Extended Isoindigo Polymers for Solution-Processed OTFTs
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Solution Overview
Problem
Existing organic or polymeric semiconductor compositions for OTFTs face limitations in solubility, air sensitivity, and low field-effect mobility, making them less suitable for liquid deposition and patterning processes.
Innovation Solution
The development of extended isoindigo polymers with specific structural features, such as long branched alkyl side chains and extended π-conjugation, which enhance solubility, air stability, and field-effect mobility, and can be incorporated into film-forming semiconductor compositions for use in OTFTs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solution-based deposition techniques are used to fabricate OTFTs, then manufacturing cost is reduced and device geometry variability is increased, but the semiconductor compositions suffer from limited solubility, air sensitivity, and low field-effect mobility
Solution Approach 1:
The patent modifies the chemical structure of isoindigo polymers by introducing specific side chain configurations and conjugation extensions, changing the material parameters to achieve both solution processability and high field-effect mobility. The structural modifications enable the polymer to maintain performance while being compatible with low-cost solution-based fabrication methods
Solution Approach 2:
The patent creates composite semiconductor materials by combining isoindigo polymer units with specific side chain structures and conjugation systems. This composite approach allows the material to exhibit both good solubility for solution processing and high charge carrier mobility for device performance
2Ease of manufacture
If solution-based deposition techniques are used to fabricate OTFTs, then manufacturing cost is reduced, but the semiconductor compositions exhibit limited solubility and air sensitivity
Solution Approach 1:
The patent changes the chemical parameters of the isoindigo polymer by introducing air-stable side chain structures and conjugation systems that resist oxidation and degradation. This allows the material to maintain stability in ambient conditions while remaining soluble enough for solution-based processing
Solution Approach 2:
The patent develops polymers that can be processed using inexpensive solution-based methods rather than requiring expensive vacuum deposition equipment. The materials are designed to be stable enough for practical use despite being processed through simple, low-cost solution techniques
3Stability of the object's composition
If extended isoindigo polymers with long branched alkyl side chains are synthesized, then solubility is improved, but molecular weight and polymer chain complexity increase
Solution Approach 1:
The patent divides the polymer structure into distinct segments: a rigid isoindigo core unit and flexible side chain units. This segmentation allows the core to provide structural integrity and charge transport pathways while the side chains provide solubility, effectively separating the conflicting requirements of structural simplicity and solubility enhancement
Data Source
AI summary
An extended isoindigo polymer of Formula (I), below, is provided.