Semiconductor Gas Mixing Block for Uniform CVD Gas Distribution
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Solution Overview
Problem
Existing gas mixing systems for semiconductor fabrication lack efficient control over the mixing of gases, particularly in chemical vapor deposition (CVD) systems, which can result in uneven distribution of mixed gases on semiconductor wafers.
Innovation Solution
A gas mixing system with a mixing block that includes a gas mixing chamber, a first gas channel fluidly coupled to the chamber at a first exit location, and a second gas channel fluidly coupled to the chamber at a second exit location, where the first exit location is diametrically opposite the second exit location, allowing for controlled mixing of gases by varying the shape and configuration of the gas channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional gas mixing systems are used, then the system structure is simple, but the gas mixing uniformity is poor
Solution Approach 1:
The gas mixing system is divided into separate functional modules: individual gas channels for each gas source, a central mixing chamber, and multiple outlet positions. This segmentation allows precise control of each gas stream while maintaining overall system simplicity through modular architecture.
Solution Approach 2:
The patent introduces a rotational dimension by rotating the mixing chamber relative to the substrate. This allows the single mixing chamber to serve multiple outlet positions (first, second, third, and fourth positions) around the substrate, achieving uniform gas distribution across different locations without requiring separate mixing chambers for each position.
2Manufacturing precision
If gas channels are added to control mixing, then the gas distribution uniformity improves, but the device complexity increases
Solution Approach 1:
Different gas channels are designed with specific local characteristics (different shapes, sizes, and configurations) optimized for their respective gases. Each gas channel has tailored properties to control the flow and mixing characteristics of its specific gas, while the overall system remains manageable through this localized optimization approach.
3Measurement precision
If multiple gas channels are used for precise mixing control, then the mixing precision improves, but the system complexity increases
Solution Approach 1:
The mixing chamber is designed to be rotatable, introducing dynamic control to the gas mixing process. By rotating the mixing chamber to different positions relative to the substrate, the system can precisely control which mixed gas composition is delivered to which location, enabling spatially-resolved precise mixing control without requiring static complex multi-chamber configurations.
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 achieves precise control over the mixing of gases, ensuring a uniform distribution of the mixed gas over semiconductor wafers, thereby enhancing the quality and consistency of semiconductor fabrication processes.
Implementation Method 1
a first gas channel fluidly coupled to the gas mixing chamber at a first exit location, and a second gas channel fluidly coupled to the gas mixing chamber at a second exit location
Implementation Method 2
The diametrically opposite arrangement causes a first gas from the first gas channel and a second gas from the second gas channel to meet head on or at an angle of 180 degrees in the gas mixing chamber to encourage mixing of the first gas and the second gas
Implementation Method 3
to encourage mixing of the first gas and the second gas
Data Source
AI summary
A gas mixing system for semiconductor fabrication includes a mixing block. The mixing block defines a gas mixing chamber, a first gas channel fluidly coupled to the gas mixing chamber at a first exit location, and a second gas channel fluidly coupled to the gas mixing chamber at a second exit location, wherein the first exit location is diametrically opposite the second exit location relative to the gas mixing chamber and the second gas channel has a bend of 90 degrees or less between an entrance of the second gas channel and the second exit location.