Perfluoropolyether Copolymer Banks for Organic Thin Film Transistors
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Solution Overview
Problem
Existing methods for forming banks in organic electronic devices using organic solvents lead to degradation of insulating films and reduced ink material definition, causing performance deterioration in organic thin film transistors.
Innovation Solution
A copolymer of a photosensitive polymer and a perfluoropolyether derivative is used to form banks, which increases the contact angle and reduces surface energy, preventing ink material overflow and degradation, and is processed using photolithography to ensure precise patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If organic solvent-based photoresist is used to form banks, then banks can be formed to divide pixel regions, but the organic solvent degrades the organic insulating film and deteriorates device performance
Solution Approach 1:
The patent changes the fundamental parameter of the bank material from organic solvent-based to water-based. This parameter change eliminates the harmful degradation effect on organic insulating films while maintaining the ability to form precise banks through photolithography processing
Solution Approach 2:
The patent uses a composite material system consisting of water-soluble polymer, perfluoropolyether derivative, and photosensitive compound. This composite provides both the water-based solvent system that prevents degradation and the photosensitive properties needed for precise bank formation
2Manufacturing precision
If conventional bank materials are used, then banks can be formed, but the surface contact angle decreases causing ink material overflow and reduced definition
Solution Approach 1:
The patent introduces perfluoropolyether derivative into the bank material composition, which fundamentally changes the surface energy parameters. This results in increased surface contact angle and reduced surface energy, preventing ink material overflow while maintaining sharp definition
Solution Approach 2:
The patent applies perfluoropolyether derivative specifically to the bank material surface to create local quality differentiation. The banks have high surface contact angle properties to repel ink, while the rest of the device structure maintains its original properties
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 copolymer composition effectively prevents degradation of organic films and enhances ink material definition between banks, maintaining the performance of organic thin film transistors and adjacent devices.
Implementation Method 1
A copolymer of a photosensitive polymer and a perfluoropolyether derivative is used to form banks, which increases the contact angle and reduces surface energy
Implementation Method 2
processed using photolithography to ensure precise patterning
Data Source
AI summary
Disclosed are a copolymer of a perfluoropolyether derivative and a photosensitive polymer, a composition for forming banks comprising the copolymer, and a method for forming banks using the composition. Also disclosed is an organic thin film transistor including the composition and an electronic device including the organic thin film transistor. The use of the copolymer may enable the formation of banks by a solution coating process. Because an organic thin film transistor including banks formed by the method may be fabricated without any degradation in the characteristics of the organic thin film transistor, improved electronic properties may be exhibited.