Photosensitive Silver Ion Composition for Room-Temperature Conductive Films
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Solution Overview
Problem
Current methods for fabricating electrically-conductive silver patterns and films are time-consuming and expensive, particularly when using photolithographic and electroless techniques, and they are not compatible with polymeric substrates, requiring high temperatures and sintering processes that can damage temperature-sensitive materials.
Innovation Solution
A photosensitive reducible silver ion-containing composition comprising a non-hydroxylic-solvent soluble silver complex with a reducible silver ion complexed with an α-oxy carboxylate and a 5- or 6-membered N-heteroaromatic compound, which can generate electrically-conductive silver metal at room temperature upon exposure to actinic radiation, allowing for rapid and flexible deposition on various substrates without the need for high-temperature sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photolithographic and electroless techniques are used to fabricate silver patterns, then electrical conductivity is achieved, but the process becomes time-consuming and expensive
Solution Approach 1:
The patent replaces complex mechanical and chemical processes (photolithography, electroless plating) with a direct photochemical reduction process. Silver ions in the composition are reduced to metallic silver through exposure to actinic radiation, eliminating the need for multiple processing steps including development, rinsing, and sintering, thereby significantly reducing fabrication time and cost while maintaining electrical conductivity
Solution Approach 2:
The patent changes the chemical parameters of the silver-containing composition by using a specific complex of silver ion with carboxylate and N-heteroaromatic compound that is reducible by light. This parameter change enables direct photoreduction at room temperature, transforming the fabrication process from high-temperature, multi-step procedures to a simple, fast, room-temperature photochemical process
2Reliability
If high-temperature sintering processes are used to create conductive silver films, then electrical conductivity is improved, but compatibility with polymeric substrates is lost
Solution Approach 1:
The patent changes the temperature parameter of the processing condition from high-temperature sintering to room temperature photochemical reduction. The silver complex is designed to be reducible by actinic radiation at room temperature, producing conductive silver metal without thermal damage to temperature-sensitive polymeric substrates, thereby achieving both electrical conductivity and substrate compatibility
Solution Approach 2:
The patent replaces thermal energy input (sintering) with optical energy input (actinic radiation) to achieve silver metal formation. This substitution eliminates the need for high-temperature processing, enabling the use of polymeric and other temperature-sensitive substrates while still producing electrically conductive silver patterns
3Productivity
If rapid silver metal generation is achieved through photochemical reduction, then productivity is improved, but stability of the silver complex may be compromised
Solution Approach 1:
The patent applies local quality by designing the silver complex with specific functional groups (carboxylate and N-heteroaromatic compound) that provide different properties: the carboxylate group provides stability through coordination bonding, while the N-heteroaromatic compound enables photochemical reduction. This localized functional design allows the complex to simultaneously achieve stability during storage and rapid reduction upon light exposure
Solution Approach 2:
The patent introduces dynamic behavior to the silver complex by making it photo-responsive. The complex remains stable in the dark but undergoes rapid reduction to metallic silver upon exposure to actinic radiation. This dynamic property allows the composition to maintain stability during handling and storage while enabling rapid silver metal generation during the fabrication 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 rapid and cost-effective generation of electrically-conductive silver metal at room temperature, compatible with a wide range of substrates including plastics and metals, with improved stability and controllable chemical activity, facilitating high-speed manufacturing processes like roll-to-roll operations and various printing techniques.
Implementation Method 1
a photosensitizer that can reduce the reducible silver ion or oxidize the α-oxy carboxylate
Implementation Method 2
generate electrically-conductive silver metal at room temperature upon exposure to actinic radiation
Data Source
AI summary
A photosensitive reducible silver ion-containing composition can be used to provide electrically-conductive silver metal in thin films or patterns. This composition comprises: a) 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; b) optionally, a photosensitizer that can either reduce the reducible silver ion or oxidize the α-oxy carboxylate; and c) a solvent medium comprising at least one non-hydroxylic solvent. Electrically-conductive silver can be provided by photochemical conversion of the reducible silver ions in the complex.