Organic Semiconductor Compounds for Flexible Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional amorphous silicon thin film transistors require high-temperature deposition processes, making it difficult to apply them to low-temperature substrates such as polymer substrates for flexible displays, and existing organic thin film transistors face challenges in achieving high charge mobility and large-area processing.
Innovation Solution
Development of organic semiconductor compounds with specific structural units, such as those represented by Chemical Formulas 1 and 2, which can be fabricated using a solution process, enabling the creation of transistors and electronic devices with improved charge mobility and suitability for low-temperature substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amorphous silicon thin film transistor is used, then good uniformity and high electrical properties are achieved, but high-temperature deposition process is required which is incompatible with low-temperature substrates
Solution Approach 1:
The patent changes the material parameter from amorphous silicon to organic semiconductor compounds with specific chemical structures (containing electron-donating and electron-withdrawing units). This material substitution allows the transistor to operate at low temperatures while maintaining good electrical properties, resolving the contradiction between electrical performance and temperature compatibility.
2Ease of manufacture
If organic semiconductor polymer material is used, then large-area processing with low cost is achieved, but charge mobility is limited compared to low molecular or oligomer materials
Solution Approach 1:
The patent employs composite material design by combining electron-donating units (such as thiophene derivatives) and electron-withdrawing units (such as pyridine, pyrimidine, or triazine rings) within the same polymer structure. This composite approach at the molecular level enables the material to simultaneously achieve good charge mobility and solution processability, resolving the contradiction between manufacturing ease and electrical performance.
Solution Approach 2:
The patent applies local quality by introducing specific functional units (electron-donating and electron-withdrawing groups) at specific positions within the polymer chain. The electron-donating units provide charge transport pathways while the electron-withdrawing units enhance molecular planarity and intermolecular interactions, locally optimizing both charge mobility and processability without compromising the overall polymer structure.
3Reliability
If low molecular or oligomer organic semiconductor material is used, then high charge mobility is achieved, but vacuum deposition process is required which increases manufacturing complexity
Solution Approach 1:
The patent changes the processing parameter from vacuum deposition to solution-based processing by designing organic semiconductor compounds with appropriate solubility characteristics. The specific molecular structures (with electron-donating and electron-withdrawing units) enable the materials to be dissolved in common solvents, allowing simple solution processing techniques to be used while maintaining high charge mobility, thus resolving the contradiction between electrical performance and process complexity.
Data Source
AI summary
An organic semiconductor compound including a structural unit represented by Chemical Formula 1.