Liquid Epoxy Resin Composition for Semiconductor Encapsulation
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Solution Overview
Problem
Existing liquid epoxy resin compositions for semiconductor encapsulation face challenges with slow curing times, adhesion issues to silicon chips and nitride films, and vulnerability to high reflow temperatures and humid conditions, leading to cracking and peeling problems.
Innovation Solution
A liquid epoxy resin composition comprising a liquid epoxy resin, an aromatic amine curing agent with a specific formula, microcapsules containing a phenolic hydroxy-bearing benzoic acid derivative, and optionally an inorganic filler, which reduces curing time, enhances adhesion, and improves thermal shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid epoxy resin compositions are used for semiconductor encapsulation, then adhesion to substrates and reflow resistance are improved, but curing time becomes excessively long (3 hours at 150°C)
Solution Approach 1:
The patent changes the chemical parameters of the curing system by introducing a novel curing agent with specific molecular structure (formula 1) and controlling the equivalent ratio between epoxy resin and curing agent within 0.95-1.05. This parameter optimization enables significantly reduced curing time while maintaining strong adhesion to substrates and resistance to reflow temperatures.
Solution Approach 2:
The invention creates a composite curing system combining the novel aromatic amine curing agent (formula 1) with the liquid epoxy resin, forming a composite material system that achieves both fast curing and high reliability. The specific composition ratio and molecular structure create synergistic effects that resolve the contradiction between speed and strength.
2Productivity
If reflow temperature is increased to 260-270°C for lead-substitute solders, then soldering capability is improved, but encapsulant adhesion deteriorates causing peeling at interfaces
Solution Approach 1:
The patent modifies the chemical composition parameters by introducing a curing agent with specific structural features (formula 1 containing R1-R3 groups) that creates enhanced crosslinking density and thermal stability. The equivalent ratio control (0.95-1.05) ensures complete reaction and optimal network structure, enabling the encapsulant to withstand 260-270°C reflow temperatures without adhesion loss.
Solution Approach 2:
The invention prepares the encapsulant material in advance with optimized curing characteristics that prevent adhesion failure before it occurs. The specific curing agent formulation and ratio control create a pre-conditioned material that is inherently resistant to thermal stress and interface peeling during high-temperature soldering processes.
3Productivity
If curing time is reduced using phenolic accelerators, then productivity is improved, but pot life becomes short and working efficiency decreases
Solution Approach 1:
The patent changes the fundamental parameter of the curing mechanism by using a novel aromatic amine curing agent (formula 1) instead of conventional phenolic accelerators. This structural parameter change enables fast curing through optimized chemical reactivity while maintaining stable pot life, resolving the trade-off between curing speed and working time.
Solution Approach 2:
The invention replaces conventional curing systems with a specially designed curing agent that achieves rapid curing without the harmful side effects of short pot life. The novel formulation acts as a self-regulating system that provides both speed and stability, eliminating the need to compromise between these conflicting requirements.
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 composition cures quickly, maintains adhesion to silicon chips and nitride films, withstands high reflow temperatures, and remains stable under hot humid conditions, preventing cracking and peeling, even after multiple thermal cycling cycles.
Implementation Method 1
microcapsules containing a phenolic hydroxy-bearing benzoic acid derivative
Implementation Method 2
an aromatic amine curing agent, especially an aromatic amine curing agent containing at least 5% by weight of an aromatic amine compound having the general formula (1)
Data Source
AI summary
Better semiconductor encapsulation is achieved with a liquid epoxy resin composition comprising (A) a liquid epoxy resin, (B) a curing agent containing at least 5 wt % of an aromatic amine compound, (C) a microencapsulated catalyst containing a phenolic hydroxy-bearing benzoic acid derivative, and optionally, (D) an inorganic filler.