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Rational design of self-assembled monolayer composition for efficient perovskite/Si tandem solar cells
Min Sup Kim1, So Jeong Park1, Geon Pyo Hong1
1Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea. jykim.mse@snu.ac.kr.
Nanoscale
|March 12, 2026
Summary
Researchers developed a new interface strategy for perovskite/silicon tandem solar cells using mixed self-assembled monolayers (SAMs). This method enhances charge extraction, boosting single-junction perovskite solar cell efficiency to 19.72% and tandem cell efficiency to 28.02%.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- High-performance perovskite/silicon tandem solar cells require efficient charge extraction at the interface.
- Interfacial engineering is crucial for optimizing energy level alignment and minimizing recombination losses.
Purpose of the Study:
- To develop a universal strategy for designing self-assembled monolayer (SAM)-based interfacial layers in perovskite and tandem solar cells.
- To enhance charge extraction and passivation at the perovskite/SAM interface.
Main Methods:
- Utilized a co-adsorption strategy with mixed commercial self-assembled monolayers (SAMs), specifically MeO-4PACz and Br-4PACz.
- Investigated the effect of mixed SAMs on energy level alignment (HOMO shift) and defect passivation.
Main Results:
- Mixed SAMs, particularly those with electron-withdrawing groups, induced a larger dipole moment and a downward shift in the HOMO level.
- Achieved a 19.72% efficiency for the optimized single-junction wide-bandgap perovskite solar cell.
- Reached a 28.02% efficiency for the integrated perovskite/silicon tandem solar cell.
Conclusions:
- The co-adsorption strategy with mixed SAMs effectively promotes hole transport and passivates interfacial defects.
- This approach provides a versatile method for improving the performance of perovskite-based solar cells and tandem devices.
