Alkoxysilyl Polyamide-Imide Primer for Semiconductor Adhesion
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Solution Overview
Problem
Current primer compositions fail to provide fully satisfactory adhesion, heat resistance, and water resistance for semiconductor encapsulation, leading to potential degradation and reliability issues in semiconductor devices, especially with the adoption of lead-free solders and smaller package sizes.
Innovation Solution
A primer composition comprising an alkoxysilyl-containing polyamide-imide resin, combined with an epoxy resin and an organic solvent, which cures at low temperatures to form a robust, heat-resistant, and water-resistant coating that enhances bonding between the epoxy resin molding compound and semiconductor devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional primer compositions are used to improve adhesion between epoxy resin molding compound and semiconductor devices, then adhesion is enhanced, but heat resistance and water resistance are insufficient
Solution Approach 1:
The patent employs a composite primer composition comprising multiple components: (a) a polyimide resin providing heat resistance, (b) a silane coupling agent enhancing adhesion to substrates, (c) an epoxy resin contributing to bonding strength, and (d) a curing agent. This multi-component composite system synergistically achieves both excellent adhesion and superior heat/water resistance that single-component primers cannot provide.
Solution Approach 2:
The patent modifies the chemical composition parameters of the primer by incorporating specific ratios of polyimide resin, silane coupling agent, epoxy resin, and curing agent. By adjusting these compositional parameters, the primer achieves optimal balance between adhesion properties and thermal/stability resistance, transforming the performance characteristics of the coating.
2Stability of the object's composition
If high temperature curing is used to convert polyamic acid to polyimide, then the resin structure is properly formed, but the process requires high temperature and long time which is disadvantageous for energy saving and process efficiency
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary component that facilitates the curing process. The silane modifies the polyamic acid structure to enable low-temperature conversion to polyimide, acting as a mediator that allows the transformation to occur at reduced temperatures while maintaining proper resin structure formation.
Solution Approach 2:
The patent changes the curing temperature parameter from conventional high temperatures (300°C or higher) to low temperatures (80-150°C) by modifying the chemical composition of the primer system. This parameter change is achieved through the incorporation of specific resins and coupling agents that enable low-temperature imidization, significantly reducing energy consumption and process time.
3Use of energy by stationary object
If insufficient heating is applied during curing, then energy consumption is reduced, but residual polyamic acid remains which causes decline in moisture resistance and corrosion resistance
Solution Approach 1:
The silane coupling agent serves as a mediator that enables complete conversion of polyamic acid to polyimide structure at low temperatures. This intermediary component ensures that even with reduced heating energy input, the chemical transformation is fully completed, eliminating residual polyamic acid that would otherwise compromise moisture and corrosion resistance.
Solution Approach 2:
The patent replaces the conventional thermal energy-based curing mechanism with a chemically-driven low-temperature curing system. By using specially formulated resins and coupling agents, the curing process occurs through chemical reactions at lower temperatures, substituting the need for high thermal energy input while ensuring complete resin structure formation and maintaining reliability.
4Ease of manufacture
If conventional epoxy resin compositions are used for semiconductor encapsulation, then the encapsulation process is simple, but the packages are vulnerable to cracking during solder reflow after moisture absorption
Solution Approach 1:
The patent develops a composite epoxy resin composition containing multiple components: base epoxy resin, reactive diluents, curing agents, and functional additives. This composite formulation provides both processability and enhanced mechanical properties including crack resistance during solder reflow, while maintaining the simplicity of the encapsulation process through a single-step molding operation.
Solution Approach 2:
The patent modifies the chemical composition parameters of the epoxy resin system to achieve optimal balance between processability and reliability. By adjusting the ratios of epoxy resin, diluents, and curing agents, the material exhibits improved flexibility and crack resistance during thermal cycling and solder reflow, while maintaining ease of manufacturing through standard encapsulation processes.
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 primer composition ensures reliable bonding and prevents cracking or delamination during solder reflow, maintaining the integrity and performance of semiconductor devices by providing improved heat and water resistance.
Implementation Method 1
a primer composition comprising an alkoxysilyl-containing polyamide-imide resin, combined with an epoxy resin and an organic solvent, which cures at low temperatures to form a robust, heat-resistant, and water-resistant coating
Implementation Method 2
alkoxysilyl-containing polyamide-imide resin
Implementation Method 3
alkoxysilyl-containing polyamide-imide resin
Data Source
AI summary
A primer composition comprising an alkoxysilyl-containing polyamide-imide resin, an epoxy resin, a curing promoter, and an organic solvent forms a cured coating having heat resistance and water resistance through brief low-temperature heating and helps bonding of epoxy resin molding compound to semiconductor members.