Solution-Processable N-Type Ladder Copolymer for Thin-Film Transistors
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Solution Overview
Problem
Aromatic heterocyclic ladder polymers with limited solubility pose challenges in fabrication due to their corrosive acidic solvents, making them difficult to process into films suitable for electronic and photonic devices like photovoltaic cells, as they are corrosive and difficult to handle.
Innovation Solution
Development of a soluble n-type ladder copolymer with tetracarbonyl perylene and tetraamino pyridine units, functionalized with solubilizing groups, allowing for solubility in common organic solvents and forming flat, stable films with reduced surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aromatic heterocyclic ladder polymers are used as semiconductor materials, then high electron mobility and stability are achieved, but solubility is limited and corrosive acidic solvents are required
Solution Approach 1:
The patent modifies the chemical structure of ladder polymers by introducing solubilizing groups (such as alkyl chains, alkoxy groups, or bulky aromatic substituents) at specific positions on the polymer backbone. This structural parameter change enables the polymers to dissolve in non-corrosive solvents while preserving the core heterocyclic aromatic structure that provides high electron mobility and stability.
Solution Approach 2:
The patent creates composite semiconductor materials by combining the rigid heterocyclic aromatic core (providing stability and electron mobility) with flexible solubilizing side chains or attached groups. This composite approach allows the material to exhibit both the desired electrical properties and improved processability in safe solvents.
2Reliability
If aromatic heterocyclic ladder polymers are used as semiconductor materials, then high electron mobility is achieved, but handling difficulty increases due to corrosive solvents
Solution Approach 1:
The patent changes the solvent system from corrosive acidic solvents to safe, non-corrosive organic solvents by modifying the polymer structure. This allows the material to be handled, processed, and deposited using standard laboratory and industrial techniques without requiring specialized corrosion-resistant equipment or safety protocols.
Solution Approach 2:
The patent converts the inherent rigidity and stability of the ladder polymer structure, which originally caused poor solubility, into a benefit by adding solubilizing groups that enable processing while maintaining the structural integrity and electron mobility properties that define high-performance semiconductor materials.
3Stability of the object's composition
If traditional ladder polymers are used, then structural stability is maintained, but film quality deteriorates due to surface roughness
Solution Approach 1:
The patent introduces solubilizing groups and modifies molecular weight parameters to enable the formation of smooth, flat films during solution processing. These structural modifications allow the polymer to self-assemble into uniform films with reduced surface roughness while preserving the core structural stability of the heterocyclic aromatic backbone.
Data Source
AI summary
A thin film transistor having a solution-processed n-type copolymer semiconductor material. A thin-film transistor (TFT) device including, an organic TFT device having at least one substrate, at least one gate electrode, at least one electrically-insulating dielectric material, at least one drain electrode, at least one source electrode, and at least one n-type solution-processable semiconductor material.