Organic Semiconductor Plasticizer Composite for Flexible Transistors
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Solution Overview
Problem
Pure organic semiconducting materials with high charge carrier mobility are brittle, limiting the flexibility of electronic devices, while materials with desirable mechanical properties often have low charge carrier mobility, making it challenging to achieve both flexibility and effective conduction in organic field-effect transistors.
Innovation Solution
Combining organic semiconductor molecules with plasticizer molecules to form a solid channel, where the plasticizer molecules comprise at least 50% by weight, promoting interdiffusion and forming an interphase region that enhances charge carrier mobility and electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pure organic semiconducting materials with high charge carrier mobility are used, then charge carrier mobility is improved, but mechanical flexibility deteriorates due to brittleness
Solution Approach 1:
The patent creates a composite material system consisting of organic semiconductor molecules dispersed in a plasticizer matrix. This composite approach allows the material to inherit high charge carrier mobility from the semiconductor components while gaining mechanical flexibility from the plasticizer, thereby resolving the contradiction between electrical performance and mechanical properties
Solution Approach 2:
The patent changes the physical state and composition parameters of the organic semiconductor system by incorporating plasticizers at specific weight ratios (at least 50% by weight). This parameter change transforms the material from a brittle solid to a flexible solid solution, maintaining electrical functionality while improving mechanical flexibility
2Strength
If materials with desirable mechanical properties are used, then mechanical flexibility is improved, but charge carrier mobility deteriorates
Solution Approach 1:
The patent uses plasticizer molecules as an intermediary medium to disperse and support organic semiconductor molecules. The plasticizer acts as a matrix that provides mechanical flexibility while allowing semiconductor molecules to maintain their charge transport pathways, thus enabling both mechanical flexibility and adequate charge carrier mobility
3Strength
If plasticizer molecules comprising at least 50% by weight are used, then mechanical flexibility is improved, but the complexity of forming stable solid phase increases
Solution Approach 1:
The patent utilizes phase transition principles by forming a stable solid solution phase of organic semiconductor molecules in the plasticizer matrix. By controlling the plasticizer content (at least 50% by weight) and processing conditions, the system transitions from a liquid or amorphous state to a stable solid phase that maintains both flexibility and electrical functionality, simplifying the overall device fabrication process
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 approach results in a significant increase in charge carrier mobility, improving the electrical performance of organic field-effect transistors while maintaining mechanical stability, with measured mobilities being about a factor of 10 greater than control devices using intrinsic organic semiconducting polymers.
Implementation Method 1
promoting interdiffusion and forming an interphase region that enhances charge carrier mobility and electrical properties
Data Source
AI summary
A method includes combining organic semiconductor molecules and plasticizer molecules to form over a substrate a solid organic semiconductor channel. The channel may comprise at least about 50% by weight of the plasticizer molecules.