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Buried Interface Toughening and Multi-Site Defect Passivation for Thermally Stable Wide-Bandgap Perovskite Solar
Tao Ning1, Ning Li1, Bingying Sun2
1School of Material Science and Engineering, University of Jinan, Jinan, Shandong 250022, P. R. China.
ACS Applied Materials & Interfaces
|March 12, 2026
Summary
A novel bridging molecule enhances wide-bandgap perovskite solar cell stability and efficiency by strengthening interfaces and passivating defects. This functional approach improves mechanical robustness and device performance under stress.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Wide-bandgap (WBG) perovskites are key for efficient perovskite/silicon tandem solar cells due to spectral matching.
- WBG perovskite devices suffer from poor mechanical stability caused by weak interfacial adhesion under operational stress.
Purpose of the Study:
- To improve the mechanical stability and efficiency of WBG perovskite solar cells.
- To introduce a functional bridging molecule for interface toughening and defect passivation.
Main Methods:
- Incorporation of 2,2'-bipyridine-5-carboxylic acid (BCA) at the perovskite-substrate buried interface.
- Utilizing BCA's pyridine and carboxyl groups for defect passivation and π-π interactions with self-assembled monolayers (SAMs).
Main Results:
- Enhanced interfacial shear strength from 0.95 to 2.05 MPa.
- Increased WBG perovskite solar cell efficiency from 20.30% to 21.83%.
- Improved thermal stability, retaining 80% efficiency after 560 h at 85 °C.
Conclusions:
- BCA effectively strengthens interfaces and passivates defects in WBG perovskite solar cells.
- The developed interface modification strategy leads to highly efficient and mechanically stable perovskite devices.
- This work offers insights for designing robust interface layers for advanced perovskite photovoltaics.
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