Room-Temperature Photochemical Silver Deposition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for generating electrically-conductive silver in electronic devices are time-consuming, expensive, and incompatible with polymeric substrates, as they require high-temperature sintering and are prone to aggregation, stability issues, and limited compatibility with flexible electronics.
Innovation Solution
A photosensitive composition containing a non-hydroxylic-solvent soluble silver complex, comprising reducible silver ions complexed with an α-oxy carboxylate and a 5- or 6-membered N-heteroaromatic compound, which can be photochemically converted to electrically-conductive silver metal at room temperature using electromagnetic radiation, allowing for rapid and flexible deposition on various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional high-temperature sintering methods are used to generate electrically-conductive silver, then electrical conductivity is achieved, but processing time increases and compatibility with polymeric substrates is lost
Solution Approach 1:
The patent changes the key parameter of processing temperature from high-temperature sintering to room temperature photochemical conversion. By using photosensitive silver complexes that decompose under UV or visible light irradiation, the method achieves electrical conductivity without thermal processing, thereby enabling compatibility with temperature-sensitive polymeric and flexible substrates while maintaining conductive performance
Solution Approach 2:
The patent replaces the thermal-mechanical sintering process with a photochemical conversion process. Instead of using heat and pressure to fuse silver particles into conductive networks, the invention uses light irradiation to trigger the decomposition of silver complexes and formation of conductive silver structures, eliminating the need for high-temperature equipment and enabling substrate compatibility
2Manufacturing precision
If photolithographic and electroless techniques are used for microfabrication of electrically-conductive tracks, then pattern precision is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent incorporates photosensitive silver complexes directly into printable ink formulations before application. The silver complexes are pre-complexed with ligands that provide both solubility in non-aqueous solvents and photosensitivity, allowing the ink to be printed in desired patterns and then converted to conductive structures through light irradiation, eliminating multiple processing steps
Solution Approach 2:
The patent creates a multi-functional ink system where a single printable composition performs multiple functions: it provides silver ion source, solubility in non-aqueous solvents, photosensitivity for pattern formation, and direct conversion to conductive structures. This eliminates the need for separate photolithographic masks, electroless plating baths, and sintering processes
3Ease of manufacture
If silver nanoparticle inks are used for direct printing, then manufacturing simplicity is improved, but aggregation and stability issues worsen
Solution Approach 1:
The patent uses ligands such as carboxylic acids, carboxylates, or polymeric stabilizers as intermediaries between silver ions and the solvent medium. These ligands form stable complexes with silver ions, preventing aggregation while maintaining solubility in non-aqueous solvents. The ligands act as mediators that keep silver ions dispersed and stable in the ink formulation until photochemical conversion
Solution Approach 2:
The patent creates composite ink formulations consisting of silver ions complexed with organic ligands in non-aqueous solvent matrices. The composite structure combines the conductive potential of silver with the stabilizing properties of organic ligands and the solubility characteristics of non-aqueous solvents, achieving both manufacturing simplicity and compositional stability
4Quantity of substance
If aqueous-based silver inks are used, then cost is reduced, but compatibility with polymeric substrates and electronic components worsens
Solution Approach 1:
The patent changes the solvent parameter from aqueous to non-aqueous bases. By using organic solvents such as alcohols, esters, ketones, or their mixtures, the ink becomes compatible with polymeric substrates and electronic components that are sensitive to water. The non-aqueous environment prevents water-related damage while maintaining silver ion solubility and reactivity
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
Enables rapid generation of electrically-conductive silver at room temperature, improving manufacturing efficiency, reducing costs, and enhancing compatibility with diverse substrates, including polymers, while maintaining stability and preventing premature reduction of silver ions.
Implementation Method 1
photochemically converted to electrically-conductive silver metal by irradiation with electromagnetic radiation having a wavelength within the range of at least 150 nm and up to and including 700 nm
Data Source
AI summary
A method for providing electrically-conductive silver-containing metal in a thin film or one or more thin film patterns on a substrate. Electrically-conductive metallic silver is provided from a non-hydroxylic-solvent soluble silver complex represented by the following formula (I):(Ag+)a(L)b(P)c (I)wherein L represents an α-oxy carboxylate; P represents a 5- or 6-membered N-heteroaromatic compound; a is 1 or 2; b is 1 or 2; and c is 1, 2, 3, or 4, provided that when a is 1, b is 1, and when a is 2, b is 2. A photosensitizer can also be present. The reducible silver ions in the photosensitive thin film or photosensitive thin film pattern can be photochemically converted to electrically-conductive metallic silver in the thin films or thin film patterns by irradiation with electromagnetic radiation having a wavelength within the range of at least 150 nm and up to and including 700 nm.