Conjugated Polymers with TID Units for OPV Efficiency
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Solution Overview
Problem
Current organic semiconducting polymers for OPV and OPD devices have limitations such as high bandgap, poor processability, low solubility, and stability, which hinder their efficiency and scalability in mass production.
Innovation Solution
Development of conjugated polymers incorporating [1,2,5]thiadiazolo[3,4-e]isoindole-5,7-dione (TID) repeating units as electron acceptor units, combined with electron donor units in random copolymers, enhancing solubility, processability, and charge carrier mobility, and introducing spacer units to improve structural organization and light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic semiconducting polymers are used, then device manufacturing is possible, but solubility and processability are poor
Solution Approach 1:
The patent modifies the chemical structure of the polymer by incorporating TID units with specific substituents (alkyl, alkoxy, aryl groups) to change the solubility parameters. This structural modification enables the polymer to dissolve in common organic solvents while maintaining its semiconducting properties, directly resolving the contradiction between processability and solubility
Solution Approach 2:
The patent creates a composite polymer structure combining electron donor units with TID electron acceptor units in a random copolymer architecture. This composite approach allows the material to exhibit both good solubility (from the donor units with appropriate substituents) and acceptable charge transport properties (from the conjugated acceptor units), simultaneously improving ease of manufacture and solubility
2Productivity
If polymer bandgap is reduced to improve light harvesting, then OPV efficiency increases, but charge carrier mobility may be affected
Solution Approach 1:
The patent applies local quality by creating distinct functional units within the polymer chain: TID units provide electron acceptance and contribute to light harvesting with reduced bandgap, while donor units with appropriate substituents maintain solubility and structural organization. This local differentiation allows the polymer to achieve both improved OPV efficiency and maintained charge carrier mobility through optimized local structures
Solution Approach 2:
The patent systematically varies the chemical parameters of both donor and acceptor units, including substituent types, chain lengths, and unit ratios, to optimize the balance between bandgap energy (for light harvesting) and charge carrier mobility. By adjusting these parameters, the polymer achieves reduced bandgap for improved OPV efficiency while maintaining adequate charge transport through proper molecular packing
3Ease of manufacture
If solution processing is used for manufacturing, then production cost decreases and scalability increases, but material solubility requirements become more stringent
Solution Approach 1:
The patent modifies the solubility parameters of the polymer by incorporating flexible alkyl chains and alkoxy substituents on the donor units. These structural changes increase the polymer's solubility in common organic solvents, making it compatible with low-cost solution processing techniques while maintaining the material's semiconducting functionality
Solution Approach 2:
The patent enables the use of inexpensive, easily removable solvents in the polymer formulation, allowing for simple solution processing without requiring specialized equipment or expensive processing conditions. This approach reduces manufacturing cost and improves scalability while the polymer's enhanced solubility ensures proper film formation
Data Source
AI summary
The invention relates to novel conjugated polymers containing one or more [1,2,5]Thiadiazolo[3,4-e]isoindole-5,7-dione (TID) repeating units, to methods for their preparation and educts or intermediates used therein, to polymer blends, mixtures and formulations containing them, to the use of the polymers, polymer blends, mixtures and formulations as organic semiconductors in, or for the preparation of, organic electronic (OE) devices, especially organic photovoltaic (OPV) devices and organic photodetectors (OPD), and to OE, OPV and OPD devices comprising, or being prepared from, these polymers, polymer blends, mixtures or formulations.