Fluorinated Silane Gate Insulator for Low-Temperature OTFT Fabrication
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Solution Overview
Problem
Conventional organic thin film transistors (OTFTs) face challenges with low charge carrier mobility and high hysteresis, requiring high-temperature fabrication processes that are not compatible with flexible plastic substrates, and often necessitate complex and costly deposition methods, limiting their application in flexible displays.
Innovation Solution
An organic insulator composition incorporating a fluorinated silane compound is used to form a fluorine-based surface modifier, simplifying the formation of organic insulating films and improving charge carrier mobility and hysteresis in OTFTs, allowing for lower hysteresis and enhanced electrical properties without the need for additional fluorine-based coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inorganic metal oxide or ferroelectric insulator materials are used for gate insulating layers, then the insulating properties are sufficient, but the fabrication process requires high temperature (200-400°C) and complex deposition methods that are not compatible with plastic substrates
Solution Approach 1:
The patent changes the material parameters from inorganic to organic compounds, specifically using silane compounds with low-temperature curing properties. This allows the gate insulating layer to be formed at temperatures below 200°C, making it compatible with plastic substrates while maintaining sufficient insulating properties through the organic compound structure and cross-linking mechanisms.
Solution Approach 2:
The patent employs composite organic materials combining silane compounds with specific functional groups that provide both insulating properties and low-temperature processability. The composite structure includes cross-linkable functional groups that form a network providing insulation while the organic nature allows low-temperature fabrication on flexible substrates.
2Ease of manufacture
If conventional organic insulating film materials (polyimide, benzocyclobutene, photoacryls) are used, then the fabrication can be simplified, but the electrical characteristics are insufficient to replace inorganic insulating films
Solution Approach 1:
The patent creates a composite organic insulating material that combines the fabrication simplicity of organic compounds with the electrical performance of inorganic materials. The silane-based organic compound forms a cross-linked network structure that provides both ease of low-temperature fabrication and sufficient electrical insulation properties to replace conventional inorganic films.
Solution Approach 2:
The patent modifies the chemical structure parameters of organic insulating materials by introducing specific silane compounds with cross-linkable functional groups. This structural modification enhances the electrical characteristics and thermal stability of the organic insulating film while maintaining the advantage of simplified low-temperature fabrication processes.
3Device complexity
If OTFTs are fabricated with conventional gate insulating layers, then the structure is simple, but the charge carrier mobility is low (0.6 cm²/Vs or less) and hysteresis is high
Solution Approach 1:
The patent changes the surface energy parameters of the gate insulating layer by using organic silane compounds with specific surface properties. This modification improves the interface between the gate insulating layer and organic semiconductor layer, resulting in enhanced charge carrier mobility and reduced hysteresis while maintaining structural simplicity.
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 organic insulator composition effectively reduces hysteresis to less than 10 V and maintains charge carrier mobility, facilitating the use of OTFTs in flexible displays and various electronic devices, such as LCDs and OLEDs, through a simplified fabrication process compatible with plastic substrates.
Implementation Method 1
an organic insulator composition including a fluorinated silane compound that may be used to improve the charge carrier mobility and hysteresis of an organic thin film transistor
Data Source
AI summary
Example embodiments of the present invention relate to an organic insulator composition, an organic insulating film having the organic insulator composition, an organic thin film transistor having the organic insulating film, an electronic device having the organic thin film transistor and methods of forming the same. Other example embodiments of the present invention relate to an organic insulator composition including a fluorinated silane compound that may be used to improve the charge carrier mobility and hysteresis of an organic thin film transistor. An organic insulator composition including a fluorinated silane compound and an organic thin film transistor using the same is provided. The hysteresis and physical properties, e.g., threshold voltage and/or charge carrier mobility, of the organic thin film transistor may be improved by the use of the organic insulator composition. The organic thin film transistor may be effectively used in the manufacture of a variety of electronic devices including liquid crystal displays (LCDs) and/or photovoltaic devices.