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A Buried Sulfonate Molecular Bridge for Synchronous Charge Transport and Defect Passivation in High-Performance
Leying Zha1, Weilu Ding2, Yalin Gao1,3
1Longzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, School of Energy Science and Technology, Henan University, Zhengzhou, 450000, People's Republic of China.
Nano-Micro Letters
|August 14, 2026
Summary
A novel bifunctional interlayer, 2-formylbenzenesulfonic acid sodium salt (2-FAS), enhances perovskite solar cell performance and stability by improving adhesion and passivating defects. This leads to higher efficiency and exceptional long-term durability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- The buried interface quality in perovskite solar cells is critical for charge transport and recombination.
- Poor self-assembled molecule (SAM) adhesion and perovskite interface defects limit device efficiency and stability.
Purpose of the Study:
- To develop a bifunctional interlayer for improved perovskite solar cell performance.
- To address challenges in SAM adhesion and perovskite substrate interface defects simultaneously.
Main Methods:
- Utilized 2-formylbenzenesulfonic acid sodium salt (2-FAS) as a bifunctional interlayer.
- Investigated π-π stacking interactions between 2-FAS and SAM for adhesion and hole transfer.
- Examined sulfonate group coordination with Pb2+ for crystallization regulation and defect passivation.
Main Results:
- Achieved a champion power conversion efficiency (PCE) of 26.21% with a fill factor of 86.15%.
- Demonstrated enhanced structural integrity through Na+ occupation of A-site vacancies, suppressing ion migration.
- Unencapsulated devices retained over 90% of initial PCE after 4500 hours of storage.
Conclusions:
- 2-FAS effectively bridges SAM and perovskite layers, enhancing adhesion and charge transfer.
- The interlayer passivates defects and improves perovskite structural stability, leading to high efficiency and longevity.
- This approach offers a promising strategy for developing stable and efficient perovskite solar cells.
