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High-Performance Nonfused Ring Electron Acceptors with V-Shaped Side Chains.
Jingyi Li1, Zhenyu Zhang1, Guangliu Ran2
1Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|August 8, 2022
Summary
Researchers designed two isomeric nonfused ring electron acceptors to improve photovoltaic performance. Side chain engineering significantly enhanced power conversion efficiency in organic solar cells, demonstrating its importance for acceptor design.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Nonfullerene acceptors are crucial for organic solar cells.
- Understanding structure-property relationships is key to improving device performance.
- Simplified synthesis pathways are needed for efficient acceptor development.
Purpose of the Study:
- To design and synthesize novel nonfused ring electron acceptors.
- To investigate the impact of side chain engineering on molecular properties and photovoltaic performance.
- To establish a relationship between molecular structure and performance in organic solar cells.
Main Methods:
- Synthesis of two isomeric nonfused ring electron acceptors (o-TT-Cl and m-TT-Cl) via high-yield steps.
- Characterization of molecular properties, including solubility and aggregation behavior.
- Fabrication and testing of organic solar cells using the synthesized acceptors.
Main Results:
- o-TT-Cl with a V-shaped side chain exhibited superior solubility and ordered packing due to J-aggregation.
- Blend films of o-TT-Cl showed improved morphology and charge transport compared to m-TT-Cl.
- o-TT-Cl based devices achieved a power conversion efficiency of 12.84%, significantly outperforming m-TT-Cl based devices (6.54%).
Conclusions:
- Side chain engineering is a critical factor in optimizing nonfused ring electron acceptors.
- Molecular design, specifically side chain structure, directly influences aggregation, morphology, and charge transport.
- This study provides valuable insights for developing high-performance organic solar cells.