Multi-Layer Insulating Structure for Wafer Warpage Control
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Solution Overview
Problem
Large substrates used in electronic device manufacturing often warp due to material or structural issues in the redistribution layer, affecting production yield.
Innovation Solution
A multi-layer insulating structure with differing Young's moduli is introduced between the wafer and the redistribution layer to mitigate warpage, comprising a first layer with a higher Young's modulus than the second layer, which is formed on a carrier before the redistribution layer is applied, reversing the warpage trend.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redistribution layer is formed on a large substrate, then the electronic device functionality is achieved, but the substrate warps due to material or structural issues
Solution Approach 1:
The patent applies preliminary anti-action by forming a compensation layer on the substrate before forming the redistribution layer. This compensation layer is specifically designed to generate a counteracting warpage that opposes the warpage caused by the subsequent redistribution layer formation. The compensation layer's material composition and thickness are carefully controlled to create an equal and opposite deformation, thereby preventing net warpage in the final structure and improving production yield.
Solution Approach 2:
The patent employs composite materials by creating a multi-layer structure consisting of the substrate, compensation layer, and redistribution layer. Each layer has different material properties, particularly in terms of Young's modulus and thermal expansion coefficients. The compensation layer uses a material with specific mechanical properties that differ from both the substrate and redistribution layer, allowing it to act as a mechanical buffer that counteracts warpage through controlled stress distribution across the composite structure.
2Productivity
If the entire substrate is used for manufacturing, then production efficiency is improved, but warpage occurs affecting production yield
Solution Approach 1:
The patent applies segmentation by dividing the substrate structure into distinct functional layers: the base substrate, the compensation layer, and the redistribution layer. This segmentation allows each layer to be independently optimized for its specific function. The compensation layer is segmented as a separate entity with controlled material properties and thickness, enabling it to specifically address warpage issues without affecting the overall production efficiency of using large substrates.
3Shape
If a multi-layer insulating structure with different Young's moduli is introduced, then warpage is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by introducing a compensation layer with specific, localized material properties between the substrate and redistribution layer. The compensation layer has deliberately different Young's modulus and thickness compared to other layers, creating a localized region with tailored mechanical properties. This local modification allows warpage control without requiring complex changes to the entire device structure, maintaining relative simplicity while achieving the desired flatness.
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 warpage in the package structure, improving production yield by counteracting the warpage caused by the redistribution layer formation.
Implementation Method 1
The multi-layer insulating structure includes a first layer and a second layer, where a Young's modulus of the first layer is different from a Young's modulus of the second layer
Data Source
AI summary
An electronic device includes a wafer, a redistribution layer and a multi-layer insulating structure. The redistribution layer is disposed on the wafer. The multi-layer insulating structure is disposed between the wafer and the redistribution layer. The multi-layer insulating structure includes a first layer and a second layer. A Young's modulus of the first layer is different from a Young's modulus of the second layer.