Organic Semiconductor Compound for Flexible Thin Film Transistors
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Solution Overview
Problem
Conventional amorphous silicon thin film transistors face challenges in high-temperature processing and are difficult to apply to flexible polymer substrates, limiting their use in flexible displays, while organic thin film transistors offer potential but require materials with improved charge mobility and processability.
Innovation Solution
Development of an organic semiconductor compound with a low bandgap and increased charge mobility, capable of being applied via a solution process, using specific chemical structures that enhance intermolecular stacking and solubility, allowing for the formation of a thin film at room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional amorphous silicon thin film transistor is used, then uniformity and electrical characteristics are improved, but high-temperature processing capability deteriorates and application to flexible polymer substrates becomes difficult
Solution Approach 1:
The patent changes the material composition parameter from conventional amorphous silicon to organic semiconductor compounds with specific molecular structures (containing electron-donating groups and electron-withdrawing groups). This parameter change enables the material to maintain good electrical characteristics while being processable at low temperatures, thus resolving the contradiction between electrical performance and temperature processing capability
Solution Approach 2:
The patent uses composite molecular structures combining electron-donating groups (such as triphenylamine, carbazole) and electron-withdrawing groups (such as pyrimidine, pyridine) within the organic semiconductor compound. This composite approach at the molecular level achieves both high charge mobility for good electrical characteristics and appropriate thermal stability for low-temperature processing
2Temperature
If organic thin film transistor is used, then low-temperature processing and flexible substrate compatibility are improved, but charge mobility needs to be increased
Solution Approach 1:
The patent optimizes the molecular structure parameters of organic semiconductor compounds by introducing specific electron-donating and electron-withdrawing groups. This parameter optimization enhances intermolecular interactions and charge transport pathways, achieving high charge mobility while maintaining low-temperature processability
Solution Approach 2:
The patent applies local quality by positioning electron-donating groups and electron-withdrawing groups at specific locations within the molecular structure. This spatial arrangement creates favorable local electronic environments that promote charge carrier generation and transport, improving charge mobility without compromising the overall low-temperature processing capability
3Ease of manufacture
If solution process is used, then manufacturing cost and large-area processing are improved, but material solubility and processability need to be enhanced
Solution Approach 1:
The patent modifies the solubility parameters of organic semiconductor compounds by incorporating specific side chains and functional groups. These structural modifications enhance the compound's solubility in common organic solvents, enabling effective solution processing and large-area fabrication while maintaining manufacturing cost efficiency
Solution Approach 2:
The patent uses organic solvents as intermediaries to dissolve the modified organic semiconductor compounds. The enhanced solubility allows the compounds to be processed in solution form, enabling low-cost large-area fabrication techniques such as spin-coating, inkjet printing, and roll-to-roll processing
Data Source
AI summary
An organic semiconductor compound may be represented by the above Chemical Formula 1 or Chemical Formula 2, and an organic thin film may include the organic semiconductor compound according to Chemical Formula 1 or 2.