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Optimizing Branching Linkers in Dimerized Acceptors for Enhanced Efficiency and Stability in Organic Solar Cells
Yunpeng Wang1, Yiwu Zhu1, Hanjian Lai1
1Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China.
Optimizing linker structures in branch-connected dimerized acceptors enhances organic solar cell (OSC) performance. A novel dYTAT-C6-F acceptor achieved a record 18.08% power conversion efficiency (PCE) and improved stability.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- High-performing organic solar cells (OSCs) often utilize Y-series precursors for their conjugated π-backbones.
- Branch-connected dimerized acceptors offer potential for enhanced molecular packing and stability, crucial for high power conversion efficiency (PCE).
Purpose of the Study:
- To investigate the impact of different linker structures (conjugated vs. conjugation-break) in the branching direction of dimerized acceptors on molecular properties and OSC device performance.
- To optimize linker engineering for improved solubility, morphology, charge transport, and reduced recombination in OSCs.
Main Methods:
- Synthesis of three dimerized acceptors featuring varied linker strategies within the branching direction.
- Systematic evaluation of molecular properties, solubility, morphology, and charge transport characteristics.
- Fabrication and performance testing of organic solar cell devices incorporating the synthesized acceptors.
Main Results:
- The dYTAT-C6-F acceptor, incorporating a flexible conjugation-break linker, achieved a record PCE of 18.08% among similar structures.
- This optimized linker facilitated improved solubility and morphology, leading to enhanced charge generation and transport while suppressing recombination.
- The dYTAT-C6-F based OSC demonstrated a T80 lifetime of 1840 hours, indicating enhanced stability.
Conclusions:
- Conjugation breakages in linkers effectively tune molecular solubility, aggregation, and carrier mobility in dimerized acceptors.
- Optimizing linker length and structure in the branching direction is critical for maximizing OSC performance and stability.
- Engineering linkers presents a significant strategy for achieving high-performance organic solar cells.
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