Reactor Chamber Baffle Layout for Uniform Deposition Flow
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Solution Overview
Problem
In reaction chambers, uneven fluid flow distribution leads to non-uniform deposition on substrates due to an offset vacuum source position, causing more deposition on portions closer to the vacuum aperture.
Innovation Solution
A baffle is introduced in the reaction chamber to direct fluid flow uniformly by covering the vacuum aperture and providing alternative flow paths through baffle apertures, ensuring equal fluid distribution across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vacuum source is positioned offset from the center of the reaction chamber, then the vacuum source can be effectively connected to the reaction chamber volume, but the fluid flow becomes uneven causing non-uniform deposition on the substrate
Solution Approach 1:
A baffle structure is introduced as an intermediary component between the vacuum aperture and the reaction chamber volume. The baffle includes a baffle space with baffle apertures that mediate the fluid flow, redirecting it to achieve uniform distribution across the substrate while maintaining the offset vacuum source position for effective evacuation
2Manufacturing precision
If the vacuum source is positioned at the center of the reaction chamber, then uniform fluid flow and deposition may be achieved, but the vacuum source cannot be effectively connected to the reaction chamber volume
Solution Approach 1:
The baffle structure utilizes the vertical dimension by extending from the reaction chamber floor upward, creating a three-dimensional flow path through baffle apertures. This dimensional approach allows the vacuum source to remain offset while still achieving uniform fluid distribution across the substrate surface
3Device complexity
If no baffle is used, then the device complexity is low, but the fluid flow distribution is uneven leading to non-uniform deposition
Solution Approach 1:
The baffle structure segments the fluid flow path into distinct regions: the reaction chamber volume, the baffle space, and the vacuum aperture. By dividing the flow path and introducing controlled flow paths through baffle apertures, uniform distribution is achieved with a relatively simple added structure
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 baffle ensures substantially equal fluid flow and deposition uniformity across the substrate, reducing deviation to less than 8%, improving processing consistency.
Implementation Method 1
a vacuum source may be in fluid communication with the reaction chamber volume, causing fluids in the reaction chamber to flow out of the reaction chamber toward the vacuum source
Implementation Method 2
A baffle is introduced in the reaction chamber to direct fluid flow uniformly by covering the vacuum aperture and providing alternative flow paths through baffle apertures
Implementation Method 3
one or more reactant gases may be passed over a heated substrate, causing the deposition of a thin film of material on the substrate surface
Data Source
AI summary
A baffle for use in a reaction chamber may comprise a baffle first end, a baffle second end, and a baffle space enclosed by a baffle wall system and the reaction chamber floor, wherein the baffle first end may comprise a baffle aperture disposed therethrough configured to allow a fluid to flow from the reaction chamber volume into the baffle space through the baffle aperture and exit the baffle space through a vacuum aperture in the reaction chamber floor toward a vacuum source.