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Halogen-Atom Engineering on Aromatic-Core in Tethered Small Molecule Acceptors for High-Performance Polymer Solar
Shanshan Jian1, Yu Zang1, Shixin Meng1
1State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|February 12, 2025
Summary
Halogen atom engineering on tethered small molecular acceptors (SMAs) improved polymer solar cell (PSC) stability and efficiency. Chlorine-based acceptors enhanced performance, achieving 18.72% power conversion efficiency and long-term stability.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Tethered small molecular acceptors (SMAs) are crucial for stable polymer solar cells (PSCs).
- Optimizing SMA chemical structures for enhanced photovoltaic efficiency and molecular aggregation is challenging.
- Fine-tuning molecular interactions is key to improving PSC performance.
Purpose of the Study:
- To investigate the impact of halogen-atom engineering on tethered SMA dimers.
- To modulate photovoltaic properties by introducing chlorine or bromine atoms.
- To enhance the efficiency and stability of polymer solar cells.
Main Methods:
- Designed and synthesized two tethered SMA dimers: DY-Cl (chlorine) and DY-Br (bromine).
- Blended SMAs with polymer donors to form active layers for PSCs.
- Evaluated photovoltaic properties, charge transport, morphology, and operational stability.
Main Results:
- DY-Cl demonstrated enhanced intermolecular interactions and charge transport compared to DY-Br.
- The chlorine-based acceptor optimized the active layer morphology.
- DY-Cl based PSCs achieved a power conversion efficiency of 18.72%.
- PSCs maintained over 80% of their initial efficiency after 1000 hours of operation.
Conclusions:
- Halogen-atom engineering is an effective strategy for tuning SMA properties.
- Chlorine substitution in tethered acceptors leads to improved PSC efficiency and stability.
- This approach offers a straightforward method for developing high-performance, stable PSCs.
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