Photosensitive Silver Complex for Room-Temperature Conductive Patterns
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Solution Overview
Problem
Current methods for producing electrically-conductive silver patterns are time-consuming and expensive, particularly when using silver nanoparticle-based inks, which require high temperatures incompatible with polymer substrates and involve sintering processes that are not suitable for all materials, and existing chemical ink formulations have stability and compatibility issues with polymeric substrates.
Innovation Solution
A photosensitive composition containing a non-hydroxylic-solvent soluble silver complex, comprising a reducible silver ion complexed with an α-oxy carboxylate and an oxime compound, that can be photochemically converted to electrically-conductive silver metal at room temperature using actinic radiation, allowing for rapid generation of metallic silver on a variety of substrates including polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver nanoparticle-based inks are used to produce electrically-conductive silver patterns, then electrical conductivity is improved, but manufacturing cost increases and process time extends due to required sintering processes
Solution Approach 1:
The patent changes the chemical parameters of the silver precursor formulation by using specific silver salts (silver acetate, silver formate, or silver propionate) combined with chelating agents (acetylacetone, acetoacetate, or propylacetoacetate). This chemical parameter change enables direct decomposition to metallic silver without requiring thermal sintering, thus improving productivity while maintaining electrical conductivity.
Solution Approach 2:
The patent replaces the thermal-mechanical sintering process with a photochemical decomposition process. By using photoactive silver precursor formulations that decompose under UV or visible light irradiation, the mechanical/thermal sintering step is eliminated, reducing both process time and manufacturing cost while achieving the same electrical conductivity result.
2Reliability
If high temperature sintering processes are used to create electrically-conductive silver patterns, then electrical conductivity is improved, but compatibility with polymer substrates deteriorates due to temperature sensitivity
Solution Approach 1:
The patent changes the processing temperature parameter from high temperature (sintering) to room temperature or low temperature by using photoactive silver precursor formulations. The silver salts combined with chelating agents decompose under light irradiation at ambient conditions, producing metallic silver directly without requiring high-temperature treatment, thus maintaining compatibility with temperature-sensitive polymer substrates.
Solution Approach 2:
The patent substitutes the thermal sintering mechanism with a photochemical decomposition mechanism. The photoactive formulation containing silver salts and chelating agents undergoes light-induced decomposition to form conductive silver patterns, replacing the high-temperature thermal process with a low-temperature photochemical process that preserves substrate integrity.
3Ease of manufacture
If conventional chemical ink formulations are used for silver pattern fabrication, then manufacturing cost is reduced, but stability and compatibility with polymeric substrates deteriorate
Solution Approach 1:
The patent creates a composite ink formulation by combining silver salts (silver acetate, silver formate, or silver propionate) with specific chelating agents (acetylacetone, acetoacetate, or propylacetoacetate). This composite formulation provides both cost-effectiveness and enhanced stability, as the chelating agents form stable complexes with silver ions that prevent premature reduction while remaining compatible with polymeric substrates.
Solution Approach 2:
The patent optimizes the chemical composition parameters of the ink formulation by selecting specific silver salts with appropriate solubility and reactivity characteristics. The use of acetate, formate, or propionate salts combined with β-diketone chelating agents creates a balanced formulation that achieves both stability during storage and controlled decomposition upon light exposure, while maintaining substrate compatibility.
4Manufacturing precision
If photolithographic and electroless techniques are used for silver pattern fabrication, then manufacturing precision is improved, but process time and complexity increase
Solution Approach 1:
The patent merges the patterning function and the metal deposition function into a single photoactive ink formulation. The ink contains silver salts and chelating agents that decompose under light irradiation to form conductive silver patterns directly, combining what were previously separate photolithography and electroless plating steps into one integrated process, thus reducing complexity while maintaining precision.
Solution Approach 2:
The patent replaces the multi-step photolithographic and electroless plating process with a direct photochemical decomposition process. The photoactive ink formulation decomposes under UV or visible light to deposit metallic silver patterns in a single step, eliminating the need for separate development, etching, and plating operations, thereby simplifying the overall manufacturing process.
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 the rapid and flexible generation of electrically-conductive silver patterns at room temperature, compatible with a wide range of substrates, reducing manufacturing costs and simplifying the process, while maintaining stability and controllable chemical activity.
Implementation Method 1
photochemically converting reducible silver ions in the photosensitive thin film or photosensitive thin film pattern to electrically-conductive silver metal by irradiation of the photosensitive thin film or photosensitive thin film pattern with electromagnetic radiation
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 an oxime 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.