Heat Bonding Sheet with Component Migration Prevention Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional die bond sheets with low carbon content exhibit low workability and adhesion issues during the bonding process, leading to component migration when laminated with other sheets, which compromises their heat bonding performance.
Innovation Solution
A sheet for heat bonding comprising a pre-sintering layer with metal fine particles and an organic binder, combined with a component migration prevention layer containing an organic binder, is used to suppress component migration when laminated with other sheets, enhancing adhesion and heat bonding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the carbon content in the die bond sheet is reduced to 1.5% by mass or less, then the heat dissipation properties and electric resistivity are improved, but the workability during sheet preparation deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by limiting carbon content to 1.5% by mass or less while controlling metal component content (silver 70-90 wt%, copper 5-30 wt%). This parameter optimization resolves the contradiction by achieving both improved heat dissipation properties through low carbon content and acceptable workability through controlled metal component ratios.
2Reliability
If the carbon content in the die bond sheet is reduced to 1.5% by mass or less, then the electric resistivity is improved, but the adhesion at the stage before sintering deteriorates
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: carbon content ≤1.5% by mass, metal component content 85-95 wt%, and specific metal ratios (silver 70-90 wt%, copper 5-30 wt%). This multi-parameter optimization achieves both low electric resistivity and sufficient adhesion before sintering.
Solution Approach 2:
The die bond sheet uses a composite material system combining metal components (silver, copper) with controlled carbon content. This composite structure allows the material to achieve both low electric resistivity through metal content and adequate adhesion through the optimized composite composition.
3Ease of operation
If the sheet for heat bonding is laminated with another sheet (e.g., dicing tape), then the handling and processing are improved, but component migration occurs between sheets
Solution Approach 1:
The patent applies preliminary anti-action by pre-treating the sheet surface or incorporating anti-migration agents in the composition before lamination. The controlled low carbon content (≤1.5% by mass) and specific metal component ratios create a composition that resists component migration when laminated with other sheets, while still allowing proper handling and processing.
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 solution effectively prevents component migration and improves adhesion before sintering, ensuring the sheet's original heat bonding performance is maintained, even when used with dicing tape, by controlling the composition and structure of the pre-sintering and component migration prevention layers.
Implementation Method 1
a pre-sintering layer serving as a sintered layer after being heated
Implementation Method 2
an organic binder contained in the pre-sintering layer
Implementation Method 3
a component migration prevention layer contained in the sheet for heat bonding
Data Source
AI summary
A sheet for heat bonding, having a pre-sintering layer that becomes a sintered layer by being heated, and a component migration prevention layer.