Fused Polycyclic Heteroaromatic Compound for High Mobility Solution Processing
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Solution Overview
Problem
Current organic semiconductor materials for thin film transistors have either low charge mobility or require expensive vacuum deposition equipment, making them unsuitable for large-area device fabrication and processibility.
Innovation Solution
A low-molecular-weight fused polycyclic heteroaromatic compound with a compact planar structure is developed, enabling high charge mobility and deposition via a room-temperature solution process, improving processibility and forming a uniform thin film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer organic material is used as organic semiconductor material, then processibility is improved, but charge mobility is reduced and blocking leakage current increases
Solution Approach 1:
The invention changes the molecular weight parameter from high (polymer) to low (low-molecular-weight compound) while maintaining solution processibility. This parameter change enables the material to form highly ordered crystalline structures that provide high charge mobility (μ ≥ 0.1 cm²/Vs) while retaining the ease of manufacture associated with solution processing.
Solution Approach 2:
The invention creates a composite structure at the molecular level by combining the solubility characteristics of polymers with the high charge mobility of low-molecular-weight compounds. The resulting low-molecular-weight fused polycyclic heteroaromatic compound exhibits properties of both material classes: solution processibility like polymers and high charge mobility like small molecules.
2Reliability
If low molecular organic material is used as organic semiconductor material, then charge mobility is improved, but expensive vacuum deposition equipment is required and large-area fabrication becomes difficult
Solution Approach 1:
The invention changes the deposition method parameter from vacuum deposition to solution processing. By designing low-molecular-weight compounds with appropriate solubility characteristics, the material can be processed using solution methods at room temperature, eliminating the need for expensive vacuum deposition equipment while maintaining high charge mobility.
Solution Approach 2:
The invention replaces the mechanical vacuum deposition system with a chemical solution processing system. Instead of using vacuum equipment to deposit material, the compound is dissolved in solvent and applied to the substrate, then dried to form the active layer. This substitution enables large-area fabrication and simplifies the manufacturing process.
3Reliability
If conventional organic semiconductor materials are used, then device fabrication is limited, but new materials with improved electrical characteristics and processibility are required
Solution Approach 1:
The invention segments the material into low-molecular-weight discrete molecules rather than using long-chain polymers or complex structures. This segmentation into small, well-defined molecular units with specific fused polycyclic heteroaromatic structures enables both high charge mobility and solution processibility, simplifying the overall device fabrication process.
Data Source
AI summary
A low-molecular-weight fused polycyclic heteroaromatic compound includes a compound represented by Chemical Formula 1A, a compound represented by Chemical Formula 1B, or a combination thereof. The fused polycyclic heteroaromatic compound has a compact planar structure in which five or more aromatic rings are fused together, and thereby exhibit higher charge mobility, and furthermore, enables the use of a deposition process or a room-temperature (about 20 to about 25° C.) solution process when applied to devices, therefore realizing improved processibility.