DTPI-Based Organic Semiconductors for OPV Stability
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Solution Overview
Problem
Current organic semiconducting materials for organic electronic devices, such as OTFTs and OPVs, face limitations in device performance due to low thermal, photo, and electrical stability, along with modest charge carrier mobility and bandgap, which hinders their efficiency and scalability.
Innovation Solution
Development of compounds containing 1,3-dithiolo[4,5-d]phthalimide (DTPI) units as electron acceptors, which are incorporated into conjugated polymers to enhance charge carrier mobility, stability, and solubility, facilitating their use in organic electronic devices through solution processing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic semiconducting materials are used, then device fabrication is simple, but device performance is limited due to low charge carrier mobility and stability
Solution Approach 1:
The patent modifies the chemical structure of organic semiconducting materials by incorporating specific heterocyclic units (triazole, tetrazole, pyrimidine, pyridine) to change electronic parameters such as HOMO/LUMO levels and charge carrier mobility, thereby improving device performance while maintaining solution processability
Solution Approach 2:
The patent creates composite semiconducting materials by combining electron-donor units with electron-acceptor units containing heterocyclic rings, forming donor-acceptor copolymers that exhibit enhanced charge carrier mobility and stability compared to conventional materials
2Reliability
If low bandgap polymers are used in OPV cells, then power conversion efficiency is improved, but thermal and photo stability are reduced
Solution Approach 1:
The patent designs polymers with specific bandgap parameters by incorporating electron-acceptor units with heterocyclic rings, achieving low bandgap (2.0-3.0 eV) for efficient light harvesting while the rigid heterocyclic structure provides enhanced thermal and photo stability
Solution Approach 2:
The patent uses solution-processing techniques to fabricate OPV devices with low-cost materials, achieving high power conversion efficiency through optimized molecular design that balances light absorption and stability without requiring expensive vacuum deposition processes
3Reliability
If n-type OSC is used in OTFTs, then charge carrier mobility is enhanced, but oxidative doping occurs leading to reduced device performance
Solution Approach 1:
The patent raises the HOMO level of n-type OSC materials by incorporating electron-donor units with heterocyclic acceptor units, creating a higher ionization potential that makes the material more resistant to oxidative doping while maintaining high electron mobility through the conjugated backbone structure
4Ease of manufacture
If conventional OSC materials are used, then solution processing is feasible, but film uniformity and integrity are insufficient for large-scale production
Solution Approach 1:
The patent modifies the solubility parameters of OSC materials by incorporating heterocyclic units and adjusting side-chain structures, enabling excellent solution processability with common solvents while achieving superior film uniformity and integrity through optimized molecular packing and intermolecular interactions
Data Source
AI summary
The invention relates to novel compounds containing one or more 1,3-dithiolo[4,5-d]phthalimide (“DTPI”) units, to methods for their preparation 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.