Solvent Composition for High-Crystallinity Organic Transistors
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Solution Overview
Problem
Current organic transistor production methods face challenges with the low solubility of unsubstituted acene-type organic semiconductor materials, leading to poor crystallinity and performance, and existing solvents like aryl halides require high temperatures for dissolution, posing ecological and safety concerns.
Innovation Solution
A solvent composition comprising specific alkyl-containing compounds such as 1,1,3,3-tetramethylurea, 1,3-dimethyl-2-imidazolidinone, and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone enhances the solubility of organic semiconductor materials at lower temperatures, allowing for self-organization and high-crystallinity transistor formation on plastic substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an unsubstituted acene type compound is used as organic semiconductor material, then high semiconductor device performance is achieved, but solubility in solvent is poor due to strong intermolecular interaction
Solution Approach 1:
The patent introduces a specific solvent (1,3-dimethyl-2-imidazolidinone) as an intermediary substance that mediates between the organic semiconductor material and the dissolution process. This solvent specifically addresses the solubility problem of unsubstituted acene compounds by providing appropriate solvation, enabling high-concentration solutions without requiring structural modification of the semiconductor material itself.
Solution Approach 2:
The patent changes the parameter of solvent type from conventional solvents to 1,3-dimethyl-2-imidazolidinone, which has specific chemical properties that enhance solubility of acene compounds. This parameter change in the solvent system allows achieving high solubility while maintaining the original high-performance semiconductor material structure.
2Quantity of substance
If aryl halide solvent is used for dissolution with heating, then solubility of organic semiconductor material is improved, but ecological toxicity concerns and work safety issues arise
Solution Approach 1:
The patent replaces hazardous aryl halide solvents with 1,3-dimethyl-2-imidazolidinone, which is environmentally friendly and safe for work. This substitution eliminates the harmful factors associated with aryl halides while maintaining or improving the dissolution capability, prioritizing ecological and safety considerations without sacrificing performance.
Solution Approach 2:
The patent converts the previously harmful aryl halide solvent system into a beneficial alternative by using 1,3-dimethyl-2-imidazolidinone. This new solvent not only eliminates toxicity and safety issues but also provides enhanced solubility for organic semiconductor materials, turning a harmful approach into a beneficial one.
3Manufacturing precision
If high concentration composition is prepared, then organic semiconductor film quality is improved, but solubility limitations prevent achieving high concentration with unsubstituted acene compounds
Solution Approach 1:
The patent uses 1,3-dimethyl-2-imidazolidinone as an intermediary solvent that enables the preparation of high-concentration compositions. This solvent specifically addresses the solubility barrier, allowing unsubstituted acene compounds to be dissolved at high concentrations, which in turn enables the formation of high-quality organic semiconductor films with appropriate crystal grain size.
4Weight of moving object
If plastic substrate is used instead of glass substrate, then weight reduction and flexibility are achieved, but heat resistance is insufficient for high-temperature processing
Solution Approach 1:
The patent changes the processing temperature parameter from high-temperature (required for glass substrates and conventional solvents) to low-temperature processing enabled by 1,3-dimethyl-2-imidazolidinone. This parameter change in dissolution temperature makes plastic substrates viable, as the low processing temperature is compatible with the low heat resistance of plastic materials.
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 solvent composition enables the formation of high-crystallinity organic transistors on flexible, lightweight plastic substrates at lower temperatures, reducing production costs and improving impact resistance, while maintaining safety and ecological compatibility.
Implementation Method 1
a solvent or solvent composition for organic semiconductor material dissolution, including a solvent A represented by the following formula (A)
Implementation Method 2
when a substrate is coated with a composition for organic transistor production containing the solvent, an organic semiconductor material is crystallized by self-organizing action
Data Source
AI summary
Solvent or solvent composition for organic transistor production, which is excellent in solubility of an organic semiconductor material, and which can form an organic transistor high in crystallinity. The solvent or solvent composition for organic transistor is a solvent or solvent composition for organic semiconductor material dissolution, and includes a solvent ‘A’ represented by the formula (R1)N(R2)—C(═O)—(R3)N(R4) wherein R1 to R4 are the same or different, and each represents a C1-2 alkyl group, or R1 and R4 may be bound to one another to form a ring together with the —N(R2)—C(═O)—N(R3)— moiety as well as an organic semiconductor material.