Organic Thin-Film Polymer for Mobility-Solubility Balance
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Solution Overview
Problem
Existing organic thin film transistors face challenges in achieving high charge mobility and solubility, which are crucial for efficient performance in flexible display devices.
Innovation Solution
A polymer incorporating a diketopyrrolopyrrole moiety and a fused polycyclic aromatic moiety is developed, enhancing solubility, charge mobility, and stretchability through specific structural units and linking groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic semiconductors are used in thin film transistors, then device fabrication is simplified, but charge mobility remains insufficient for high-performance applications
Solution Approach 1:
The patent modifies the chemical structure of organic semiconductors by incorporating fused polycyclic aromatic moieties and optimizing side chain configurations to achieve high charge mobility (μ ≥ 10^-5 cm²/Vs) while maintaining solution processability. This structural parameter change enables both high performance and ease of manufacture through solution-based fabrication methods
Solution Approach 2:
The invention develops composite organic semiconductor materials combining fused polycyclic aromatic cores with tailored side chains (e.g., triphenylamine, carbazole groups). These composite structures achieve synergistic effects where the core provides high mobility and the side chains ensure solubility and processability, resolving the contradiction between performance and manufacturability
2Reliability
If organic semiconductors are designed for high charge mobility, then device performance improves, but solubility and processability deteriorate
Solution Approach 1:
The patent applies local quality by differentiating functional regions within the organic semiconductor molecule: the fused polycyclic aromatic core provides high charge mobility, while peripheral side chains (e.g., alkyl groups, triphenylamine moieties) provide solubility. This spatial separation of functions resolves the contradiction between mobility and solubility
Solution Approach 2:
The invention segments the organic semiconductor into distinct functional modules: a rigid fused aromatic core for charge transport and flexible solubilizing side chains for processability. This modular segmentation allows independent optimization of mobility and solubility characteristics
3Adaptability or versatility
If flexible display devices are implemented with organic thin film transistors, then device flexibility and stretchability are achieved, but maintaining high charge mobility becomes more difficult
Solution Approach 1:
The patent employs solution-processable organic semiconductor materials that can be deposited as thin films on flexible substrates. These materials maintain high charge mobility despite the flexible form factor, enabling disposable or replaceable flexible display devices with performance comparable to rigid counterparts
Solution Approach 2:
The invention uses thin film structures of organic semiconductors with engineered molecular flexibility. The fused polycyclic aromatic cores provide charge transport pathways that remain intact even when the thin film is bent or stretched, maintaining mobility while enabling flexible device configurations
Data Source
Figure 1A~1C
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AI summary
Disclosed are a polymer including at least one structural unit with a moiety represented by Chemical Formula 1, an organic thin film including the polymer, a thin film transistor, and an electronic device. In Chemical Formula 1, Ar1 to Ar3, L1, L2, and R1 to R6 are the same as described in the detailed description.