Post-Treating Grain Boundaries and Surface Defects by Long-Chain Polymer for Highly Efficient and Stable Perovskite...

Area of Science:

• Materials Science
• Renewable Energy
• Chemical Engineering

Background:

• Perovskite solar cells (PSCs) face challenges from grain boundaries (GBs) and surface defects, limiting their photovoltaic performance.
• Passivation strategies are crucial for improving PSC efficiency and stability.

Purpose of the Study:

• To investigate the use of Nylon 11 (N11) as a post-treatment agent for FAPbI3 films in PSCs.
• To enhance the quality of perovskite films by passivating GBs and surface defects.
• To improve the power conversion efficiency (PCE) and humidity stability of PSCs.

Main Methods:

• Post-treatment of FAPbI3 films with Nylon 11 (N11), a long-chain polymer.
• Characterization of FAPbI3 film quality, including GBs and surface defect density.
• Fabrication and performance testing of PSCs under open-air conditions.
• Evaluation of device stability under 30% relative humidity (RH) for 1000 hours.

Main Results:

• N11 post-treatment resulted in FAPbI3 films with tight GBs and low surface defect density.
• The PCE of N11-treated PSCs increased from 21.89% to 23.54%.
• Unencapsulated N11-treated PSCs retained 89% of their initial PCE after 1000 hours of exposure to 30% RH.

Conclusions:

• Nylon 11 is an effective material for passivating defects in FAPbI3 films for PSCs.
• N11 post-treatment significantly boosts both the efficiency and humidity stability of PSCs.
• This approach offers a promising strategy for developing high-performance and durable perovskite solar cells.