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Highly Stable and Efficient Formamidinium-Based 2D Ruddlesden-Popper Perovskite Solar Cells via Lattice Manipulation
Fang Zeng1,2, Weiyu Kong2,3,4, Yuhang Liang1,5
1School of Physics, The University of Sydney, Sydney, NSW, 2006, Australia.
Advanced Materials (Deerfield Beach, Fla.)
|September 6, 2023
Summary
Spacer cation engineering in formamidinium (FA)-based 2D perovskites stabilizes the lattice. This approach, using selenourea (SENA) additives, enhances solar cell efficiency and stability, achieving a record 20.03% power conversion efficiency.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Physics
Background:
- Formamidinium (FA)-based 2D perovskites are promising for solar cells.
- Lattice strain and orientation issues in 2D perovskites limit efficiency and stability.
Purpose of the Study:
- To engineer FA-based 2D perovskite lattices for improved efficiency and stability.
- To mitigate microstrain and unfavorable orientations in 2D perovskite solar cells.
Main Methods:
- Spacer cation engineering to tune the perovskite lattice.
- Employing selenourea (SENA) additive to modulate crystallization kinetics.
- Controlling crystal growth for vertical quantum well orientation.
Main Results:
- Achieved a stable lattice with balanced distortion and relaxed microstrain.
- SENA additive inhibited disordered crystallization and promoted vertical orientation.
- Optimized devices reached 20.03% power conversion efficiency (PCE) and 19.30% certified steady-state efficiency.
- Devices showed <1% degradation after 1000h operation and excellent thermal/cycling stability.
Conclusions:
- Spacer cation engineering and SENA additive are effective strategies for stabilizing 2D perovskite solar cells.
- Controlled crystallization leads to reduced defects and enhanced charge separation.
- This work sets a new record for low-n 2D perovskite solar cells, demonstrating high efficiency and operational stability.
