Enhanced coordination interaction with multi-site binding ligands for efficient and stable perovskite solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Conventional passivating ligands in perovskite solar cells have limitations.
• Single-site binding creates resistive barriers and hinders device stability.

Purpose of the Study:

• To develop a novel multi-anchoring ligand for improved perovskite solar cell performance.
• To enhance perovskite crystallinity, reduce defects, and boost moisture resistance.

Main Methods:

• Identification and synthesis of an antimony chloride-N,N-dimethyl selenourea complex, Sb(SU)2Cl3.
• Fabrication of perovskite solar cells using a two-step, air-processed method.

Main Results:

• Achieved a power conversion efficiency of 25.03% in air-processed perovskite solar cells.
• Demonstrated significantly enhanced moisture resistance and overall device stability.
• Unencapsulated cells showed extrapolated T80 lifetimes of 23,325 hours (dark storage), 5,004 hours (85 °C), and 5,209 hours (1-sun illumination).

Conclusions:

• Sb(SU)2Cl3 acts as an effective multi-anchoring ligand, improving perovskite solar cell characteristics.
• The developed cells exhibit remarkable stability and high efficiency, positioning them among the best reported.
• This work offers a promising pathway for developing highly stable and efficient perovskite solar cells under ambient conditions.