Metal Precursor Ink Formulation for Low-Temperature Copper Printing
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Solution Overview
Problem
Copper nanoparticle-based inks for printing conductive patterns face challenges due to poor resistance to oxidation and high sintering temperatures, limiting their use on low-cost, temperature-sensitive substrates.
Innovation Solution
A novel ink formulation comprising metal precursors in the form of metal salt nanoparticles or complexes, dispersed or dissolved in a medium, which are stable and can decompose at lower temperatures to form conductive patterns on various substrates, including heat-sensitive ones, without requiring reducing atmospheres.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper nanoparticle-based inks are used for printing conductive patterns, then conductivity is achieved, but sintering temperature increases above 150°C and oxidation resistance deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the ink formulation by incorporating specific complexing agents that form stable copper complexes. These complexes modify the decomposition behavior of copper precursors, enabling sintering at lower temperatures (below 150°C) while simultaneously improving oxidation resistance through the protective effect of the complexing agents during the sintering process.
Solution Approach 2:
The invention creates a composite system by combining copper precursors with organic complexing agents (such as carboxylic acids, amines, or their salts) to form copper complexes. This composite approach allows the organic components to provide oxidation protection while the copper precursor delivers conductivity, resolving the contradiction between oxidation resistance and sintering temperature requirements.
2Reliability
If high sintering temperatures are used to form copper patterns, then conductivity is improved, but substrate compatibility deteriorates for heat-sensitive substrates
Solution Approach 1:
The patent modifies the thermal decomposition parameters of the copper precursor by using complexing agents that enable controlled decomposition at lower temperatures. This parameter change allows the formation of stable conductive patterns at temperatures suitable for heat-sensitive substrates such as plastics, expanding substrate compatibility while maintaining pattern stability.
3Reliability
If conventional copper nanoparticle inks are formulated, then conductivity is achieved, but process complexity increases due to special atmosphere requirements
Solution Approach 1:
The invention enables the copper complex ink to self-protect against oxidation during sintering through the inherent stability of the copper complex formulation. The complexing agents remain coordinated to copper during decomposition, providing intrinsic protection that eliminates the need for external reducing atmospheres or special process equipment, thereby simplifying the sintering process while maintaining pattern quality.
4Ease of operation
If metal complexes with high organic content are used, then solubility and printability are improved, but energy consumption increases during sintering
Solution Approach 1:
The patent optimizes the organic-to-metal ratio and selects complexing agents with appropriate molecular weights and decomposition temperatures. This parameter optimization ensures sufficient solubility for good printability while the complexes decompose at lower temperatures, reducing the energy required for sintering compared to conventional high-organic-content formulations.
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 formulation enables the production of stable, oxidation-resistant conductive patterns on heat-sensitive substrates at lower temperatures, reducing the need for high organic content and energy, and preventing print-head clogging, while achieving higher conductivities and compatibility with ink-jet printing technologies.
Implementation Method 1
metal precursors in the form of metal salt nanoparticles or complexes, dispersed or dissolved in a medium, which are stable and can decompose at lower temperatures to form conductive patterns
Implementation Method 2
The conversion from the salt or complex form to the metallic form may be carried out by heating
Data Source
AI summary
Provided herein are novel ink formulations based on metal salts and metal complexes.