while preserving flow efficiency in the downstream region.
Solution Approach 2:
The rough inner wall surface acts as an intermediary substance that captures by-products before they can adhere to the smooth downstream walls. This intermediary structure prevents the harmful adhesion effect while maintaining overall system productivity.
2Device complexity
If by-products are allowed to accumulate on the exhaust passage walls, then no additional components are needed, but maintenance time increases and operating rate decreases
Solution Approach 1:
The exhaust passage performs dual functions: it exhausts gas and simultaneously adsorbs by-products through its rough upstream surface. This self-service capability eliminates the need for separate adsorption components while maintaining high operating rates, resolving the contradiction between structural simplicity and productivity.
3Object-affected harmful factors
If a rough surface is applied throughout the exhaust passage to adsorb by-products, then by-product capture is enhanced, but gas flow resistance increases and pressure loss rises
Solution Approach 1:
The rough surface is applied only to the upstream portion of the exhaust passage where by-product concentration is highest, while the downstream portion maintains a smooth surface. This local application minimizes the total rough surface area, thereby reducing overall flow resistance and pressure loss while still achieving effective by-product capture.
Solution Approach 2:
Instead of applying rough surface treatment throughout the entire exhaust passage (excessive action), the invention applies it only to the necessary upstream portion (partial action), achieving sufficient by-product adsorption without the penalty of excessive flow resistance.
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 solution effectively suppresses the adhesion of by-products to the exhaust passage walls, improving maintainability and operating efficiency by ensuring efficient capture and removal of by-products during the plasma processing.
Implementation Method 1
a surface of the first adsorption member is roughened to adsorb the by-product
Data Source
AI summary
A plasma processing apparatus includes: a processing container in which a mounting stage mounted with a substrate is provided and a plasma process is performed on the substrate; an exhaust passage which is provided around the mounting stage and through which a gas containing a by-product released by the plasma process flows; and a first adsorption member which is arranged along an inner wall surface of the exhaust passage and of which a surface is roughened to adsorb the by-product.