Conductive Polymer Compositions Using Fluorinated Acid Polymers
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Solution Overview
Problem
Existing electrically conductive polymer compositions used in organic electronic devices, such as OLEDs, suffer from low pH levels due to water-soluble polymeric sulfonic acids, leading to decreased stress life and corrosion, and have conductivities too low for effective use as electrodes in thin film field effect transistors.
Innovation Solution
A conductive polymer composition comprising an electrically conductive copolymer and a fluorinated acid polymer, where the fluorinated acid polymer is present during the formation of the conductive copolymer, enhancing conductivity and stability, and allowing for improved compatibility with semiconducting polymers and solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water-soluble polymeric sulfonic acids are used to prepare conducting polymers, then the polymers can be synthesized in aqueous solution, but the resulting compositions have undesirably low pH levels leading to decreased stress life and corrosion
Solution Approach 1:
The patent changes the chemical parameter of the polymeric acid from conventional sulfonic acids to fluorinated sulfonic acids. This parameter change maintains the ability to synthesize conducting polymers in aqueous solution while fundamentally altering the pH characteristics and chemical stability, thereby resolving the contradiction between ease of manufacture and device reliability
Solution Approach 2:
The patent creates a composite system comprising the conducting polymer (polyaniline or polythiophene) combined with fluorinated polymeric sulfonic acid. This composite material integrates the electrical conductivity of the conducting polymer with the chemical stability and high pH buffer capacity of fluorinated polymeric sulfonic acids, simultaneously achieving ease of aqueous synthesis and improved device reliability
2Ease of operation
If conventional conducting polymers are used for electrode applications, then they can facilitate charge carrier transport, but their conductivities are too low for effective use as electrodes in thin film field effect transistors
Solution Approach 1:
The patent changes the chemical composition parameter by introducing fluorinated groups into the polymeric sulfonic acid structure. This parameter modification enhances the electrical conductivity of the composite material while maintaining charge carrier transport capabilities, thereby resolving the contradiction between ease of operation and electrical conductivity for electrode applications
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 new composition achieves a conductivity of at least 10−7 S/cm, improving the chemical, physical, and electrical properties of the polymer, thereby extending the life of organic electronic devices and enhancing their performance as electrodes.
Implementation Method 1
a fluorinated acid polymer, where the fluorinated acid polymer is present during the formation of the conductive copolymer, enhancing conductivity
Implementation Method 2
forming a combination of water, at least two precursor monomers, at least one fluorinated acid polymer, and an oxidizing agent
Data Source
AI summary
The present disclosure relates to electrically conductive polymer compositions, comprising at least one electrically conductive copolymer; and at least one fluorinated acid polymer, their use in organic electronic devices, and methods for preparation.