Fused Polycyclic Heteroaromatic Compound for High Mobility Solution Processing
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Solution Overview
Problem
Existing organic semiconductor materials for thin film transistors face challenges with low charge mobility and high off-state leakage currents, and require expensive vacuum deposition processes, making them unsuitable for large-area applications.
Innovation Solution
A low-molecular-weight fused polycyclic heteroaromatic compound with a compact planar structure is developed, enabling high charge mobility and improved processibility through room-temperature solution processing, suitable for use in electronic devices as a carrier transport layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer or oligomer organic materials are used for TFT channel, then solution process may be applied, but charge mobility decreases and off-state leakage current increases
Solution Approach 1:
The patent changes the molecular structure parameters by designing a specific fused polycyclic heteroaromatic compound with seven or more fused rings containing nitrogen, sulfur, or oxygen atoms. This structural parameter change enables the material to achieve high charge mobility (3.2-5.0 cm²/Vs or more) while maintaining solution processability, resolving the contradiction between ease of manufacture and reliability
Solution Approach 2:
The patent creates a composite molecular structure by fusing multiple heteroaromatic rings together to form a compact planar structure. This composite approach combines the benefits of high charge mobility typically found in low-molecular-weight materials with the solution processability of polymers, achieving both high reliability and ease of manufacture
2Reliability
If low-molecular-weight organic materials are used for TFT channel, then charge mobility increases, but expensive vacuum deposition apparatus is required
Solution Approach 1:
The patent modifies the molecular weight parameter by designing a low-molecular-weight compound (seven or more fused rings) that maintains high charge mobility while being processable by solution methods. This parameter change eliminates the need for expensive vacuum deposition apparatus, resolving the contradiction between reliability and ease of manufacture
Solution Approach 2:
The patent replaces expensive vacuum deposition processes with cheaper solution processing methods. By designing the compound to be soluble in common solvents, the invention enables the use of simple, low-cost manufacturing processes while maintaining high charge mobility, effectively substituting expensive equipment with affordable alternatives
3Reliability
If dimeric bisbenzodithiophene with fused rings is used, then charge mobility increases, but processibility remains insufficient
Solution Approach 1:
The patent extends the fused ring structure from dimeric bisbenzodithiophene to a more complex composite of seven or more fused heteroaromatic rings. This composite structure enhances charge mobility while the specific arrangement of heteroatoms (N, S, O) improves solubility and processibility, resolving the contradiction between reliability and ease of manufacture
Data Source
AI summary
A low-molecular-weight fused polycyclic heteroaromatic compound may have a compact planar structure in which seven or more rings are fused together. The compound may exhibit a relatively high charge mobility and enable the use of a deposition process or a room-temperature solution process when applied to devices, therefore realizing improved processibility. An organic thin film and electronic device may include the fused polycyclic heteroaromatic compound.