Photosensitive Silver Complex for Room-Temperature Conductive Patterns
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Solution Overview
Problem
Current methods for fabricating electrically-conductive silver patterns and grids in electronic devices are time-consuming and expensive, particularly when using photolithographic and electroless techniques, and are not compatible with polymeric substrates, as they require high temperatures and involve sintering processes that can damage temperature-sensitive materials.
Innovation Solution
A photosensitive composition containing a non-hydroxylic-solvent soluble silver complex, comprising reducible silver ions complexed with an α-oxy carboxylate and an oxime compound, which can be rapidly converted to electrically-conductive silver metal at room temperature upon exposure to actinic radiation, allowing for direct digital printing and use on a variety of substrates including plastics and metals.
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 manufacturing time and cost increase significantly
Solution Approach 1:
The patent changes the chemical parameters of the silver complex formulation to enable direct photoreduction. By using a non-hydroxylic solvent system with specific silver complexing agents, the invention achieves rapid silver metal formation upon light exposure, eliminating the need for time-consuming electroless plating and sintering processes while maintaining electrical conductivity
Solution Approach 2:
The invention extracts and eliminates the problematic sintering step from the conventional photolithographic process. By formulating a silver complex that reduces directly to conductive silver metal upon light exposure, the patent removes the need for high-temperature sintering, thereby reducing manufacturing time and enabling direct digital printing applications
2Reliability
If high temperature sintering processes are used to create conductive silver patterns, then electrical conductivity is improved, but compatibility with polymeric substrates is lost
Solution Approach 1:
The patent changes the temperature parameter of the silver reduction process by using a photochemically active complex formulation. The silver complex is designed to reduce at room temperature upon light exposure, eliminating the need for high-temperature sintering and thereby enabling compatibility with temperature-sensitive polymeric substrates while maintaining electrical conductivity
Solution Approach 2:
The invention introduces a photosensitive silver complex as an intermediary substance that mediates between the light source and the substrate. This complex absorbs light energy and converts it to chemical energy for silver metal formation, enabling low-temperature processing that protects polymeric substrates from thermal damage while still achieving conductive patterns
3Productivity
If direct digital printing is used to simplify manufacturing, then productivity increases, but manufacturing precision and pattern quality may deteriorate
Solution Approach 1:
The patent optimizes the photoreduction kinetics by adjusting the chemical parameters of the silver complex formulation. By controlling the rate and completeness of silver metal formation through light exposure, the invention enables direct digital printing to achieve both high productivity and manufacturing precision, with complete pattern development and sharp edges
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 approach enables high-speed, cost-effective generation of electrically-conductive silver patterns and grids at room temperature, compatible with a wide range of substrates, and provides greater flexibility in manufacturing processes such as roll-to-roll operations, while maintaining stability and controllable chemical activity.
Implementation Method 1
a photosensitizer that can either reduce the reducible silver ion or oxidize the α-oxy carboxylate
Data Source
AI summary
A product article is prepared from a precursor article that has a substrate and a photosensitive thin film or a photosensitive thin film pattern on a supporting side. The product article have an electrically-conductive silver metal-containing film or thin film patterns, each of which contains electrically-conductive metallicsilver obtained by reduction of silver ions in the precursor article, an α-oxy carboxylate, an oxime compound, and a photosensitizer that can either reduce reducible silver ions or oxidize the α-oxy carboxylate.