Fused Polycyclic Heteroaromatic Compound for High Mobility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic semiconductor materials for thin film transistors face challenges with low charge mobility and high off-state leakage currents, and require complex and expensive synthesis processes, making them unsuitable for large-area film formation.
Innovation Solution
A fused polycyclic heteroaromatic compound with a compact planar structure is developed, which enhances charge mobility and molecular packing without the need for complex synthesis, using a core moiety and substituent moieties with specific heterocyclic groups to suppress bond rotation and improve planarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer or oligomer organic materials are used for thin film transistor channels, then solution processing may be applied, but charge mobility decreases and off-state leakage current increases
Solution Approach 1:
The patent changes the molecular weight parameter from high (polymers/oligomers) to low (small molecules), and changes the molecular structure parameter to planar fused polycyclic heteroaromatic structures. This allows the material to maintain solution processability while achieving high charge mobility through improved molecular packing and reduced leakage current
Solution Approach 2:
The patent creates a composite molecular structure combining planar fused polycyclic heteroaromatic core units with specific heterocyclic groups (containing N, S, Se, or Te atoms). This composite structure achieves both solution processability and high charge mobility by combining the benefits of planar geometry for packing with heteroatoms for electronic properties
2Reliability
If low-molecular-weight organic materials like pentacene are used, then charge mobility increases, but expensive vacuum deposition apparatus is required and processibility is undesirable
Solution Approach 1:
The patent changes the processing method parameter from vacuum deposition to solution processing by incorporating appropriate substituents (Ra groups) that enhance solubility. This allows low-molecular-weight planar fused polycyclic heteroaromatic materials to be processed using simple solution methods while maintaining high charge mobility
Solution Approach 2:
The patent replaces expensive vacuum deposition processes with cheap solution processing methods. The materials can be processed using simple spin coating or dip coating techniques with common organic solvents, eliminating the need for expensive vacuum deposition apparatus while achieving comparable or superior device performance
3Manufacturing precision
If complex synthesis processes are used for organic semiconductor materials, then molecular structure precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent segments the molecular structure into a planar fused polycyclic heteroaromatic core unit and separate substituent groups (Ra). This segmentation allows the core structure to be synthesized with high precision while substituents can be easily modified to tune properties like solubility, simplifying the overall synthesis process
Solution Approach 2:
The patent applies local quality by placing specific heterocyclic groups (with N, S, Se, or Te atoms) at specific positions around the planar core structure. This localized placement of functional groups achieves precise molecular structure control while maintaining relatively simple synthesis pathways
Data Source
AI summary
A fused polycyclic heteroaromatic compound represented by Chemical Formula 1, and an organic thin film, an organic thin film transistor, and an electronic device including the fused polycyclic heteroaromatic compound are provided. The fused polycyclic heteroaromatic compound may have a conjugation structure but reinforce planarity among adjacent rings and have further dense packing and thus much increase charge mobility.