SiC Wafer Growth Support Layout for Uniform Gas Flow
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Solution Overview
Problem
The manufacturing of silicon-carbide wafers is complex, and existing methods face challenges such as non-uniform growth, adhesion of silicon to susceptor arms, and the formation of polycrystalline edges due to temperature gradients caused by unstable gas flow in the reaction chamber.
Innovation Solution
The apparatus features a support with arms arranged at a lower level than the frame, allowing the initial silicon wafer to be positioned with its top surface aligned with the frame, promoting a more uniform gas flow and temperature distribution, which stabilizes the growth process and reduces adhesion issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the silicon substrate is positioned on cantilevered arms extending from the frame, then the substrate can be supported during growth, but the arms block part of the reaction chamber and cause unstable gas flow
Solution Approach 1:
The support structure transitions from a two-dimensional planar arrangement to a three-dimensional configuration by positioning the support surface at a lower level than the frame. This vertical displacement allows gas to flow uniformly across the reaction chamber without being blocked by the arms, resolving the contradiction between substrate support and gas flow stability.
2Device complexity
If the support surface is at the same level as the frame, then the structure is simple, but temperature gradient causes polycrystalline edges
Solution Approach 1:
By positioning the support surface at a lower level than the frame, the invention creates a three-dimensional configuration that eliminates temperature gradients across the wafer. This vertical displacement allows uniform heat distribution and stable gas flow, preventing polycrystalline edge formation while maintaining manufacturing precision.
3Ease of operation
If the silicon substrate projects from the support, then it is easy to position, but it causes instability in growth gas flow
Solution Approach 1:
The invention positions the support surface at a lower level than the frame, creating a three-dimensional arrangement where the substrate does not project horizontally. This vertical configuration eliminates gas flow instability caused by horizontal projection while maintaining ease of substrate positioning and improving growth process reliability.
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 configuration enables the growth of large, monocrystalline silicon-carbide wafers without polycrystalline edges, improving the reliability and completeness of the wafer detachment process, allowing for the production of wafers up to 12 inches in diameter.
Implementation Method 1
growing a 3C—SiC epitaxial layer on the silicon substrate, and then separating the silicon substrate from the 3C—SiC epitaxial layer by melting the silicon substrate
Implementation Method 2
growing a 3C—SiC epitaxial layer on the silicon substrate
Data Source
AI summary
An apparatus for growing semiconductor wafers, in particular of silicon carbide, wherein a chamber houses a collection container and a support or susceptor arranged over the container. The support is formed by a frame surrounding an opening accommodating a plurality of arms and a seat. The frame has a first a second surface, opposite to each other, with the first surface of the frame facing the support. The arms are formed by cantilever bars extending from the frame into the opening, having a maximum height smaller than the frame, and having at the top a resting edge. The resting edges of the arms define a resting surface that is at a lower level than the second surface of the frame. The seat has a bottom formed by the resting surface.