Dual Interfacial Modifications by a Natural Organic Acid Enable High-Performance Perovskite Solar Cells with Lead...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells (PSCs) require effective interfacial engineering for improved performance and longevity.
• Modifying interfaces near the perovskite layer is crucial for charge transfer and device stability.

Purpose of the Study:

• To introduce a dual interfacial modification strategy using citric acid (CA) for PSCs.
• To enhance the efficiency and stability of PSCs through CA treatment of interfaces adjacent to the perovskite layer.

Main Methods:

• Depositing a CA thin layer on the SnO2 electron transport layer to protect the perovskite film.
• Post-treating the perovskite film with CA to passivate surface defects and improve interface contact.
• Utilizing the chelating properties of CA to suppress lead leakage.

Main Results:

• The CA treatment mitigated corrosive effects on the perovskite film and controlled its crystal growth.
• Surface passivation and defect reduction led to strengthened interface contact and facilitated charge transfer.
• Power conversion efficiency (PCE) of PSCs increased from 21.02% to 24.20%.

Conclusions:

• Dual interfacial modification with citric acid is a practical approach to enhance PSC performance and stability.
• CA treatment offers a method for creating more stable and efficient environmentally friendly PSCs.
• The study highlights the potential of natural organic acids in advancing solar cell technology.