Stretchable Polymer for Organic Semiconductor Thin Films
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Solution Overview
Problem
Current materials for stretchable display devices and bio-attachable devices lack both stretchability and maintenance of electrical performance after deformation, necessitating a new polymer with excellent electrical properties and flexibility.
Innovation Solution
A polymer with structural units represented by Chemical Formulas 1 to 3, including electron accepting and donating moieties, is developed, offering high charge mobility and solubility, enabling the formation of stretchable thin films suitable for electronic devices through a solution process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used for stretchable devices, then the device structure is simple, but the material lacks both stretchability and maintenance of electrical performance after deformation
Solution Approach 1:
The patent employs composite materials by combining electron accepting moieties (Formulas 1-3) with electron donating moieties in a single polymer chain. This composite molecular structure enables simultaneous achievement of stretchability and electrical performance maintenance, as the complementary functional groups work together to maintain charge transport pathways during deformation while providing mechanical flexibility.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying the chemical structures of the moieties (changing R groups, L groups, and their connections) to optimize both mechanical and electrical properties. By adjusting the chemical parameters of the polymer building blocks, the material achieves appropriate balance between stretchability and electrical conductivity without requiring complex device structures.
2Reliability
If a polymer with high charge mobility is developed, then electrical performance is improved, but the complexity of material synthesis increases
Solution Approach 1:
The patent applies segmentation by dividing the polymer into distinct functional segments: electron accepting moieties (Formulas 1-3) and electron donating moieties. This segmentation allows independent optimization of each component's properties while maintaining overall polymer processability. The segmented structure enables high charge mobility through efficient charge transport pathways while keeping synthesis manageable through modular assembly of standardized building blocks.
3Adaptability or versatility
If the polymer is designed for stretchability, then mechanical flexibility is improved, but electrical conductivity may deteriorate during deformation
Solution Approach 1:
The patent introduces intermediary structures through the linking groups (L1-L6) and substituent groups (R1-R6) that act as mediators between the electron accepting and donating moieties. These intermediary elements maintain stable connections during deformation, ensuring that charge transport pathways remain intact while allowing mechanical stretching. The intermediary groups facilitate both stretchability and conductivity by preserving molecular order during mechanical stress.
Data Source
AI summary
Disclosed are a polymer including a structural unit represented by Chemical Formula 1, a structural unit represented by Chemical Formula 2, and a structural unit represented by Chemical Formula 3, an organic semiconductor material and a thin film including the polymer, and an electronic device including the thin film:In Chemical Formulas 1 to 3,the definitions of R1 to R6, L1 to L6, and * are as described in the specification.