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Brush-Like Tetrameric Acceptors Achieving over 20% Efficiency With Exceptional Stability and Mechanical Robustness
Yunpeng Wang1, Xuechun Yang1, Zhi Wang2
1Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, China.
Angewandte Chemie (International Ed. in English)
|February 5, 2026
Summary
Researchers developed a new synthetic method for high-molecular-weight acceptors, enhancing organic solar cell (OSC) efficiency, stability, and stretchability. This breakthrough addresses limitations in material accessibility for next-generation OSCs.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- High-molecular-weight acceptors are crucial for high-performance organic solar cells (OSCs).
- Limited synthetic accessibility hinders the large-scale application of these promising materials.
- Existing acceptors often face challenges with stability and mechanical robustness.
Purpose of the Study:
- To develop an efficient synthetic strategy for high-molecular-weight acceptors with controlled structures.
- To investigate the impact of molecular architecture and size on OSC performance and stability.
- To create intrinsically stretchable acceptors for advanced solar cell applications.
Main Methods:
- A "brush-like" synthetic strategy was employed to create novel acceptors (diYCl, teYCl, pYCl).
- Fabrication and characterization of quasiplanar heterojunction (Q-PHJ) OSCs using these acceptors.
- Evaluation of device efficiency, operational stability, and mechanical properties under strain.
Main Results:
- The new acceptors exhibit well-defined structures and enlarged molecular sizes, suppressing diffusion and enhancing thermodynamic stability.
- The teYCl acceptor achieved a power conversion efficiency (PCE) of 18.02% in D18/teYCl Q-PHJ OSCs with excellent operational durability (T80 > 5000 h at 65°C).
- Using teYCl as a coacceptor boosted PCE to 20.19% in bilayer Q-PHJ devices, while teYCl- and pYCl-based devices showed remarkable stretchability (maintaining 80% PCE at 31% and 40% strain, respectively).
Conclusions:
- The "brush-like" synthesis offers a practical route to high-molecular-weight acceptors for OSCs.
- Precisely controlled molecular design leads to improved efficiency, stability, and mechanical robustness.
- These findings pave the way for developing high-performance, stable, and stretchable organic solar cells.
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