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Benzimidazole-Fused A-D-A'-D-A Type Non-Fullerene Acceptors for Efficient Organic Solar Cells
Ting Li1,2, Jie Fang2, Dongdong Xia2
1College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang, People's Republic of China.
Researchers developed a new, general synthesis for benzimidazole-based non-fullerene acceptors (NFAs). Fluorinated NFAs significantly boosted organic solar cell efficiency to 19.48%.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Non-fullerene acceptors (NFAs) are crucial for high-performance organic solar cells.
- Benzimidazole (Im) cores offer attractive optoelectronic properties but require general synthetic routes.
Purpose of the Study:
- To develop a general synthetic protocol for benzimidazole-based NFAs.
- To explore the impact of varying side groups on NFA properties and device performance.
Main Methods:
- A typical approach for Im structures using o-benzoquinone, aldehyde, and ammonium acetate.
- Synthesis of three new Im-based acceptors with benzene, 4-fluorobenzene, and 3.5-difluorobenzene side groups.
- Fabrication and testing of organic solar cells using these NFAs.
Main Results:
- Successfully synthesized three new Im-based NFAs with tunable properties.
- Fluorinated NFAs demonstrated improved UV-vis absorption and energy levels.
- Organic solar cells utilizing fluorinated NFAs achieved a power conversion efficiency of 19.48%.
Conclusions:
- The study provides an effective protocol for synthesizing tunable Im-based NFAs.
- Fluorinated NFAs show great potential for advancing organic solar cell technology.
- This work contributes to the development of high-performance optoelectronic materials.
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