Vinyl Ether Polymer Dielectrics for Low-Voltage OFET Operation
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Solution Overview
Problem
Conventional organic field-effect transistors using polystyrene as dielectric material do not achieve high drain currents at low gate-source voltage due to the low dielectric constant of polystyrene, limiting their operation at low gate-source voltage.
Innovation Solution
Development of polymers comprising specific units that enhance the dielectric constant, allowing for high drain currents at low gate-source voltage, compatible with liquid processing techniques for flexible and lightweight electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polystyrene is used as dielectric material, then the device is compatible with liquid processing techniques, but the dielectric constant is low resulting in low drain current at low gate-source voltage
Solution Approach 1:
The patent employs composite dielectric materials consisting of polymer matrices (such as polycarbonate, polyethylene terephthalate, or cyclic carbonate polymers) combined with high dielectric constant inorganic particles (such as barium titanate, lead zirconate titanate, or strontium titanate). This composite structure enables the dielectric layer to maintain compatibility with liquid processing techniques while achieving high dielectric constants (greater than 3.5, preferably greater than 4.0), thereby enabling high drain currents at low gate-source voltages in flexible electronic devices.
2Reliability
If a dielectric layer with large capacitance is used to achieve high drain current at low gate-source voltage, then the transistor can operate at low voltage, but the device complexity increases
Solution Approach 1:
The patent achieves high capacitance in the dielectric layer by modifying the dielectric constant parameter of the material itself rather than increasing layer thickness or complexity. By selecting polymer matrices with specific properties and combining them with high dielectric constant inorganic particles, the dielectric constant is increased to greater than 3.5 (preferably greater than 4.0), which directly increases capacitance and enables low-voltage operation without complicating the device structure.
3Use of energy by moving object
If the dielectric constant is increased to enable low gate-source voltage operation, then energy consumption is reduced, but the manufacturing process becomes more difficult
Solution Approach 1:
The patent applies local quality by incorporating high dielectric constant inorganic particles specifically within the dielectric layer where they are most needed for capacitance enhancement, while maintaining the overall polymer matrix structure that remains compatible with liquid processing techniques. This localized addition of functional particles achieves high dielectric constants (greater than 3.5, preferably greater than 4.0) without requiring fundamental changes to the manufacturing process, allowing low-voltage operation to be achieved while maintaining ease of manufacture.
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 polymers enable field-effect transistors to operate efficiently at low gate-source voltage with high charge carrier mobility, suitable for portable devices and compatible with liquid processing techniques.
Implementation Method 1
the polymer comprises at least 50 mol% units of formula (1) and (2)... wherein the ether oxygen atom in the unit of formula (2) has a lone pair of electrons oriented perpendicular to the plane defined by the oxygen atom and the two carbon atoms to which the oxygen atom is bonded
Data Source
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AI summary
The present invention provides polymers comprising units of formula (1) as well as compositions comprising the polymers, processes for the preparation of the polymers, electronic devices comprising the polymers, and processes for the preparation of the electronic devices, and the use of the polymers as dielectric materials.