Nanoparticle Sintered Interconnects for Low-Temperature Electronics Joining
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Solution Overview
Problem
Current sintering methods for interconnecting electronic components are inadequate, particularly for components sensitive to temperature and pressure, as they require high temperatures and can damage sensitive materials, and are not well-suited for polymer substrates or components with high thermal inertia.
Innovation Solution
A method involving a sintering solution with polyhedral metal nanoparticles (primarily silver, gold, or copper) and a stabilizing agent, where the solvent is partially eliminated and a destabilizing agent is used to facilitate sintering at temperatures below 200°C without applying pressure, allowing for the formation of a strong and conductive interconnection layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional sintering methods are used to interconnect electronic components, then strong and conductive interconnection layers are achieved, but high temperatures (200-300°C) damage temperature-sensitive components such as polymer substrates and doped semiconductor materials
Solution Approach 1:
The invention changes the sintering temperature parameter from traditional 200-300°C to below 100°C by using organic solvents that evaporate at low temperatures, leaving behind metal nanoparticle aggregates that sinter into conductive interconnection layers. This parameter change enables interconnection of temperature-sensitive components without thermal damage
Solution Approach 2:
The invention utilizes the phase transition of organic solvents from liquid to vapor at low temperatures. The solvent evaporates completely during the interconnection process, removing the need for high-temperature sintering while still forming strong metal nanoparticle aggregates that provide electrical and thermal conductivity
2Temperature
If pressure is applied to reduce sintering temperature, then lower sintering temperatures are achieved, but components may be damaged by the applied pressure
Solution Approach 1:
The invention extracts the pressure requirement from the sintering process by using organic solvents with specific evaporation characteristics. The solvent removal and metal nanoparticle aggregation occur without applied pressure, eliminating pressure-induced component damage while achieving low-temperature interconnection
Solution Approach 2:
The invention changes multiple parameters simultaneously: temperature is reduced below 100°C, pressure is eliminated (ambient pressure only), and organic solvents are used instead of water. This combination of parameter changes enables pressureless, low-temperature sintering that protects sensitive components
3Temperature
If sintering paste with micrometric and nanometric particles is used, then sintering temperature is reduced, but the process remains incompatible with polymer substrates and high thermal inertia components
Solution Approach 1:
The invention uses exclusively nanometric metal particles (1-100 nm) dispersed in organic solvents, with sintering performed below 100°C. This parameter combination provides sufficient reactivity for low-temperature sintering while the low processing temperature ensures compatibility with polymer substrates, doped semiconductor materials, and other temperature-sensitive components
Solution Approach 2:
The invention uses organic solvents that create a protective environment during evaporation, preventing oxidation of metal nanoparticles at low temperatures. This inert-like environment enables complete solvent removal and proper nanoparticle aggregation without requiring high temperatures that would damage sensitive components
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
This method enables efficient interconnection of sensitive electronic components at lower temperatures, preserving their integrity and achieving high electrical and thermal conductivity without the need for pressure, making it suitable for components that would be damaged by traditional sintering processes.
Implementation Method 1
sintering the interconnection layer by bringing the agglomerate into contact with at least one destabilizing agent configured to desorb the stabilizing agent from the metal nanoparticles in order to aggregate and coalesce said metal nanoparticles between themselves
Implementation Method 2
a stabilizing agent adsorbed onto the metal nanoparticles
Implementation Method 3
a destabilizing agent configured to desorb the stabilizing agent from the metal nanoparticles
Implementation Method 4
eliminating, at least partially, the solvent from the interconnection layer such as to form at least one agglomerate
Data Source
AI summary
A method for interconnecting components of an electronic system includes depositing a sintering solution onto a first component to form an interconnection layer, the sintering solution having metal nanoparticles dispersed in a solvent, and a stabilizing agent adsorbed onto the nanoparticles. The nanoparticles have for more than 95.0% of their mass a metal selected from silver, gold, copper and alloys thereof and have a polyhedral shape with an aspect ratio of more than 0.8. The method also includes eliminating, at least partially, solvent from the layer to form an agglomerate in which the stabilizing agent binds nanoparticles together and maintains at least a portion of the nanoparticles at a distance from each other; debinding and sintering the layer by bringing the agglomerate into contact with a destabilizing agent to aggregate and coalesce the nanoparticles and depositing a second component in contact with the layer before or during debinding or sintering.