Composite Wafer Carrier Layer for Heat-Stable Bend Control
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Solution Overview
Problem
Conventional semiconductor wafers experience high mechanical bending due to intrinsic compressive and tensile stresses, making further processing challenging and increasing the risk of breakage. Additionally, conventional carrier layers can distort during heat treatment, affecting the properties of the semiconductor wafer.
Innovation Solution
A carrier layer comprising a matrix structure and an ellipsoid structure embedded in the matrix structure, where the materials and structures are designed to control material distortion during heat treatment, providing stability and reducing mechanical bending in semiconductor wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional carrier layer is applied to the semiconductor wafer, then mechanical stability is improved and bending is reduced, but the carrier layer distorts during heat treatment which negatively affects wafer properties
Solution Approach 1:
The carrier layer is constructed as a composite material consisting of a matrix structure and embedded ellipsoid structures with different material properties. The matrix provides mechanical stability and binding, while the ellipsoid inclusions with higher thermal expansion compensate for thermal distortion during heat treatment, thereby maintaining dimensional accuracy while preserving mechanical stability.
Solution Approach 2:
The ellipsoid structures are strategically embedded within the matrix at specific locations and orientations. By controlling the local distribution, shape, and material composition of the ellipsoid inclusions, the carrier layer achieves differential thermal expansion characteristics in different regions, allowing precise control over overall dimensional stability during heat treatment while maintaining uniform mechanical support.
2Manufacturing precision
If the semiconductor wafer undergoes thin grinding and etching processes, then the substrate layer is thinned to desired specifications, but intrinsic compressive and tensile stresses cause high mechanical bending
Solution Approach 1:
The carrier layer with its composite matrix-ellipsoid structure is applied to the semiconductor wafer before thin grinding and etching processes. This preliminary application provides mechanical support that counteracts the intrinsic stresses generated during subsequent processing, preventing bending from occurring in the first place rather than attempting to correct it afterward.
Solution Approach 2:
The composite structure of the carrier layer, combining a flexible matrix with stiffer ellipsoid inclusions, creates a mechanically robust support system that can accommodate the stress variations introduced during thin grinding and etching while maintaining wafer flatness and preventing excessive bending.
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 carrier layer effectively reduces mechanical bending and stabilizes the semiconductor wafer during processing, while minimizing distortion during heat treatment, thus enhancing the wafer's properties and processing feasibility.
Implementation Method 1
The ellipsoid structure can have a greater thermal expansion than the matrix structure
Data Source
AI summary
A carrier layer for a semiconductor wafer with a matrix structure and an ellipsoid structure embedded in the matrix structure. A method for applying such a carrier layer to a semiconductor wafer.