Conductive Adhesive Composition for Semiconductor Packaging
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Solution Overview
Problem
Conductive adhesives used in semiconductor packaging face challenges with short pot life and limited functionality due to their reliance on simple heat-based bonding processes, which restricts their application and efficiency in bonding semiconductor chips to substrates.
Innovation Solution
A composition for conductive adhesive is developed, comprising a heterocyclic compound with an epoxy or oxetane group, a reductive curing agent with an amine and carboxyl group, and a photoinitiator, with specific mole ratios, allowing for improved curing characteristics and metal oxide film removal efficiency, initiated by both light and heat, enabling combined heating and light radiation processes for bonding and pattern formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a typical conductive adhesive uses only heat-based bonding process, then the bonding process is simple, but the pot life is short and application functionality is limited
Solution Approach 1:
The patent combines two curing mechanisms (photo-curing and thermal curing) into a single conductive adhesive system. The adhesive contains both a photoinitiator for light-induced polymerization and a thermosetting resin for heat-induced curing, allowing the material to respond to both light and heat stimuli, thereby extending pot life while maintaining bonding simplicity
Solution Approach 2:
The patent changes the curing parameters by introducing dual-curing capability. The adhesive can be cured through photo-polymerization using UV light or through thermal polymerization using heat, or a combination of both. This parameter change allows control over the curing process and extends the working pot life before final curing occurs
2Ease of operation
If a typical conductive adhesive uses only heat-based bonding process, then the process is easy to control, but various functionalities cannot be imparted
Solution Approach 1:
The patent creates a multi-functional conductive adhesive that can perform multiple functions: electrical connection through conductive particles, mechanical bonding through cured resin, surface preparation through metal oxide removal, and pattern formation through photomasking. The dual-curing mechanism enables both simple applications and advanced functionalities within a single system
Solution Approach 2:
The patent incorporates metal oxide removal capability into the adhesive formulation itself, performing surface preparation as a preliminary action before bonding. The adhesive contains reducing agents that remove metal oxide films from substrate surfaces, ensuring good electrical contact and bonding strength before the curing process completes
3Productivity
If a conductive adhesive uses dual curing mechanism (light and heat), then curing efficiency is improved and pot life is extended, but the composition becomes more complex
Solution Approach 1:
The patent uses a composite material system combining thermosetting resin (epoxy, phenolic, or polyester) with photoinitiator compounds and conductive particles. This composite formulation integrates multiple functional components that work together: the resin provides structural bonding, the photoinitiator enables light-curing, and the conductive particles provide electrical connectivity. The composite nature allows dual-curing functionality while maintaining processability
Solution Approach 2:
The patent uses the thermosetting resin as an intermediary that bridges the photo-curing and thermal-curing mechanisms. The resin can undergo both photo-polymerization and thermal polymerization, serving as a common platform that integrates both curing pathways. This intermediary approach allows the system to benefit from both curing mechanisms without requiring separate adhesive formulations
4Adaptability or versatility
If a conductive adhesive uses dual curing mechanism, then diverse bonding processes are enabled, but the manufacturing precision requirements increase
Solution Approach 1:
The patent introduces dynamic control capability to the curing process. The dual-curing system allows the process to adapt to different manufacturing scenarios: photo-curing can be used for rapid initial setting and pattern formation, while thermal curing can be used for complete curing and post-processing. This dynamic approach enables precise control over the bonding process at different stages
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 enhances curing efficiency, extends pot life, and improves metal oxide film removal, enabling diverse bonding processes and surface pattern formation, suitable for various electronic packages.
Implementation Method 1
a photoinitiator, wherein a mixture ratio of the heterocyclic compound and the reductive curing agent satisfies Conditional Expression 1 below
Implementation Method 2
a reductive curing agent including an amine group and a carboxyl group
Implementation Method 3
A composition for conductive adhesive which may be initiated by light and heat
Data Source
AI summary
Provided is a composition for conductive adhesive. The composition for conductive adhesive includes a heterocyclic compound containing oxygen and including at least one of an epoxy group or oxetane group, a reductive curing agent including an amine group and a carboxyl group, and a photoinitiator, wherein a mixture ratio of the heterocyclic compound and the reductive curing agent satisfies Conditional Expression 1 below.0.5≤(b+c)/a≤1.5, a>0, b≥0, c>0 [Conditional Expression 1]where ‘a’ denotes a mole number of a heterocycle in the heterocyclic compound, ‘b’ denotes a mole number of hydrogen bonded to a nitrogen atom of the amine group included in the reductive curing agent, and ‘c’ denotes a mole number of the carboxyl group.