BBT Conjugated Polymers for OPV Charge Transport
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Solution Overview
Problem
Current organic semiconducting polymers for organic electronic devices lack ease of synthesis, high charge carrier mobility, stability, and low bandgap properties necessary for efficient organic photovoltaic cells and other applications.
Innovation Solution
Development of compounds containing divalent benzo[1,2-d;4,5-d']bisthiazole-4,8-diyl units, which are used to create conjugated polymers with electron acceptor or donor properties, suitable for use in organic electronic devices such as photovoltaic cells and photodetectors, offering improved solubility, processability, and charge transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic semiconducting polymers are used, then device manufacturing is possible, but charge carrier mobility is insufficient and synthesis complexity increases
Solution Approach 1:
The patent modifies the chemical structure of conventional polymers by incorporating BBT units with specific substituents (R1-R8 groups) to optimize charge carrier mobility while maintaining manageable synthesis complexity through systematic structural variations
Solution Approach 2:
The invention creates composite polymer structures combining electron-rich donor units with electron-deficient BBT acceptor units in alternating copolymers, achieving high charge carrier mobility through the synergistic interaction of complementary electronic properties
2Reliability
If polymers with high charge carrier mobility are developed, then OPV efficiency improves, but bandgap remains too high for maximum solar spectrum absorption
Solution Approach 1:
The patent systematically adjusts the bandgap parameter by selecting different BBT substituents (R1-R8) and donor units to achieve optimal balance between charge carrier mobility and bandgap energy for maximum solar spectrum utilization
Solution Approach 2:
The invention employs alternating copolymer structures that replicate successful donor-acceptor patterns from high-performance small molecules, adapting them to polymer form to achieve both high mobility and reduced bandgap
3Ease of manufacture
If solution processing techniques are used for OPV manufacturing, then production cost decreases and scalability increases, but polymer solubility and processibility must be sufficient
Solution Approach 1:
The patent introduces specific substituent groups (R1-R8) at localized positions on the BBT unit to enhance solubility without compromising the core electronic properties, allowing solution processing while maintaining device performance
Solution Approach 2:
The invention modifies physical-chemical parameters of the polymer by varying substituent types and positions to optimize solubility in common organic solvents, enabling cost-effective solution processing techniques
4Use of energy by moving object
If alternating copolymer structures with donor and acceptor units are used, then bandgap is reduced for better solar absorption, but synthesis difficulty increases
Solution Approach 1:
The patent divides the polymer structure into distinct donor and BBT acceptor unit segments that can be synthesized separately and then coupled through established cross-coupling reactions, simplifying the overall synthesis of alternating copolymers
Solution Approach 2:
The invention employs standard cross-coupling reaction intermediaries and catalysts to facilitate the formation of alternating copolymer structures, making the synthesis process more accessible and scalable
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The compounds demonstrate high external quantum efficiencies, oxidative stability, and suitable morphology for organic electronic devices, particularly enhancing power conversion efficiency in photovoltaic cells.
Implementation Method 1
organic photovoltaic (OPV) cells... conjugated polymers have found use in OPVs as they allow devices to be manufactured by solution-processing techniques... the conjugated polymer serves as the main absorber of the solar energy in the bulk-heterojunction blend layer
Data Source
AI summary
The invention relates to novel compounds containing one or more benzo[1,2-d;4,5-d']bisthiazole-4,8-diyl ("BBT") units, to methods for their preparation and educts or intermediates used therein, to mixtures and formulations containing them, to the use of the compounds, mixtures and formulations as organic semiconductors in organic electronic (OE) devices, especially in organic photovoltaic (OPV) devices and organic photodetectors (OPD), and to OE, OPV and OPD devices comprising these compounds, mixtures or formulations.