Organic Semiconductor Electrode Material Surface Tension Control
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Solution Overview
Problem
Existing electrode materials for organic semiconductor devices face challenges in forming excellent electrode patterns, particularly when using water as a solvent, leading to issues with surface tension and wettability.
Innovation Solution
An electrode material comprising inorganic nanoparticles, an organic π-conjugated ligand with hydrophilic substituents, a fluorine-based surfactant, and a surface tension adjuster with a dielectric constant of 20 to 30, which helps in forming a favorable electrode pattern by adjusting the surface tension and suppressing volatilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water is used as a solvent in electrode material, then cost and environmental friendliness are improved, but surface tension control and wettability become difficult
Solution Approach 1:
The patent introduces a surface tension adjuster as an intermediary substance between water and the electrode material components. This mediator modifies the surface tension properties of the aqueous dispersion medium, enabling proper wettability and pattern formation without replacing water with organic solvents. The surface tension adjuster bridges the incompatibility between water-based solvent and electrode material deposition requirements.
Solution Approach 2:
The patent changes the surface tension parameter of the dispersion medium by adding specific surfactants or surface tension modifiers. This parameter adjustment allows the aqueous-based electrode material to achieve appropriate wetting characteristics and pattern quality, transforming the physical properties of the solvent system to meet deposition requirements while maintaining water as the primary solvent.
2Manufacturing precision
If fluorine-based surfactant is added to electrode material, then surface tension and wettability are improved, but material complexity increases
Solution Approach 1:
The fluorine-based surfactant performs multiple functions simultaneously: it adjusts surface tension, improves wettability, and enhances dispersion stability of the electrode material. By using a single additive that accomplishes multiple objectives, the patent reduces the need for separate components or processing steps, thereby limiting the increase in overall system complexity despite the addition of sophisticated chemistry.
3Manufacturing precision
If surface tension adjuster with specific dielectric constant is used, then electrode pattern formation is improved, but formulation complexity increases
Solution Approach 1:
The patent specifies a particular dielectric constant range (20-30) for the surface tension adjuster to optimize electrode pattern formation. This parameter specification allows formulators to select from multiple commercial products that meet the criterion, maintaining flexibility while achieving consistent results. The dielectric constant parameter serves as a selection guideline rather than a unique material requirement, balancing precision with practical formulation ease.
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 proposed electrode material enables the formation of high-quality electrode patterns and enhances the performance of organic thin-film transistors by maintaining optimal surface tension and wettability, resulting in improved electrode performance.
Implementation Method 1
an electrode material for an organic semiconductor device into which a predetermined amount of a fluorine-based surfactant is blended and which includes a specific surface tension adjuster is used, an excellent electrode pattern can be formed
Implementation Method 2
the organic π-conjugated ligand is a ligand having at least one hydrophilic substituent
Implementation Method 3
a surface tension adjuster of which a dielectric constant is 20 to 30
Data Source
AI summary
An object of the present invention is to provide an electrode material for an organic semiconductor device with which an excellent electrode pattern can be formed, a method for forming an electrode pattern, and an organic thin-film transistor.An electrode material for an organic semiconductor device of the present invention includes inorganic nanoparticles, an organic π-conjugated ligand, water, 0.0005% to 15% by mass of a fluorine-based surfactant, and a surface tension adjuster of which a dielectric constant is 20 to 30, in which the organic π-conjugated ligand is a ligand having at least one hydrophilic substituent.