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Solvent-dripping modulated 3D/2D heterostructures for high-performance perovskite solar cells
Xiaoming Chang1, Randi Azmi2, Tinghuan Yang3
1KAUST Solar Center (KSC), Physical and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia.
Nature Communications
|January 25, 2025
Summary
Researchers developed a new method using a meta-amidinopyridine ligand to create ordered 2D perovskite layers on 3D perovskite films. This significantly enhances the efficiency and stability of perovskite solar cells (PSCs).
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Two-dimensional (2D) perovskite layers on three-dimensional (3D) perovskite films improve perovskite solar cell (PSC) performance by reducing recombination and ion migration.
- Randomly oriented 2D perovskite phases lead to energetic disorder, hindering charge extraction and limiting PSC efficiency and stability.
- Controlled interfacial engineering is crucial for advancing PSC technology.
Purpose of the Study:
- To develop a method for creating highly ordered 2D perovskite phases on 3D perovskite films.
- To reduce energetic disorder at the 2D/3D perovskite interface.
- To enhance the power conversion efficiency (PCE) and long-term stability of PSCs.
Main Methods:
- Introduction of a novel meta-amidinopyridine ligand.
- Implementation of a solvent post-dripping technique.
- Fabrication and characterization of PSCs with the engineered 2D/3D interface.
Main Results:
- Generation of a highly ordered, phase-pure 2D perovskite layer on the 3D perovskite surface.
- Reduced energetic disorder at the reconstructed 2D/3D perovskite interface.
- Achieved a maximum PCE of 26.05% (certified 25.44%) and maintained over 82% of initial PCE after 1000 hours of damp heat testing.
Conclusions:
- The meta-amidinopyridine ligand and solvent post-dripping method effectively create ordered 2D perovskite passivation layers.
- This approach significantly improves charge extraction and reduces interfacial recombination, leading to higher PSC performance.
- The engineered PSCs demonstrate enhanced practical durability, paving the way for more stable and efficient solar energy conversion.
