Dual-Side Reinforcement Underfill for Semiconductor Packaging
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Solution Overview
Problem
Conventional thermosetting polymer-based underfill materials in semiconductor packaging are sensitive to room temperature, leading to pre-curing issues and viscosity buildup, requiring separate curing processes and storage below -4°C, which complicates processing and stability.
Innovation Solution
A dual-side reinforcement material comprising a mixture of resin, hardener, catalyst, and additives, stable at room temperature, that undergoes cross-linking during reflow processes to act as an underfill material, eliminating the need for additional curing and providing enhanced mechanical and drop shock properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional thermosetting polymer-based underfill materials are used, then mechanical properties and drop shock resistance are achieved, but room temperature stability deteriorates due to pre-curing and viscosity buildup
Solution Approach 1:
The patent changes the chemical composition parameters of underfill materials by formulating a dual-component system (Component A: epoxy resin with specific molecular weight and structure, Component B: curing agent with controlled reactivity) that maintains stability at room temperature while achieving proper curing at reflow temperatures. This parameter optimization prevents pre-curing and viscosity buildup while maintaining mechanical properties.
Solution Approach 2:
The patent creates a composite underfill material system combining epoxy resin, curing agents, and specific additives in controlled ratios. This composite formulation integrates multiple functional components that work together to provide room temperature stability, mechanical strength, and controlled curing behavior during reflow processes.
2Strength
If conventional underfill materials are used, then mechanical support is provided, but processing complexity increases due to separate curing processes and storage requirements below -4°C
Solution Approach 1:
The patent merges the underfill material application with the existing reflow soldering process. The dual-component underfill system is designed to cure simultaneously with the solder joints during the standard reflow process, eliminating the need for separate curing steps and reducing processing complexity while maintaining mechanical support functions.
Solution Approach 2:
The underfill material system is formulated to self-regulate its curing process based on temperature conditions. At room temperature, the material remains stable and non-reactive. During reflow, the heat automatically triggers the curing reaction without requiring external intervention or separate processing steps, making the material self-sufficient.
3Volume of moving object
If conventional underfill materials are used, then gap filling is achieved, but viscosity stability deteriorates due to temperature sensitivity and pre-curing
Solution Approach 1:
The patent optimizes the viscosity parameters of the dual-component underfill system by selecting epoxy resins with specific molecular weights and curing agents with controlled reactivity. The formulation ensures low viscosity at room temperature for easy dispensing and gap filling, while maintaining viscosity stability throughout storage and processing due to the controlled chemical composition and lack of pre-curing reactions.
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 dual-side reinforcement material exhibits stability and mechanical properties similar to traditional underfill materials at room temperature, allowing for standard reflow processes without separate curing, with improved viscosity stability and resistance to thermal cycling and drop shock.
Implementation Method 1
undergoes cross-linking during reflow processes to act as an underfill material
Data Source
AI summary
Dual-side reinforcement (DSR) materials and methods for semiconductor fabrication. The DSR materials exhibit the properties of conventional underfill materials with enhanced stability at room temperature.