Interfacial Molecular Engineering With Insoluble Multifunctional Modifiers for Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Uniform crystallization in perovskite films is crucial for high photovoltaic performance.
• Asymmetric crystallization kinetics and interfacial defects hinder device efficiency.

Purpose of the Study:

• To develop an interfacial molecular engineering strategy for in situ passivation of the SnO2/perovskite buried interface.
• To improve perovskite film crystallization and reduce defects for enhanced solar cell performance.

Main Methods:

• Engineered an interfacial layer with electronegative sites at the SnO2/perovskite interface.
• Investigated the layer's stability and impact on perovskite nucleation and growth.
• Fabricated and characterized optimized perovskite solar cells.

Main Results:

• The passivation layer effectively passivated surface defects and regulated perovskite crystallization.
• The layer remained intact during perovskite precursor exposure, preserving optoelectronic properties.
• Optimized devices achieved a 21.7% power conversion efficiency, a 5% improvement over controls.

Conclusions:

• The developed interfacial passivation strategy significantly enhances perovskite solar cell performance and reproducibility.
• This approach offers a simple yet effective method for addressing buried-interface limitations in perovskite photovoltaics.