Ethynylene Heteroacene Polymers for Flexible Thin Film Transistors
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Solution Overview
Problem
Conventional semiconductor materials for thin film transistors are prone to oxidative doping when exposed to air, leading to low current on/off ratios and high production costs due to the need for rigorous oxygen exclusion during processing, limiting their use in flexible and large-area electronic devices.
Innovation Solution
Ethynylene heteroacene polymers are developed, which are solution-processable, stable, and exhibit high solubility, allowing for the fabrication of thin film transistors with enhanced mechanical durability and structural flexibility, enabling their use on plastic substrates and reducing the need for expensive vacuum deposition methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor materials are used in thin film transistors, then device functionality is achieved, but the materials are prone to oxidative doping when exposed to air, resulting in low current on/off ratios and high production costs due to rigorous oxygen exclusion requirements
Solution Approach 1:
The patent develops heteroacene polymers with inherent resistance to oxidative doping, allowing devices to operate in ambient air without requiring inert atmosphere processing. The polymer structure is designed to prevent oxidation, eliminating the need for costly vacuum deposition and inert environment manufacturing while maintaining high current on/off ratios
Solution Approach 2:
The invention modifies the chemical structure of semiconductor materials by developing heteroacene polymers with specific molecular configurations that inherently resist oxidation. This parameter change in material composition enables stable device operation in air, eliminating the need for rigorous oxygen exclusion during processing
2Stability of the object's composition
If conventional rigid substrates and materials are used, then device stability is achieved, but structural flexibility and mechanical durability are limited, preventing use on plastic substrates and in flexible electronic devices
Solution Approach 1:
The patent employs heteroacene polymers that combine the stability of conventional semiconductors with the flexibility needed for plastic substrates. These polymer materials create a composite system that maintains device stability while enabling structural flexibility and mechanical durability for flexible electronic devices
Solution Approach 2:
The invention changes the physical state and mechanical properties of semiconductor materials by using solution-processable polymers instead of rigid small molecules. This parameter change enables the materials to be deposited on flexible plastic substrates while maintaining sufficient device stability and performance
3Manufacturing precision
If vacuum deposition methods are used for fabrication, then film quality is achieved, but manufacturing costs increase and large-scale production becomes difficult
Solution Approach 1:
The patent replaces vacuum deposition methods with solution processing techniques. The heteroacene polymers can be dissolved in solvents and deposited using simple coating methods, eliminating the need for expensive vacuum equipment while maintaining film quality and enabling large-scale, cost-effective production
Solution Approach 2:
The invention uses solution processing with inexpensive solvents and simple deposition techniques instead of costly vacuum systems. This approach sacrifices the ultra-high precision of vacuum deposition but achieves sufficient film quality for practical applications while dramatically reducing manufacturing costs and enabling scalable production
Data Source
AI summary
An electronic device comprising a semiconductive material of Formula or structure (I)wherein each R1, R2, R3 and R4 are independently hydrogen (H), a heteroatom containing group, a suitable hydrocarbon, or a halogen; Ar and Ar′ each independently represents an aromatic moiety; x, y, a, b, c, d, e, f and g represent the number of groups or rings, respectively; Z represents sulfur, oxygen, selenium, or NR′″ wherein R′″ is hydrogen, alkyl, or aryl; and n represents the number of repeating units.