Fused Polycyclic Heteroaromatic Compound for High Mobility Solution Processing
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Solution Overview
Problem
Current organic semiconductor materials for thin film transistors, such as pentacene and polythiophene, have limitations including low charge mobility, high off-state leakage current, and require expensive vacuum deposition processes, making them unsuitable for large-area applications.
Innovation Solution
A fused polycyclic heteroaromatic compound with a compact planar structure, represented by Chemical Formulae 1A and 1B, is developed, which exhibits high charge mobility and can be deposited using a room-temperature solution process, improving processability and solubility, and is used in an organic thin film as a carrier transport layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If low-molecular-weight organic materials like pentacene are used to achieve high charge mobility, then charge mobility is improved (about 3.2 to 5.0 cm2/Vs or more), but expensive vacuum deposition apparatus is required and processibility is undesirable
Solution Approach 1:
The patent modifies the molecular structure parameters of organic semiconductor materials by introducing fused polycyclic heteroaromatic compounds with specific ring structures (8 or more aromatic rings) and substituent groups. This structural parameter change enables the material to achieve high charge mobility through improved molecular packing while simultaneously gaining solubility in common organic solvents, eliminating the need for vacuum deposition apparatus.
2Ease of manufacture
If polymer organic materials like polythiophene are used to improve processibility, then ease of manufacture is improved, but charge mobility is low and off-state leakage current is high
Solution Approach 1:
The patent creates composite molecular structures combining the advantages of both low-molecular-weight and polymer materials. The fused polycyclic heteroaromatic compounds possess rigid planar cores that enable high charge mobility similar to low-molecular-weight materials, while the solubilizing substituent groups (alkyl chains, alkoxy groups, etc.) provide solution processibility similar to polymer materials, achieving a synergistic effect.
3Speed
If materials requiring vacuum deposition are used to achieve high charge mobility, then charge mobility is improved, but device complexity and manufacturing cost increase for large-area applications
Solution Approach 1:
The patent replaces the mechanical vacuum deposition system with a chemical solution-based deposition method. The fused polycyclic heteroaromatic compounds can be dissolved in common organic solvents and deposited using simple solution processing techniques such as spin coating, dip coating, or inkjet printing, substituting complex vacuum apparatus with straightforward chemical deposition processes suitable for large-area manufacturing.
Data Source
AI summary
A fused polycyclic heteroaromatic compound represented by Chemical Formula 1A or 1B that has a compact planar structure in which eight or more rings are fused together.