Epitaxial Chamber Cross Flow Gas Inlets
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Solution Overview
Problem
Conventional substrate processing methods, such as epitaxial deposition, often result in undesirable thickness and compositional non-uniformities, which become more pronounced at smaller critical dimensions and higher compositional loading, leading to defects and particle formation in the deposited layers.
Innovation Solution
The method involves a process chamber with a substrate support and multiple inlet ports providing process gases in different directions, with an azimuthal angle of up to 145 degrees between the gas flow directions, creating a flow interaction that helps in overcoming thickness and compositional non-uniformities, reducing defect formation, and allowing for tailored thickness, composition, and crystallinity of the deposited layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If process gases are flowed across the substrate surface in the same direction between inlet and exhaust ports, then the process is simple and temperature control is effective, but thickness and compositional non-uniformities occur in the deposited layer
Solution Approach 1:
The single gas flow path is segmented into multiple independent gas inlet ports, each capable of delivering process gases in different directions. This segmentation allows the gas flow to be divided and redirected to create more uniform deposition across the substrate surface, resolving the thickness non-uniformity issue while maintaining manageable system complexity through modular port design
Solution Approach 2:
The patent introduces asymmetric gas flow configuration by positioning inlet ports at different locations and orientations around the substrate. Specifically, inlet ports are arranged to create cross-flow patterns with azimuthal angles between 45-135 degrees, breaking the symmetric unidirectional flow of conventional designs. This asymmetric arrangement ensures more uniform gas distribution and deposition thickness across the substrate surface
2Manufacturing precision
If temperature control is used to control film thickness, then temperature management is straightforward, but compositional non-uniformities and defect formation occur
Solution Approach 1:
The patent changes the flow direction parameter of process gases by introducing multiple inlet ports with different azimuthal angles. This parameter change creates cross-flow interactions that enhance mixing and compositional uniformity across the substrate surface, reducing defects without requiring complex temperature management. The gas flow parameters (direction, velocity, distribution) are optimized to achieve uniform deposition while maintaining simpler temperature control
3Productivity
If higher compositional loading is used to achieve desired layer properties, then deposition efficiency improves, but non-uniformities and defect formation increase
Solution Approach 1:
The patent adds a spatial dimension to gas flow control by introducing multiple inlet ports positioned at different azimuthal angles around the substrate. This dimensional approach creates three-dimensional cross-flow patterns that enhance gas mixing and compositional uniformity. The multi-directional flow geometry allows higher compositional loading to be achieved uniformly across the substrate surface, improving both deposition efficiency and layer quality simultaneously
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
This approach effectively reduces thickness and compositional non-uniformities, minimizes defect formation, and enables precise control over the deposited layer's thickness, composition, and crystallinity, improving the overall quality of the epitaxial layers.
Implementation Method 1
In some processes, such as epitaxial deposition of a layer on a substrate, process gases may be flowed across a substrate surface
Data Source
AI summary
Methods and apparatus for processing a substrate are provided herein. In some embodiments, an apparatus for processing a substrate includes a process chamber having a substrate support disposed therein to support a processing surface of a substrate at a desired position within the process chamber; a first inlet port to provide a first process gas over the processing surface of the substrate in a first direction; a second inlet port to provide a second process gas over the processing surface of the substrate in a second direction different from the first direction, wherein an azimuthal angle measured between the first direction and the second direction with respect to a central axis of the substrate support is up to about 145 degrees; and an exhaust port disposed opposite the first inlet port to exhaust the first and second process gases from the process chamber.